Comprehensive Colorado county codes/allotments list

There exist many resources that display incomplete and/or inaccurate Colorado county code/allotment data. This webpage is designed to be a public record of Colorado license plate county information that pulls from all known sources. It should be used instead of the list found in the ALPCA archives, which is not complete and contains many errors.

Most of the information here comes from Colorado License Plates: The First 100 Years by Tom Boyd, George Sammeth, and Jim Hucks, which is an excellent and comprehensive book detailing the history, minutia, and oddities of Colorado license plates through 2013. In the list below, however, you will find a few corrections and additional pieces of information not found in the book that come from the independent research of Colin McGregor (me) and Bennett Sizer.

1916-1931

These codes only apply to passenger license plates -- if the plate has a letter in the serial, it's some sort of nonpassenger plate, and no county allotments for pre-1932 nonpassenger Colorado license plates are known.

Note that county allotments are not known definitively for the following years: 1913-1915, 1921, and 1928-1929. HOWEVER, on some of these years for which allotments are unknown, I have done some research using plate numbers for which I am absolutely certain about the county of issuance. While these formulas are by no means perfect, I have been able to approximate the following:

For 1921 Colorado plates, multiply the plate number by 1.3, find that respective allotment in the 1919-1920 list, and check the county to which it corresponds.
For 1929 Colorado plates, divide the plate number by 1.075, find that respective allotment in the 1927 list, and check the county to which it corresponds.

Additionally, a few 1929 allotments are known:

Boulder	182-001 - 183-000
Eagle	212-001 - 212-900
Hinsdale	227-001 - 227-100
Jefferson	232-001 - 238-000
Park	304-001 - 304-700
Weld	136-001 - 155-000
Yuma	328-501 - 332-000

COUNTY	1916	1917
DENVER	1-12000	1-15000
EL PASO	15001-17500	15001-18000
DELTA	17501-18000	36176-36600
LARIMER	18001-19700	19001-21200
ADAMS	19701-20000	18401-19000
WELD	20001-22300	21201-24600
BOULDER	22301-23750	24601-26600
CLEAR CREEK	23751-23800	34451-34600
DOUGLAS	23801-24000	31801-32100
ARAPAHOE	24001-24500	31201-31800
CHAFFEE	24501-24800	45976-46375
EAGLE	24801-24900	34801-34950
GRAND	24901-25000	37301-37400
ELBERT	25001-25200	32101-32500
GARFIELD	25201-25500	34951-35400
JEFFERSON	25501-25975	33701-34400
JACKSON	25976-26050	37201-37300
LAKE	26051-26200	34601-34800
LINCOLN	26201-26400	32501-33000
LOGAN	26401-26950	27701-28900
MESA	26951-27500	35476-36175
PHILLIPS	27501-27800	29151-29700
PITKIN	27801-27850	35401-35475
RIO BLANCO	27851-28000	36601-36750
MORGAN	28001-28550	26601-27700
GILPIN	28551-28570	34401-34450
YUMA	28571-28940	30301-31200
MOFFAT	28941-29020	36751-36900
ROUTT	29021-29095	36901-37200
SEDGWICK	29096-29245	28901-29150
WASHINGTON	29246-29515	29701-30300
TELLER	29516-29840	18001-18400
ARCHULETA	29841-29900	47941-48050
PARK	29901-29960	49751-49900
SUMMIT	29961-30000	49901-50000
PUEBLO	30001-32000	37401-39900
LAS ANIMAS	32001-32700	40301-41500
BENT	32701-33000	43001-43500
FREMONT	38001-38600	45176-45975
COSTILLA	38601-38700	48351-48500
HUERFANO	38701-39000	39901-40300
OTERO	39901-39600	41501-42700
RIO GRANDE	39601-39950	48901-49400
CUSTER	39951-39980	45101-45175
MINERAL	39981-40000	49401-49450
PROWERS	40001-40600	43501-44500
GUNNISON	40601-40780	46376-46600
KIT CARSON	40781-41000	33001-33500
MONTROSE	41001-41390	46601-47150
BACA	41391-41500	44801-45100
ALAMOSA	41501-41750	48501-48900
SAGUACHE	41751-42000	49451-49750
CROWLEY	42001-42200	42701-43000
LA PLATA	42201-42400	47641-47940
MONTEZUMA	42401-42500	47441-47640
OURAY	42501-42600	47151-47250
KIOWA	42601-42700	44501-44800
CONEJOS	42701-42830	48051-48350
SAN MIGUEL	42831-42900	47251-47400
CHEYENNE	42901-42975	33501-33700
HINSDALE	42976-42990	47426-47440
SAN JUAN	42992-43000	47401-47425
DOLORES	none	none

