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    COLORADO
                 ASSIGNMENT         OBSERVED        ASSIGNED      C*
    1913         1 -    ?            14271             ?
    1914         1 -    ?            14117,            ?
                                 15264 - 19964
    1915         1 -    ?            18923,            ?
                                 20241 - 28953
    1916         1 -  12000,     12814 - 13617       35,000       57
             15001 -  33000,         33549
             38001 -  43000          46504
    1917         1 -  50000          67350           50,000       57
    1918         1 -    ?            89-948,           ?
                               101-516 - 101-523
    1919-20 TB   1 - 232-500        232-954         106,770*      34
    1920                            233-111
    1921         1 -    ?           176-997            ?
    1922         1 - 193-900        188-871         155,410*      28
    1923         1 - 187-000        191-622         167,300       30
    1924         1 - 240-800        223-645         197,050       11
                               301-701 - 302-001
    1925         1 - 274-500        265-760         237,800*       8
    1926         1 - 278-800        273-704         253,750*       8
    1927         1 - 308-150        307-232         263,750*       ?
    1928         1 -    ?           313-468            ?
    1929         1 -    ?           325-541            ?
    1930         1 -    ?           34-31-07           ?
    1931         1 - 389-000        385-961         313,300*       2

    C* = Number of counties exceeding blocks.    (1931 - Eagle & Kiowa)

    COUNTY ASSIGNMENTS  (1913-15, 1918, 1921, 1928-30 unknown)
    1916-17, 1919-20, 1922-26 in County Code Book, 1927 on file,
    1931 in Mountain Outline, Vol. 11, No. 1.
    1918 known blocks:  Denver 1 - 22-500, El Paso 25-001 - 35-000,
                        Pueblo 71-701 - 75-700.
    1930 known block:   Weld 13-70-01 - 15-70-00  (Delivered 8/28/1929)

    COUNTY ORDER 1919-31  (1921, 1928-30 unknown)
    1919-31 (Except 1923-24):  Denver, El Paso, Pueblo, Weld, followed
                               by remaining 59 counties alphabetically.
                               Dolores not assigned until 1922.
    1923-24:  Denver, El Paso, Pueblo, Weld, Larimer, followed by
              remaining 58 counties alphabetically.

    NON-PASSENGER BLOCKS
    Dealer:   1913    14301 - 15015
              1914    14301 - 15143
              1915    19009 - 20089
              1916    36001 - 37985
    Visitor:  1918   90-001 - 97-892

    ADDITIONAL NOTES
    1917:  49701 - 49750 not listed.
    1918-22:  #0 issued to Secretary of State.
    1919-31 blocks have gaps after them except:  1919-20 Sedgwick,
    1922-23 El Paso, 1924 Denver and Conejos, and 1927 Dolores,
    Hinsdale and Jackson.  Denver assigned an additional 10,000
    numbers in 1920.  Plates observed between blocks 1919-23 only.
    Registrations exceeding maximum space:
    1916       8,417                        1923   5,951  (12 counties)
    1917      16,966                        1924   2,709  (Denver)
    1919-20       70  (Prowers)             1925      81  (Arapahoe)

    TABS 1919-20   1919 has matching serial number; 1920 has none.
                   Tab insert letter indicates horsepower and/or fee:

    1919   HORSEPOWER     FEE               1920             FEE
      A       41+       $10.00                G   over $10.00 - $20.00
      B      21-40       $5.00                H   over  $5.00 - $10.00
      C       1-20       $2.50                I         $5.00
    (D,E,F = Truck)                           S   over $20.00


    1932-53 FORMATS      1-1 - 9-99-999     66, 67, 75, 90 = Sample.
                        10-1 - 63-9-999     Second hyphen dropped 1933.

    County codes on County Code page.
    1944, 1952 Tabs are also county coded.

    7-DIGIT PLATES
    HIGHEST NUMBER EXPECTED PER INITIAL-YEAR REGISTRATION FIGURES (*or
    observed number if higher):

               DENVER    ARAPAHOE   JEFFERSON   ADAMS          TOTAL
    1939                (10-9982)   11-10403*                   (404 P)
    1940     (1-94620)   10-10827   11-11019                  (1,848 P)
    1941      1-104850*  10-12122   11-12178                  (9,153 P)
    1942      1-104999*  10-12843   11-12363                 (10,218 P)
    1943-44   1-102401*  10-11411   11-11704*                 (5,519 S)
    1945     (1-85902)   10-11514*  11-10719*                 (2,235 S)
    1946     (1-95481)   10-12592   11-12410                  (5,004 S)
    1947      1-101893   10-13662   11-13932  (12-8660)       (9,490 P)
    1948      1-112950*  10-14562   11-16007*  12-10125      (23,648 P)
    1949      1-121097*  10-17041   11-18185   12-11586      (37,913 P)
    1950      1-137496*  10-19883   11-21401   12-13640      (62,424 P)
    1951-52   1-188533*  10-27308*  11-31712*  12-21456*    (139,013 P)
    1953      1-161161*  10-31367*  11-31269*  12-18777     (112,578 P)


