 | County DETAILS |
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> United States > Colorado > CO Counties > Jefferson
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| Website | https://www.jeffco.us/ |
| Established | November 01, 1861 |
| Disbanded | Still Active |
| Last Modified | BrentinCO August 17, 2019 06:56pm |
| Description | Stretched along the foothills of the Rocky Mountains, Jefferson County, CO is a thriving suburban, business, industrial, recreational and residential community. The county, formally organized in 1861 by the Colorado Territorial Legislature, takes the name of Thomas Jefferson, the third president of the United States. |
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November 15, 2001 -
JEFFERSON lost to creation of BROOMFIELD.
(Colo. Laws 2001, 63d sess., ch. 103, pp. 256-274)
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December 31, 1994 -
November 15, 2001
[by 1994] JEFFERSON lost to DENVER; W. Grant Ranch Blvd. & S. Estes St.
(USGS, 7.5 Minute Series, various Colorado Quadrangles, 1980-1994)
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December 31, 1980 -
December 31, 1994
[by 1980] JEFFERSON lost to DENVER.
(USGS, 7.5 Minute Series, various Colorado Quadrangles, 1971-2000)
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January 10, 1973 -
December 31, 1980
JEFFERSON lost to DENVER; Park West, W. Stanford Avenue & S. Kipling Street.
(City & County Map; Annexation Map)
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November 08, 1972 -
January 10, 1973
JEFFERSON lost to DENVER; Vaughn, W. Hampden Avenue & S. Harlan Street.
(City & County Map; Annexation Map)
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August 03, 1972 -
November 08, 1972
JEFFERSON lost to DENVER; West Marston, W. Quincy Avenue & South Wadsworth.
(City & County Map; Annexation Map)
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October 09, 1971 -
August 03, 1972
JEFFERSON lost to DENVER; Cavalier Annexation, W. Hampden Avenue & S. Harlan.
(City & County Map; Annexation Map)
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September 09, 1970 -
October 09, 1971
JEFFERSON lost to DENVER; Bear Valley Heights Enclave, S. Harlan & W. Kenyon.
(City & County Map; Annexation Map)
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July 13, 1970 -
September 09, 1970
JEFFERSON lost to DENVER; Bear Valley Enclave, S. Lamar Street & W. Yale Avenue.
(City & County Map; Annexation Map)
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March 26, 1970 -
July 13, 1970
JEFFERSON lost to DENVER; Marston Lake No. 2, W. Quincy Avenue & Wadsworth Boulevard - Sheridan Boulevard.
(City & County Map; Annexation Map)
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February 09, 1970 -
March 26, 1970
JEFFERSON lost to DENVER; Marston Lake No. 1, W. Quincy Avenue & Harlan Street.
(City & County Map; Annexation Map)
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December 15, 1969 -
February 09, 1970
JEFFERSON lost to DENVER; Pinehurst, W. Quincy Avenue & S. Sheridan Boulevard.
(City & County Map; Annexation Map)
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November 21, 1969 -
December 15, 1969
JEFFERSON lost to DENVER; Fehlman No. 2, W. Vassar Avenue & East of S. Wadsworth.
(City & County Map; Annexation Map)
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September 09, 1969 -
November 21, 1969
JEFFERSON lost to DENVER; Sheridan-Kenyon, S. Sheridan Boulevard & W. Hampden Avenue.
(City & County Map; Annexation Map)
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March 24, 1969 -
September 09, 1969
JEFFERSON lost to DENVER; W. Inspiration Point, W. 52nd Avenue & Jay Street.
(City & County Map; Annexation Map)
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January 22, 1968 -
March 24, 1969
JEFFERSON lost to DENVER; Bear Valley Park, W. Teller Avenue & Bear Creek.
(City & County Map; Annexation Map)
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January 16, 1967 -
January 22, 1968
JEFFERSON lost to DENVER; Bear Valley Heights No. 2, W. Kenyon Avenue Ext. & S. Sheridan Boulevard.
(City & County Map; Annexation Map)
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August 22, 1966 -
January 16, 1967
JEFFERSON lost to DENVER; Bear Valley Heights, W. Lehigh Avenue & S. Sheridan Boulevard.
(City & County Map; Annexation Map)
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July 01, 1966 -
August 22, 1966
JEFFERSON gained from DENVER; Bear Valley South, W. Kenyon Avenue & S. Sheridan Boulevard; Bear Valley South #2, W. Kenyon Avenue & S. Harlan Street; Bear Valley South #3, S. Sheridan Boulevard & W. Kenyon Avenue.
(City & County Map; Annexation Map)
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March 28, 1966 -
July 01, 1966
JEFFERSON lost to DENVER; Fehlmann, W. Yale Avenue & S. Wadsworth Boulevard.
(City & County Map; Annexation Map)
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October 20, 1964 -
March 28, 1966
JEFFERSON lost to DENVER; Runyan, Sheridan Boulevard & W. 10th Avenue; Crosby, Hampden Avenue & Lamar Street.
(City & County Map; Annexation Map)
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June 24, 1964 -
October 20, 1964
JEFFERSON lost to DENVER; Bear Valley South #2, Kenyon Ave. & Harlan St., Bear Valley South #3, Kenyon Ave. & Sheridan Blvd.
(City & County Map; Annexation Map)
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July 09, 1963 -
June 24, 1964
JEFFERSON lost to DENVER; Bear Valley South, Kenyon Avenue & Sheridan Boulevard.
(City & County Map; Annexation Map)
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June 24, 1963 -
July 09, 1963
JEFFERSON lost to DENVER; Bear Valley Church, Yale Avenue & S. Lamar Street.
(City & County Map; Annexation Map)
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October 02, 1962 -
June 24, 1963
JEFFERSON lost to DENVER; Inspiration Point Estates,. Sheridan Boulevard & W. 52nd Street.
(City & County Map; Annexation Map)
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July 31, 1962 -
October 02, 1962
JEFFERSON lost to DENVER; West Bear Valley, Lamar Street & Yale Avenue.
(City & County Map; Annexation Map)
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March 27, 1962 -
July 31, 1962
JEFFERSON lost to DENVER; West Jewell, Depew Street & Jewell Avenue.
(City & County Map; Annexation Map)
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May 08, 1961 -
March 27, 1962
JEFFERSON lost to DENVER; Green Meadows, Evans Avenue & Sheridan Boulevard.
(City & County Map; Annexation Map)
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November 09, 1960 -
May 08, 1961
JEFFERSON lost to DENVER; Bear Valley, Yale Avenue & Sheridan Boulevard.
(City & County Map; Annexation Map)
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March 18, 1948 -
November 09, 1960
JEFFERSON lost to DENVER; Inspiration Point, 48th Avenue & Sheridan Boulevard.
(City & County Map; Annexation Map)
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April 09, 1907 -
March 18, 1948
JEFFERSON lost to PARK.
(Colo. Laws 1907, 16th sess., ch. 142, p. 316)
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November 01, 1861 -
April 09, 1907
JEFFERSON created by Colorado Territory from non-county area.
(Colo. Terr. Laws 1861, 1st sess., sec. 24/p. 56)
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