COUNTY	1918	1919-1920	1922	1923	1924
ADAMS	30-001 - 31-500	101-001 - 102-800	80-001 - 82-700	88-501 - 92-000	100-001 - 104-500
ALAMOSA	31-501 - 32-200	104-001 - 104-900	83-501 - 84-600	92-501 - 93-700	105-001 - 106-500
ARAPAHOE	32-201 - 33-200	106-001 - 107-300	85-501 - 88-500	94-001 - 97-000	107-001 - 111-200
ARCHULETA	33-201 - 33-400	110-001 - 110-300	89-001 - 89-250	97-501 - 97-800	111-501 - 112-000
BACA	33-401 - 34-100	111-001 - 111-900	89-501 - 90-750	98-001 - 99-400	112-501 - 114-500
BENT	34-101 - 35-200	113-001 - 114-300	91-501 - 93-300	99-601 - 101-500	115-001 - 117-600
BOULDER	35-201 - 39-200	116-001 - 121-000	94-001 - 100-800	101-801 - 108-600	118-001 - 125-800
CHAFFEE	39-201 - 39-800	125-001 - 125-800	101-501 - 102-350	109-001 - 110-000	127-001 - 128-500
CHEYENNE	39-801 - 40-200	127-001 - 127-500	102-701 - 103-400	110-201 - 111-000	129-001 - 130-400
CLEAR CREEK	40-201 - 40-500	128-001 - 128-400	103-701 - 103-900	111-201 - 111-500	137-001 - 131-500
CONEJOS	40-501 - 41-000	129-001 - 129-600	104-001 - 104-500	111-601 - 112-400	131-801 - 132-800
COSTILLA	41-001 - 41-300	131-001 - 131-400	104-801 - 105-200	112-601 - 113-050	132-801 - 133-500
CROWLEY	41-301 - 42-000	132-001 - 132-900	106-001 - 107-000	113-201 - 114-300	133-801 - 135-800
CUSTER	42-001 - 42-100	134-001 - 134-150	107-501 - 107-700	114-501 - 114-700	136-001 - 136-500
DELTA	42-101 - 43-200	135-001 - 136-500	108-001 - 109-700	114-801 - 116-700	136-801 - 139-500
DENVER	1 - 25-000	1 - 33-000	1 - 40-000	1 - 45-000	1 - 55-000
DOLORES	none	none	110-501 - 110-530	116-901 - 116-950	140-501 - 140-600
DOUGLAS	43-201 - 43-700	138-001 - 138-600	110-601 - 111-600	117-001 - 118-000	140-701 - 142-100
EAGLE	43-701 - 43-900	140-001 - 140 -300	112-201 - 112-550	118-301 - 118-650	142-401 - 143-000
ELBERT	43-901 - 44-600	141-001 - 141-900	112-801 - 113-900	118-801 - 120-100	143-101 - 145-100
EL PASO	25-001 - 30-000	50-001 - 57-000	50-001 - 60-000	50-001 - 60-000	55-001 - 65-600
FREMONT	44-601 - 45-800	143-001 - 145-000	114-501 - 117-200	120-501 - 123-500	145-501 - 149-700
GARFIELD	45-801 - 46-600	146-001 - 147-000	118-001 - 119-200	123-701 - 125-000	150-201 - 152-200
GILPIN	46-601 - 46-800	148-001 - 148-250	119-701 - 119-775	125-301 - 125-400	153-001 - 153-200
GRAND	46-801 - 47-000	149-001 - 149-250	119-901 - 120-150	125-501 - 125-850	153-501 - 154-000
GUNNISON	47-001 - 47-400	150-001 - 150-500	120-401 - 121-000	126-001 - 126-700	154-301 - 155-300
HINSDALE	47-401 - 47-500	152-001 - 152-200	121-301 - 121-330	126-901 - 126-950	155-401 - 155-500
HUERFANO	47-501 - 48-300	153-001 - 154-000	121-401 - 123-500	127-001 - 129-100	155-601 - 158-900
JACKSON	48-301 - 48-500	155-001 - 155-250	124-101 - 124-400	129-401 - 129-700	159-601 - 160-100
JEFFERSON	48-501 - 50-000	156-001 - 158-000	124-601 - 127-600	129-801 - 133-000	160-501 - 165-000
KIOWA	50-001 - 50-600	160-001 - 161-200	128-501 - 129-250	133-301 - 134-150	166-001 - 167-300
KIT CARSON	50-601 - 51-600	162-001 - 163-300	129-501 - 131-600	134-301 - 136-400	167-801 - 170-400
