Compiled by Ed Quillen
License Plates – March 2000 – Colorado Central Magazine
| County | 1930 Pop’n | Rank | 2-letter | 3-letter | 1998 Pop’n | Rank |
| Denver | 287,861 | 1 | AA-GN | AAA-DZZ | 499,055 | 2 |
| Pueblo | 66,038 | 2 | GP-HX | VEZ-VVC | 134,867 | 10 |
| Weld | 65,097 | 3 | HY-JW | WAA-WNK | 159,429 | 8 |
| El Paso | 49,570 | 4 | JX-LL | KAA-LZZ | 490,378 | 3 |
| Las Animas | 36,008 | 5 | LM-LT | UAA-UBK | 14,573 | 27 |
| Larimer | 33,137 | 6 | LU-MK | FHA-FZZ | 231,221 | 7 |
| Boulder | 32,456 | 7 | ML-NF | MAA-NZZ | 267,274 | 6 |
| Mesa | 25,908 | 8 | NH-NZ | UEJ-UNL | 112,891 | 11 |
| Otero | 24,390 | 9 | PA-PG | UXS-UZZ | 20,671 | 20 |
| Arapahoe | 22,647 | 10 | PH-RP | PAA-RZZ | 473,168 | 4 |
| Jefferson | 21,810 | 11 | RS-TD | GAA-JZZ | 501,591 | 1 |
| Adams | 20,245 | 12 | TE-UF | SAA-TZZ | 323,853 | 5 |
| Logan | 19,946 | 13 | UG-UN | UCB-UEH | 17,890 | 24 |
| Frémont | 18,896 | 14 | UP-UV | EPV-ETV | 43,904 | 12 |
| Morgan | 18,284 | 15 | UW-VD | UCA-UXR | 25,087 | 18 |
| Huerfano | 17,062 | 16 | VE-VF | EZF-EZW | 6,813 | 41 |
| Prowers | 14,762 | 17 | VG-VK | VDN-VEY | 13,729 | 29 |
| Delta | 14,204 | 18 | VL-VR | EFH-EHP | 26,619 | 17 |
| Yuma | 13,613 | 19 | VS-VU | WTL-WUR | 9,389 | 36 |
| La Plata | 12,975 | 20 | VV-WA | FDF-FGB | 40,413 | 13 |
| Montrose | 11,742 | 21 | WB-WF | USM-UUZ | 30,764 | 16 |
| Baca | 10,570 | 22 | WG-WH | EBE-EBW | 4,365 | 49 |
| Rio Grande | 9,953 | 23 | WJ-WL | VVW-VWZ | 11,453 | 34 |
| Garfield | 9,975 | 24 | WM-WR | ETW-EWM | 39,301 | 14 |
| Conejos | 9,803 | 25 | WS-WT | EDV-EEK | 7,972 | 39 |
| Kit Carson | 9,725 | 26 | WU-WV | WUZ-WVV | 7,313 | 40 |
| Washington | 9,591 | 27 | WW-WY | WST-WTK | 4,576 | 48 |
| Routt | 9,352 | 28 | WZ-XB | VXA-VYN | 17,514 | 25 |
| Bent | 9,134 | 29 | XC-XD | EBX-ECL | 5,497 | 46 |
| Alamosa | 8,602 | 30 | XE-XG | EAA-EBD | 14,448 | 28 |
| Chaffee | 8,126 | 31 | XH-XK | FAM-FCC | 15,075 | 26 |
| Montezuma | 7,798 | 32 | XL-XN | UPY-USL | 22,465 | 19 |
| Lincoln | 7,850 | 33 | XP-XR | UBL-UCA | 5,729 | 45 |
| Elbert | 6,580 | 34 | XS-XT | EPB-EPU | 18,600 | 23 |
| Saguache | 6,250 | 35 | XU-XV | VYP-VZA | 6,076 | 44 |
| Crowley | 5,934 | 36 | XW-XX | EET-EFA | 4,310 | 51 |
| Phillips | 5,797 | 37 | XY-XZ | VBB-VBR | 4,325 | 50 |
| Costilla | 5,779 | 38 | YA-YA | EEL-EES | 3,641 | 53 |
| Sedgwick | 5,580 | 39 | YB-YC | WNL-WNY | 2,547 | 56 |
| Gunnison | 5,527 | 40 | YD-YE | EYC-EZC | 12,456 | 33 |
| Lake | 4,899 | 41 | YF-YH | FCD-FDE | 6,391 | 42 |
| Moffat | 4,861 | 42 | YJ-YK | UNS-UPX | 12,535 | 32 |
| Teller | 4,141 | 43 | YL-YL | WRN-WSR | 20,606 | 21 |
| Eagle | 3,924 | 44 | YM-YN | EMB-EPA | 33,538 | 15 |
| Kiowa | 3,786 | 45 | YP-YP | WUS-WUY | 1,633 | 59 |
| Cheyenne | 3,723 | 46 | YR-YR | ECM-ECT | 2,346 | 57 |
| Douglas | 3,498 | 47 | YS-YT | EHW-EMA | 140,975 | 9 |
| Archuleta | 3,204 | 48 | YU-YU | FAA-FAL | 9,113 | 37 |
| Rio Blanco | 2,980 | 49 | YV-YW | VVD-VVV | 6,265 | 43 |
| San Miguel | 2,184 | 50 | YX-YX | VZF-VZR | 5,437 | 47 |
| Clear Creek | 2,155 | 51 | YY-YZ | ECU-EDU | 9,001 | 38 |
| Custer | 2,124 | 52 | ZA | EFB-EFG | 3,449 | 54 |
| Grand | 2,108 | 53 | ZB-ZC | EWZ-EYB | 10,050 | 35 |
| Park | 2,052 | 54 | ZD | VAH-VBA | 13,399 | 31 |
| San Juan | 1,935 | 55 | ZE | VZB-VZE | 530 | 63 |
| Ouray | 1,784 | 56 | ZF | VAA-VAG | 3,313 | 55 |
| Pitkin | 1,770 | 57 | ZG,ZP | VBS-VDM | 13,423 | 30 |
| Dolores | 1,412 | 58 | ZH | EHR-EHV | 1,822 | 58 |
| Jackson | 1,386 | 59 | ZJ | FGC-FGH | 1,535 | 60 |
| Gilpin | 1,212 | 60 | ZK | EWN-EWV | 4,188 | 52 |
| Summit | 987 | 61 | ZL,ZR | WNZ-WRM | 18,749 | 22 |
| Mineral | 640 | 62 | ZM | UNM-UNR | 694 | 62 |
| Hinsdale | 449 | 63 | ZN | EZD-EZE | 737 | 61 |