    1954 FORMATS                       No C,E,G,I,L,M,O,Q,T,U,W,X used.
    Denver County:               1-1 -  1-9999
                                A1-1 - Z1-9999          126,000+  23.2%
                                1A-1 - 1Z-9999           18,000+   3.3%
    Counties  2 -  9:            2-1 -  2-9999           83,943=  15.5%
                                A2-1 -  Z2-999           78,420=  14.5%
                                2A-1 -  2Z-999           36,006=   6.6%
    Counties 10 - 63:           10-1 - 10-9999          145,143   26.8%
                               A10-1 - Z10-999           38,382    7.1%
                               10A-1 - 10Z-999           16,374    3.0%
    (226 prefixes)                                TOTAL 542,268*

    + counting 1000 - 9999 only
    = including Denver County

    1954-58:  County codes same as 1932-53 except Denver 1956-58.

    1955 FORMATS                                       No I,O,Q,T seen.
    Counties  1 -  9:        A/1   1 - W/1  9999        361,562   62.2%
    Counties 10 - 63:        A/10  1 - D/10 9999        219,576   37.8%
    (102 prefixes)                                TOTAL 581,138*

    1956 FORMATS                     No E,I,M,O,Q,T,W used except E/11.
    Denver:                      A:1 -    Z:9999        189,979   31.1%
    Counties  2 -  9:            2:1 -   2:99999        183,468   30.1%
    Counties 10 - 12:        A/10  1 - Z/10 9999        113,408   18.5%
    Counties 13 - 63:           13:1 -   13:9999        124,348   20.3%
    (90 prefixes)                                 TOTAL 611,203*

    1957 FORMATS
    Denver County:              1001 -      9999          8,999    1.4%
                               10000 -     99999         90,000   13.9%
                             100-000 -   299-999        102,300   15.8%
    Counties  2 -  9:         2-1001 -    2-9999         68,374   10.6%
                             2-10000 -   2-99999        123,935   19.1%
    Counties 10 - 13, 15:  A/10 1001 - F/10 9999        143,545   22.1%
    Counties 14, 16 - 63:    14-1001 -   14-9999        110,709   17.1%
    (75 prefixes)                                 TOTAL 647,862*

    1958 FORMATS                                         No I,O,Q used.
    Denver County:          A/A    1 -   N/R 999+       211,950   31.0%
    Counties 2 - 9:          2     1 -    2  999          7,992    1.2%
                            2/A    1 -   2/Z 999        147,500   21.5%
                            A/2    1 -   Z/2 999         44,544    6.5%
    Extra El Paso:          4/AA   1 -  4/DD 999=         3,415    0.5%
    Counties 10 - 63:       1/0    1 -   1/0 999         50,351    7.3%
                            10/A   1 -  10/Z 999        160,117   23.2%
                            A/10   1 -  Z/10 999         55,436    8.1%
    Extra Jefferson:        11/AA  1 - 11/FF 999=         5,019    0.7%
    (719 prefixes)                                TOTAL 686,324*
    + AA-AZ, BB-BZ, CC-CZ, etc.
    = AA, BB, CC, etc.

    HIGHEST NUMBER EXPECTED PER REGISTRATION FIGURES FOR THOSE COUNTIES
    USING LETTER SERIES (1954, 1956-57) OR ISSUING BEYOND "A" (1955)
    (*or observed number if higher):

    COUNTY          1954         1955          1956          1957
    Denver         1D-665*    W/1    18*       Z:9997*      202-299*
    Pueblo         2P-544     D/2  5214
    Weld           3A-222     C/3  4950
    El Paso        4Z-275     E/4  9198*
    Larimer        K6-973     B/6  8043
    Boulder         S7-83     C/7  1463
    Mesa           J8-441     B/8  8536
    Arapahoe      10N-591     D/10 4433     D/10 7061     E/10 6424*
    Jefferson     11P-798     D/11 9000*    E/11 2059     F/11 5950*
    Adams         S12-420     C/12 4921     D/12 4298*    D/12 8759*
    Logan                                                 B/13 1241*
    Morgan                                                A/15 9184

    1958 HIGHEST NUMBER EXPECTED PER REGISTRATION FIGURES (*or observed
    number if higher):
    N/R 162*   P/12 893   23/D  45*  34/A 508   45/A 542*  5/6  691
    S/2 641    13/H 201   24/D 802   35/A 848*  46/A 146*  57/A 200
    C/3 619    14/H 204*  25/B  94   36/A 466   47/B 300*  58/A 251*
    4/DD 418   15/H 382*  26/B 963*  37/A 924   4/8  795   5/9  915
    5/F 437*   16/B 311   27/B 896*  38/A 135*  49/B  99*  6/0  567*
    6/W 704    17/D 690   28/B 732   39/A 685   50/A  51*  6/1  999*
    C/7 771    18/F  16   29/B 339   40/B 554*  51/A 575   6/2  212
    A/8 555*   19/D 204*  30/C 145   41/C 918*  5/2  678*  6/3  143
    9/H 505    20/H   1*  31/C 501*  42/B 672   53/A 835*
    V/10 597*  21/F 338   32/F 890*  43/A 346*  5/4  995* (TOTAL
    11/FF 24*  22/B 497*  33/B 259*  44/A 694   5/5  400*  686,324*P)


    1959-74       AA-1 - ZN-9999      County codes on County Code page.