LAKE	51-601 - 52-000	164-001 - 164-500	132-101 - 132-400	136-601 - 136-950	170-801 - 171-400
LA PLATA	52-001 - 52-700	165-001 - 166-000	132-501 - 133-600	137-001 - 138-200	171-701 - 173-400
LARIMER	52-701 - 56-200	167-001 - 172-000	134-001 - 140-000	80-501 - 88-000	91-001 - 98-500
LAS ANIMAS	56-201 - 58-200	176-001 - 178-500	140-501 - 144-300	138-501 - 142-500	174-001 - 179-600
LINCOLN	58-201 - 59-000	180-001 - 181-000	145-001 - 146-400	142-901 - 144-500	181-001 - 183-300
LOGAN	59-001 - 61-000	182-001 - 184-500	147-001 - 151-600	144-801 - 149-400	184-001 - 188-600
MESA	61-001 - 62-500	186-001 - 187-800	152-501 - 155-300	149-701 - 152-700	189-501 - 194-000
MINERAL	62-501 - 62-600	189-001 - 189-150	156-001 - 156-075	153-101 - 153-200	194-101 - 194-300
MOFFAT	62-601 - 62-900	190-001 - 190-400	156-201 - 156-800	153-301 - 153-900	194-401 - 195-300
MONTEZUMA	62-901 - 63-300	191-001 - 191-500	157-001 - 157-600	154-001 - 154-650	195-801 - 196-700
MONTROSE	63-301 - 64-300	192-001 - 193-200	157-801 - 159-600	154-801 - 156-700	197-001 - 199-500
MORGAN	64-301 - 66-300	195-001 - 198-000	160-101 - 164-100	157-001 - 161-000	200-501 - 204-900
OTERO	66-301 - 68-500	200-001 - 202-600	165-001 - 169-500	161-201 - 165-700	206-001 - 211-000
OURAY	68-501 - 68-700	205-001 - 205-250	170-201 - 170-400	166-001 - 166-250	211-801 - 212-200
PARK	68-701 - 68-900	206-001 - 206-300	170-501 - 170-750	166-401 - 166-750	212-301 - 212-900
PHILLIPS	68-901 - 69-900	207-001 - 208-250	171-001 - 173-000	166-901 - 169-000	213-101 - 215-500
PITKIN	69-901 - 70-100	209-001 - 209-300	173-701 - 173-875	169-201 - 169-400	216-001 - 216-300
PROWERS	70-101 - 71-700	210-001 - 210-800	174-001 - 176-500	169-501 - 172-100	216-401 - 219-600
PUEBLO	71-701 - 75-700	70-001 - 75-000	60-001 - 66-500	60-001 - 67-500	66-001 - 75-100
RIO BLANCO	75-701 - 75-900	212-001 - 212-300	177-001 - 177-500	172-401 - 172-900	220-301 - 220-900
RIO GRANDE	75-901 - 76-900	213-001 - 214-200	177-701 - 179-450	173-001 - 174-750	221-501 - 223-700
ROUTT	76-901 - 77-400	216-001 - 216-600	180-001 - 180-900	175-001 - 176-000	224-001 - 225-500
SAGUACHE	77-401 - 77-800	217-001 - 217-500	181-201 - 182-000	176-301 - 177-150	225-901 - 227-100
SAN JUAN	77-801 - 77-900	218-001 - 218-150	182-401 - 182-500	177-401 - 177-500	227-601 - 227-750
SAN MIGUEL	77-901 - 78-100	219-001 - 219-250	186-601 - 182-925	177-601 - 177-950	227-801 - 228-300
SEDGWICK	78-101 - 78-600	220-001 - 222-000	183-101 - 184-100	178-101 - 179-200	228-801 - 230-300
SUMMIT	78-601 - 78-700	222-001 - 222-220	185-601 - 185-700	179-501 - 179-650	231-001 - 231-300
TELLER	78-701 - 79-300	223-001 - 223-750	185-801 - 186-300	179-801 - 180-400	231-601 - 232-800
WASHINGTON	79-301 - 80-000	226-001 - 227-700	186-501 - 189-500	180-601 - 183-600	233-001 - 236-200
WELD	80-001 - 87-800	80-001 - 88-000	67-501 - 79-000	68-301 - 79-800	77-001 - 89-600
YUMA	87-801 -	230-001 - 232-500	190-201 - 193-900	184-001 - 187-000	237-301 - 240-800

COUNTY	1925	1926	1927	1930	1931
ADAMS	111-501 - 116-500	118-001 - 124-000	150-001 - 157-000	15-80-01 - 16-50-00	175-001 - 182-000
ALAMOSA	117-001 - 118-500	124-501 - 126-500	158-001 - 159-800	16-60-01 - 16-80-00	185-001 - 187-500
ARAPAHOE	119-101 - 123-600	126-801 - 131-800	160-301 - 166-300	16-85-01 - 17-60-00	190-001 - 197-700
ARCHULETA	124-101 - 124-500	132-301 - 132-700	167-301 - 167-800	17-65-01 - 17-70-01	200-001 - 200-600
BACA	124-701 - 126-700	132-901 - 135-100	167-901 - 169-900	17-75-01 - 18-00-00	201-001 - 204-000
BENT	127-201 - 129-300	135-401 - 137-700	170-001 - 173-300	18-05-01 - 18-30-00	205-001 - 207-500
BOULDER	129-801 - 138-800	138-001 - 147-500	173-501 - 184-000	18-35-01 - 19-36-00	208-001 - 220-550
CHAFFEE	139-801 - 141-400	148-001 - 149-800	185-001 - 186-500	19-45-01 - 19-70-00	221-001 - 223-200
CHEYENNE	141-901 - 143-300	150-101 - 151-600	186-801 - 188-000	19-75-01 - 19-86-00	224-001 - 225-100
CLEAR CREEK	143-601 - 144-200	151-901 - 152-600	188-201 - 188-800	19-90-01 - 19-98-00	226-001 - 226-800
CONEJOS	144-401 - 145-600	152-801 - 154-100	188-901 - 190-200	20-00-01 - 20-17-00	227-001 - 228-700
COSTILLA	145-901 - 146-700	154-301 - 155-200	190-401 - 191-000	20-20-01 - 20-30-00	229-001 - 230-000
CROWLEY	147-001 - 149-000	155-401 - 157-600	191-101 - 192-500	20-35-01 - 20-52-00	231-001 - 232-800
CUSTER	149-501 - 150-100	157-901 - 158-600	192-701 - 193-300	20-55-01 - 20-63-00	233-001 - 233-800
DELTA	150-401 - 153-900	158-801 - 162-300	193-351 - 196-850	20-65-01 - 21-05-00	234-001 - 238-600
DENVER	1 - 65-000	1 - 70-000	1 - 75-000	1 - 8-50-00	1 - 90-000
DOLORES	154-401 - 154-550	162-801 - 162-950	197-251 - 197-400	21-10-01 - 21-14-00	239-001 - 239-400
DOUGLAS	154-701 - 156-200	163-101 - 164-700	197-401 - 198-600	21-15-01 - 21-30-00	240-001 - 241-600
EAGLE	156-701 - 157-400	164-901 - 165-600	198-801 - 199-500	21-35-01 - 21-44-00	242-001 - 243-000
ELBERT	157-701 - 150-900	165-801 - 168-000	199-601 - 201-400	21-45-01 - 21-65-00	244-001 - 246-200
EL PASO	70-001 - 82-000	75-001 - 88-000	100-001 - 114-000	10-00-01 - 11-70-00	100-001 - 117-000
FREMONT	160-401 - 165-200	168-301 - 173-300	201-601 - 206-800	21-70-01 - 22-23-00	247-001 - 252-500
GARFIELD	165-701 - 167-900	173-801 - 176-000	207-201 - 208-900	22-30-01 - 22-55-00	254-001 - 256-600
GILPIN	168-401 - 168-650	176-301 - 176-550	209-201 - 209-450	22-60-01 - 22-64-00	257-001 - 257-600
GRAND	168-801 - 169-400	176-701 - 177-400	209-501 - 210-200	22-65-01 - 22-73-00	258-001 - 258-850
GUNNISON	169-701 - 170-900	177-601 - 178-900	210-251 - 211-350	22-75-01 - 22-88-00	259-001 - 260-350
HINSDALE	171-401 - 171-550	179-101 - 179-250	211-401 - 211-500	22-90-01 - 22-92-00	261-001 - 261-100
HUERFANO	171-701 - 175-300	179-401 - 183-100	211-501 - 214-800	22-95-01 - 22-33-00	262-001 - 265-800
JACKSON	175-801 - 176-400	183-401 - 184-000	215-201 - 215-700	23-35-01 - 23-41-00	266-001 - 266-600
JEFFERSON	176-701 - 182-200	184-201 - 189-900	215-701 - 222-000	23-45-01 - 24-15-00	267-001 - 275-000
KIOWA	183-001 - 184-500	190-401 - 191-900	223-001 - 224-200	24-25-01 - 24-36-00	276-001 - 277-100
KIT CARSON	185-001 - 188-000	192-101 - 195-100	224-401 - 227-200	24-40-01 - 24-67-00	278-001 - 281-000