    Order same as 1932-58.  No I,O,Q used.  RR, DR-DW = Rental.

    (Highest number expected per initial-year registration figures for
     those counties exceeding first prefix - see Misc. 1)


    1975-76 CENTENNIAL BASE   Formats and county codes same as 1959-74.
    1975   Type 1:  Graphic, old dies                         (1,251 P)
    1975   Type 2:  Graphic, new dies           (Types 1-2 1,732,402 P)
    Aug.76 Type 3:  Non-graphic, old dies                    (73,398 P)
                                                    (TOTAL 1,831,834 P)

    Type 1:  ZA-116 - ZA-984, ZE-5 - ZE-37, ZH-21 - ZH-368, ZM-153
    Type 2:  AA-1 - XY-1148, ZD-651, ZE-588, ZF-120, ZG-9868, ZJ-1247,
             ZP-7
    Type 3: (44 counties verified, see below; also reissue PZ-77)

    1976 Sticker has 1932-58 county number prefix, with leading zero on
    #01 - 09.

    (1975-76 Centennial Base by County and Type - see Misc. 2)


    1977-2000 MOUNTAIN BASE      2-letter county codes same as 1959-76.
    1977    Undated   Type 1       AA-1 - ZN-9999
    Aug.78  "AUG 79"  Type 2    BU-2479 - YT-8856    (15 counties seen)
    Jan.81  "JAN 82"  Type 3    FH-7935 -
    Apr.82  "APR 83"  Type 1a   AAA-001 - WWJ-999
    1992              Type 4    ECE-999 - VXY-612
    7-1-92   "5 93"   Type 4a   AAA1000 - WVV9999

    Description of Types:
    Type 1 - Wide dies, aluminum, gray back
    Type 2 - Wide dies, steel, green back        (1,2,3,4,6,7,10,11,12,
    Type 3 - Wide dies, aluminum, green back         14,22,28,32,44,47)
    Type 4 - Thin dies, aluminum, gray back
            (6-figures center- or margin-justified)

    1982-2000 3-letter county codes on Misc. 3 page.
    No I,O,Q used.  I and O added 1993 and 1996, respectively, in 3rd
    position only, starting at 0001 when reached in sequence.
    Zero die changed with introduction of "O" in 1996.

    County names printed on all 1979, some 1978 and 1980 stickers.

    Discontinued 1/4/2000, but currently revalidated.  Some were still
    issued for a few more years whenever supplies of 2000-09 base run out.

    (1977-2000 Mountain Base by county and type - see Misc. 3)


    2000-17 NEW MOUNTAIN BASE                     No Q used until 2013.
    1-4-2000  "11 00"  First lot     001-AAA - 057-AKZ      (273,783 P)
                       Subsequent lots up to   999-ZZZ
    2013       "8 14" (Q all places) 001-AAQ - 999-ZZQ
    2015       "5 16"                QAA-001 - QZZ-999
    2016       "4 17" (Q 2-3rd pos.) AAQ-001 - ZZQ-999

    Adams first county of first lot.  Truck starts at ALA, ends at JJY.
    Light trucks issued passenger plates starting in mid-2003.


    OPTIONAL GRAPHIC BASES:  ($25 extra annual fee)

    1989-93 DESIGNER BASE        A1A-001 - Z9N-999       No I,O,Q used.
    1-3-89  "8 89"  Type 1:  Wide dies, white back
                    Type 2:  Wide dies, unpainted back
    Sep.91  "9 92"  Type 3:  Thin dies, unpainted back
                                                       (TOTAL 95,812 P)
    County codes in County Code Book.  (149 prefixes)
    Discontinued 7/1/1992, but currently revalidated.


    1993-2000 DENIM BASE         A1A1000 - Z9N9999         No O,Q used.
    7-1-92  "7 93"  Type 1:  Unpainted back
    1993    "3 94"  Type 2:  Painted back

    County codes are continuation of Designer Base.
    Prefixes containing I start at 0001.
    Discontinued 1/4/2000, but currently revalidated.


    2000-17 NEW DESIGNER BASE                     No Q used until 2013.
    1-4-2000  "11 00"            699-AWI - 311-AWU           (10,602 P)

    Motorcycle AVV, Collector Vehicle AXT.
    Subsequent assignments also issued.