LAKE	188-501 - 189-200	195-401 - 196-200	227-301 - 228-000	24-70-01 - 24-81-00	282-001 - 283-100
LA PLATA	189-501 - 191-400	196-401 - 198-400	228-051 - 230-050	24-85-01 - 25-13-00	284-001 - 287-000
LARIMER	191-901 - 200-900	198-701 - 208-200	230-201 - 242-200	25-15-01 - 26-40-00	288-001 - 299-500
LAS ANIMAS	201-901 - 208-400	208-701 - 215-700	243-201 - 249-700	26-40-01 - 27-20-00	300-001 - 307-850
LINCOLN	209-401 - 211-900	216-201 - 218-700	250-201 - 252-200	27-25-01 - 27-47-00	308-001 - 310-500
LOGAN	212-401 - 217-000	219-001 - 223-800	252-401 - 257-600	27-50-01 - 28-07-00	311-001 - 317-500
MESA	217-801 - 222-800	224-201 - 229-500	258-201 - 264-200	28-07-01 - 28-80-00	318-001 - 325-500
MINERAL	223-801 - 224-000	230-001 - 230-200	265-201 - 265-350	28-80-01 - 28-82-00	326-001 - 326-250
MOFFAT	224-201 - 225-300	230-401 - 231-500	265-401 - 266-400	28-85-01 - 28-98-00	327-001 - 328-500
MONTEZUMA	225-601 - 226-800	231-701 - 232-900	266-501 - 267-700	29-00-01 - 29-17-00	329-001 - 331-000
MONTROSE	227-101 - 229-600	233-101 - 235-600	267-751 - 270-250	29-20-01 - 29-50-00	332-001 - 335-000
MORGAN	230-101 - 234-600	235-901 - 240-600	270-501 - 275-500	29-55-01 - 30-11-00	336-001 - 342-000
OTERO	235-601 - 241-100	241-101 - 246-900	276-201 - 282-200	30-15-01 - 30-77-00	343-001 - 349-500
OURAY	242-101 - 242-600	247-501 - 248-000	282-701 - 283-000	30-80-01 - 30-86-00	350-001 - 340-450
PARK	242-901 - 243-700	248-201 - 249-100	283-051 - 283-650	30-90-01 - 30-97-00	351-001 - 351-700
PHILLIPS	244-001 - 246-600	249-301 - 252-100	283-701 - 286-000	31-00-01 - 31-22-00	352-001 - 354-500
PITKIN	247-101 - 247-450	252-401 - 252-800	286-151 - 286-450	31-25-01 - 31-29-00	355-001 - 355-400
PROWERS	247-701 - 251-300	253-001 - 256-800	286-501 - 290-000	31-30-01 - 31-22-00	356-001 - 361-000
PUEBLO	83-501 - 94-500	89-001 - 101-000	115-001 - 129-001	11-90-01 - 13-50-00	125-001 - 142-000
RIO BLANCO	252-101 - 252-800	257-201 - 258-000	290-501 - 291-100	31-70-01 - 31-78-00	362-001 - 362-800
RIO GRANDE	253-101 - 255-600	258-201 - 260-800	291-151 - 293-650	31-80-01 - 32-07-00	363-001 - 365-800
ROUTT	256-101 - 257-900	261-101 - 263-000	293-801 - 295-600	32-10-01 - 32-33-00	366-001 - 368-300
SAGUACHE	258-401 - 259-900	263-301 - 264-900	295-651 - 296-650	32-35-01 - 32-49-00	369-001 - 371-000
SAN JUAN	260-401 - 260-600	265-101 - 265-300	296-701 - 296-850	32-50-01 - 32-53-00	372-001 - 372-300
SAN MIGUEL	260-901 - 261-500	265-501 - 266-200	296-901 - 297-500	32-55-01 - 32-63-00	373-001 - 373-800
SEDGWICK	261-801 - 263-400	266-401 - 268-100	297-551 - 299-050	32-65-01 - 32-86-00	374-001 - 378-100
SUMMIT	263-901 - 264-300	268-301 - 268-800	299-201 - 299-500	32-90-01 - 32-95-00	379-001 - 379-400
TELLER	264-601 - 266-000	269-001 - 270-500	299-551 - 300-750	33-00-01 - 33-12-00	380-001 - 381-250
WASHINGTON	266-501 - 270-000	270-701 - 274-200	300-901 - 303-900	33-15-01 - 33-38-00	382-001 - 384-750
WELD	96-001 - 110-000	102-001 - 117-000	130-001 - 148-000	13-70-01 - 15-70-00	150-001 - 170-000
YUMA	270-501 - 274-500	274-601 - 278-800	304-101 - 308-150	33-40-01 - 33-75-00	385-001 - 389-000

1932-2000

NOTE: Counties were assigned blocks of letters, but many counties never used their full assignment; others exhausted theirs and
borrowed from other series. The table below reflects actual use and not initial assignment.

1932-58	1959-82	1982-92	1992-2000	County Name
1	AA-CV	AAA-BMJ	AAA-ADN	DENVER
2	GP-HD	VEZ-VPA	VEZ-VFN	PUEBLO
3	HY-JM	WAA-WME	WAA-WAY	WELD
4	JX-LL, FR-FT, FV	KAA-LGR	KAA-KCL	EL PASO
5	LM-LN	UAA-UAV	UAA-UAB	LAS ANIMAS
6	LU-MK, FX-FY (MC '76 only)	FHA-FXT	FHA-FHY	LARIMER
7	ML-NF, FH-FP	MAA-MSZ	MAA-MBF	BOULDER
8	NG-NT (NG '59 only, NU/NW cycle only)	UEJ-ULV	UEJ-UFG	MESA
9	PA-PC	UXS-UYW	UXS-UXU	OTERO
10	PH-RP, FA-FG	PAA-RHD	PAA-PCF	ARAPAHOE
11	RS-TD, HG-HW	GAA-HKU	GAA-GCF	JEFFERSON
12	TE-UF, GA-GG	SAA-SZF	SAA-SBM	ADAMS
13	UG-UJ	UCB-UDE	UCB-UCC	LOGAN
14	UP-UT	EPV-ESU	EPV-EPZ	FREMONT
15	UW-UY	UVA-UWJ	UVA-UVD	MORGAN
16	VE	EZF-EZT	EZF	HUERFANO
17	VG-VH	VDN-VEJ	VDN-VDO	PROWERS
18	VL-VN	EFH-EGZ	EFH-EFI	DELTA
19	VS-VT	WTL-WTZ	WTL	YUMA
20	VV-VY	FDF-FFL	FDF-FDJ	LA PLATA
21	WB-WD	USM-UUD	USM-USO	MONTROSE
22	WG	EBE-EBK	EBE	BACA
23	WJ-WK	VVW-VWS	VVW-VVX	RIO GRANDE
24	WM-WR	ETW-EWB	ETW-EUA	GARFIELD
25	WS	EDV-EED	EDV	CONEJOS
26	WU (WV '59 only)	WUZ-WVJ	WUZ	KIT CARSON
27	WW	WST-WTA	WST	WASHINGTON
28	WZ-XA (XB cycles only)	VXA-VXY	VXA-VXC	ROUTT
29	XC	EBX-ECF	EBX	BENT
30	XE-XF	EAA-EAT	EAA-EAB	ALAMOSA
31	XH-XJ	FAM-FBP	FAM-FAN	CHAFFEE
32	XL-XM	UPY-USE	UPY-URA	MONTEZUMA
33	XP	UBL-UBU	UBL	LINCOLN
34	XS	EPB-EPU, DKA-DKC	EPB-EPC	ELBERT
35	XU	VYP-VYX	VYP	SAGUACHE
36	XW	EET-EEZ	EET	CROWLEY
37	XY	VBB-VBG	VBB	PHILLIPS
38	YA	EEL-EES	EEL	COSTILLA
39	YB	WNL-WNR	WNL	SEDGWICK
40	YD-YE	EYC-EYU	EYC-EYD	GUNNISON
41	YF-YG	FCD-FCV	FCD-FCE	LAKE
42	YJ-YK	UNS-UPG	UNS-UNT	MOFFAT
43	YL	WRN-WSS, VZS-VZV	WRN-WRS	TELLER
44	YM-YN, ZT	EMB-EPA	EMB-EMI	EAGLE
45	YP	WUS-WUU	WUS	KIOWA
46	YR	ECM-ECR	ECM-ECT	CHEYENNE
47	YS-YT, GM	EHW-EMA, FGJ-FGZ VZZ, WVW-WWF, DAA-DAU	EHW-EIG	DOUGLAS
48	YU	FAA-FAL	FAA-FAB	ARCHULETA
49	YV	VVE-VVP	VVE	RIO BLANCO
50	YX	VZF-VZM	VZF	SAN MIGUEL
51	YY-YZ	ECU-EDP	ECU-ECV	CLEAR CREEK
52	ZA	EFB-EFE	EFB	CUSTER
53	ZB-ZC	EWZ-EXV	EWZ-EXA	GRAND
54	ZD	VAH-VBA, EWW, EZX-EZZ, VZX-VZY, WWG-WWJ	VAH-VAI	PARK
55	ZE	VZB-VZC	VZB	SAN JUAN
56	ZF	VAA-VAE	VAA	OURAY
57	ZG, ZP	VBS-VCY	VBS-VBT	PITKIN
58	ZH	EHR-EHT	EHR	DOLORES
59	ZJ	FGC-FGE	FGC	JACKSON
60	ZK	EWN-EWV	EWN	GILPIN
61	ZL, ZR	WNZ-WRJ	WNZ-WPC	SUMMIT
62	ZM	UNM-UNN	UNM	MINERAL
63	ZN	EZD-EZE	EZD	HINSDALE

1970-2000 Anomalies

Rental car series (Denver):

AR (1973-1974)
DR (1974-1976)
DR-DU, DW (1977-1982)

Rental car series (outside Denver):

RR (1972-1982)

Rental car series (all counties):

ZAA-ZTV (1982-1992)
ZAA-ZAJ (1992-1995)

Note: some Z-series plates were also issued as overflow allotments, but no specifics are known

BHM was used on unmarked police cars on 1982 and 1992 baseplates

EHH on the 1992 base was issued in four counties: Denver, Eagle, Garfield, and Logan

Known 1982 truck overflow codes:

RR: Cheyenne County farm trucks
ZP: Kiowa County farm trucks
ZT: Costilla County farm trucks
ZV: Elbert County farm trucks
ZW: Montezuma County farm trucks
ZZ: Park County standard trucks

1982-Base Motorcycle and Trailer Codes/Allotments

Note 1: 1992-base trailer plates use the same allotments as below but with a leading 0, 1, or 2 after the letter (e.g. the first 1992-base trailer plate from Grand County would have been F030001. When this allotment ran out, they'd start again at F130001).

Note 2: These are the trailer series' initial allotments. Some counties exceeded these before 1992 and were given extra plates from other counties' series. The details of these overflow series are not available, though it is known that Larimer County issued trailer plates in the C30001+ series, and Park County was issued P68001 - P70000.

COUNTY	MOTORCYCLES	TRAILERS
ADAMS	TE-UF, DA-DS	A00001 - A99999
ALAMOSA	XE-XG	B00001 - B07000
ARAPAHOE	PG-RR, DT-DZ	B07001 - B80000
ARCHULETA	YU	B80001 - B83000
BACA	WG-WH	B83001 - B88500
BENT	XC	B88501 - B91500
BOULDER	ML-NF, CT-CZ, FL-FZ	M 00,001-55,000
CHAFFEE	XH-XK	B91501 - B99999
CHEYENNE	YR	C 00,001-03,000
CLEAR CREEK	YY-YZ	C 03,001-07,000
CONEJOS	WS-WT	C 07,001-11,000
COSTILLA	YA	C 11,001-12,000
CROWLEY	XW	C 12,001-14,000
CUSTER	ZA	C 14,001-16,000
DELTA	VL-VR	C 16,001-30,000
DENVER	AA-CN	D 00,001-80,000
DOLORES	ZH	D 80,001-82,000
DOUGLAS	YS-YT, CP-CS	D 82,001-99,999
EAGLE	YM-YN, XX-XY	E 80,001-90,000
ELBERT	XS-XT	E 90,001-99,999
EL PASO	JX-LL, GA-GN	E 00,001-80,000
FREMONT	UP-UW	F 00,001-15,000
GARFIELD	WM-WR	F 15,001-28,000
GILPIN	ZK	F 28,001-30,000
GRAND	ZB-ZC	F 30,001-38,000
GUNNISON	YD-YE	F 38,001-44,000
HINSDALE	ZP	F 44,001-45,000
HUERFANO	VE	F 45,001-48,000
JACKSON	ZJ	F 48,001-51,000
JEFFERSON	RS-TD, EA-FK	J 00,001-99,999
KIOWA	YP	K 00,001-02,000
KIT CARSON	WU-WV	K 02,001-08,000
LAKE	YF-YG	L 74,001-78,000
LA PLATA	VV-WA	L 60,001-74,000
LARIMER	LR-MK	L 00,001-60,000
LAS ANIMAS	LM-LP	L 78,001-82,500
LINCOLN	XP	L 82,501-86,500
LOGAN	UG-UL	L 86,501-99,999
MESA	NH-NZ	M 55,001-99,999
MINERAL	ZR	K 08,001-08,100
MOFFATT	YJ-YK	K 08,101-17,000
MONTEZUMA	XL-XN	K 17,001-30,000
MONTROSE	WB-WF	K 30,001-47,000
MORGAN	UX-VD	K 47,001-59,000
OTERO	PA-PF	K 59,001-69,000
OURAY	ZF	K 69,001-70,500
PARK	ZD	P 50,001-54,000
PHILLIPS	XZ	P 54,001-57,500
PITKIN	ZG, UM-UN	P 54,001-57,500
PROWERS	VG-VK	P 62,001-68,000
PUEBLO	GP-HN	P 00,001-50,000
RIO BLANCO	YV-YW	R 00,001-06,000
RIO GRANDE	WJ-WL	R 06,001-13,000
ROUTT	WZ-XB	R 13,001-20,000
SAGUACHE	XV	S 05,001-08,500
SAN JUAN	ZE	S 08,501-09,000
SAN MIGUEL	YX	S 09,001-11,000
SEDGWICK	YB-YC	S 11,001-13,000
SUMMIT	ZL-ZN	S 00,001-05,000
TELLER	YL, XY	T 00,001-05,000
WASHINGTON	WW-WY	W 50,001-55,000
WELD	HY-JW	W 00,001-50,000
YUMA	VS-VU	Y 00,001-07,000

COLORADO DESIGNER & DENIM CAR PLATES: 1989-2000

Unless otherwise noted, the standard first-series 1977 code was used with a "1" in the middle (e.g. Huerfano, VE, would become V1E).

COUNTY	DESIGNER ISSUE 1989-92	DENIM ISSUE 1992-95
ADAMS	G1A, G2A, G3A, G4A, G4B, G4C, G4D, G4E, G4F	G1A, G1B, G1C, G1D, G1E, G4G
ARAPAHOE	F1A, F2A, F3A, F4A, F5A, F6A, F6B, F6C, F6D, F6E, F6F, F6G, F6H, F6J, F6K, F6L, F6M	F1A, F1B, F1C, F1D, F1E, F1F, F6P
BOULDER	F1H, F1J, F1K, F1L, F1M, F1N, F1P, F1S, F1T	F1H, F1I, F1J, F1K, F1U
DENVER	A1A, A2A, A3A, A4A, A5A, A5B, A5C, A5D, A5E, A5F, A5G, A5H	A1A, A1B, A1C, A1C, A1D, A1E, A1F, A1G, A5J
DOUGLAS	G1M, G1N, G2N, G2P	G1M, G1N, G2P, Y1S
EAGLE	Y1M, Y1N	Y1M, Y1N
EL PASO	J1X, J2X, J3X, J4X, J5X, J6X, J6Y, J6Z	J1X, J1Y, J1Z, K1A, J2A, J2B
JEFFERSON	H1G, H2G, H3G, H4G, H5G, H6G, H7G, H8G, H8H, H8J, H8K, H8L, H8M, H8N, H8P, H8R, H8S, H8T	H1G, H1H, H1I, H1J, H1K, H1L, H8X
LARIMER	L1U, L1V, L1W, L1X, L1Y, L1Z, L2A	L1U, L1V, L1W, L2A
MESA	N1H, N1J, N1K	N1H, N1I, N1L
PROWERS	V1G	V1G, V1D
PUEBLO	G1P, G1R, G1S	G2O, G1P, G1S
SUMMIT	Z1L, Z2L	Z1L
WELD	H1Y, H2Y, H1Z, H2Z	H1Y, H1Z, H2Z

COUNTY CODE SUFFIXES FOR DESIGNER TRUCK PLATES

1989 format: 1234-[suffix]; 1992 format: 12345[suffix]

COUNTY NAME	SUFFIX CODE	COUNTY NAME	SUFFIX CODE	COUNTY NAME	SUFFIX CODE
DENVER	A1	ADAMS	C1	ARAPAHOE	D1
EL PASO	F1	JEFFERSON	G1	WELD	H1
ALAMOSA	J1	ARCHULETA	J2	BACA	J3
BENT	J4	BOULDER	J5	CHAFFEE	K1
CHEYENNE	K2	CLEAR CREEK	K3	CONEJOS	K5
COSTILLA	K6	CROWLEY	K7	CUSTER	K8
DELTA	K9	DOLORES	L1	DOUGLAS	L2
EAGLE	L5	ELBERT	L9	FREMONT	M1
GARFIELD	M2	GILPIN	M3	GRAND	M4
GUNNISON	M5	HINSDALE	M6	HUERFANO	M7
JACKSON	M8	KIOWA	M9	KIT CARSON	N1
LAKE	N2	LA PLATA	N3	LARIMER	N4
LAS ANIMAS	P1	LINCOLN	P2	LOGAN	P3
MESA	P4	MINERAL	P8	MOFFAT	P9
MONTEZUMA	R1	MONTROSE	R2	MORGAN	R3
OTERO	R4	OURAY	R5	PARK	R6
PHILLIPS	R7	PITKIN	R8	PROWERS	S1
PUEBLO	S2	RIO BLANCO	S4	RIO GRANDE	S5
ROUTT	S6	SAGUACHE	S7	SAN JUAN	S8
SAN MIGUEL	S9	SEDGWICK	T1	SUMMIT	T2
TELLER	T5	WASHINGTON	T6	YUMA	T7