The Info List - Jefferson County, Colorado

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Jefferson County (Jeffco) /ˈdʒɛfərsən/ is one of the 64 counties in the U.S. state
U.S. state
of Colorado. As of the 2010 census, the population was 534,543,[1] making it the fourth-most populous county in Colorado. The county seat is Golden,[2] and the most populous city is Lakewood. Jefferson County is included in the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area. Located along the Front Range
Front Range
of the Rocky Mountains, Jefferson County is adjacent to the state capital of Denver. In 2010, the center of population of Colorado
was located in Jefferson County.[3] The county's slogan is the "Gateway to the Rocky Mountains", and it is commonly nicknamed Jeffco. The name Jeffco is incorporated in the name of the Jeffco School District, the Jeffco Business Center Metropolitan District No. 1, and several businesses located in Jefferson County. Jeffco is also incorporated in the unofficial monikers of many Jefferson County agencies. The Rocky Mountain Metropolitan Airport operated by Jefferson County was previously known as the Jeffco Airport. A major employer in Jefferson County is the large Coors Brewing Company in Golden. Also, the state-supported Colorado
School of Mines is located in Jefferson County, offering programs in STEM topics such as mining, geology, chemistry, and engineering.


1 History 2 Geography

2.1 Adjacent counties 2.2 Recreational areas 2.3 Major highways

3 Demographics 4 Education 5 Government and infrastructure 6 Recreation

6.1 State parks 6.2 National forests and wilderness 6.3 National wildlife refuges 6.4 Historic trail 6.5 Recreational trails 6.6 Scenic byway 6.7 Golf courses

7 Communities

7.1 Cities 7.2 Towns 7.3 Census-designated places 7.4 Unincorporated communities

8 See also 9 References 10 External links

History[edit] On August 25, 1855, the Kansas Territorial Legislature created Arapahoe County to govern the entire western portion of the territory. The county was named for the Arapaho Nation
Arapaho Nation
of Native Americans that lived in the region. In June 22, 1850, gold was discovered along the South Platte River
South Platte River
in Arapahoe County (in present-day Englewood). This discovery precipitated the Pike's Peak Gold
Rush. Many residents of the mining region felt disconnected from the remote territorial governments of Kansas and Nebraska, so they voted to form their own Territory of Jefferson on October 24, 1859. The following month, the Jefferson Territorial Legislature organized 12 counties for the new territory, including Jefferson County. Jefferson County was named for the namesake of the Jefferson Territory, Thomas Jefferson, the principal author of the Declaration of Independence and the nation's third president.[4] Golden City
served as the county seat of Jefferson County. Robert Williamson Steele, Governor
of the Provisional Government of the Territory of Jefferson
Territory of Jefferson
from 1859 to 1861, built his home in the county at Mount Vernon and later at Apex. The Jefferson Territory never received federal sanction, but during his last week in office, President James Buchanan
James Buchanan
signed an act which organized the Territory of Colorado
on February 28, 1861.[5] That November 1, the new Colorado
General Assembly organized the 17 original counties of Colorado, including a new Jefferson County. In 1908, the southern tip of Jefferson County was transferred to Park County, reducing Jefferson County to its present length of 54 miles (87 km). Several annexations by the City
& County of Denver and the 2001 consolidation of the City
& County of Broomfield removed the east and extreme northwestern portion of the county, respectively. Geography[edit] According to the U.S. Census
Bureau, the county has a total area of 774 square miles (2,000 km2), of which 764 square miles (1,980 km2) is land and 9.8 square miles (25 km2) (1.3%) is water.[6] Adjacent counties[edit] Jefferson County is one of the few counties in the United States
United States
to border as many as ten counties.

Boulder County - north City
and County of Broomfield - northeast Adams County - east City
and County of Denver
- east Arapahoe County - east Douglas County - east Teller County - south Park County - southwest Clear Creek County - west Gilpin County - northwest

Recreational areas[edit]

Alderfer/Three Sisters Park Apex Park Bear Creek Lake Park Centennial Cone Park Clear Creek Canyon Park Coal Creek Canyon Crown Hill Park Deer Creek Canyon Park Elk Meadow Park Fairmount Trail Flying J Ranch Park Hildebrand Ranch Park Hiwan Homestead Museum Lair o' the Bear Park Lewis Meadows Park Lookout Mountain Nature Center Matthews/Winters Park Meyer Ranch Park Mount Falcon Park Mount Galbraith Park Mount Glennon Mount Lindo North Table Mountain Park Pine Valley Ranch Park Ranson/Edwards Homestead Ranch Reynolds Park Sister City
Park South Table Mountain Park South Valley Park Standley Lake Regional Park Van Bibber Park Welchester Tree Grant Park White Ranch Park Windy Saddle Park Urban Trails

Major highways[edit]

U.S. Highway 6 U.S. Highway 40 U.S. Highway 285 Interstate 70 State Highway 93 State Highway 470


Historical population

Census Pop.

1870 2,390

1880 6,804


1890 8,450


1900 9,306


1910 14,231


1920 14,400


1930 21,810


1940 30,725


1950 55,687


1960 127,520


1970 233,031


1980 371,753


1990 438,430


2000 527,056


2010 534,543


Est. 2017 574,613 [7] 7.5%

U.S. Decennial Census[8] 1790-1960[9] 1900-1990[10] 1990-2000[11] 2010-2015[1]

As of the census[12] of 2000, there were 527,056 people, 206,067 households, and 140,537 families residing in the county. The population density was 683 people per square mile (264/km²). There were 212,488 housing units at an average density of 275 per square mile (106/km²). The racial makeup of the county was 90.59% White, 0.89% Black or African American, 0.75% Native American, 2.28% Asian, 0.08% Pacific Islander, 3.23% from other races, and 2.18% from two or more races. 9.95% of the population were Hispanic or Latino of any race. There were 206,067 households out of which 33.40% had children under the age of 18 living with them, 55.10% were married couples living together, 9.10% had a female householder with no husband present, and 31.80% were non-families. 24.50% of all households were made up of individuals and 6.30% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.03. In the county, the population was spread out with 25.30% under the age of 18, 8.10% from 18 to 24, 32.10% from 25 to 44, 24.90% from 45 to 64, and 9.60% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 99.00 males. For every 100 females age 18 and over, there were 96.80 males. The median income for a household in the county was $57,339, and the median income for a family was $67,310. Males had a median income of $45,306 versus $32,372 for females. The per capita income for the county was $28,066. About 3.40% of families and 5.20% of the population were below the poverty line, including 5.80% of those under age 18 and 5.10% of those age 65 or over. According to a report in the Journal of the American Medical Association, residents of Jefferson County had a 2014 life expectancy of 80.02 years.[13] Education[edit] Jefferson County School District R-1. Government and infrastructure[edit]

Jefferson County vote by party in presidential elections[14]

Year Republican Democratic Others

2016 42.0% 138,177 48.9% 160,776 9.1% 29,930

2012 46.4% 144,197 51.2% 159,296 2.4% 7,559

2008 44.6% 131,628 53.6% 158,158 1.8% 5,282

2004 51.8% 140,644 46.6% 126,558 1.6% 4,366

2000 51.0% 120,138 42.9% 100,970 6.1% 14,383

1996 48.4% 101,517 42.7% 89,494 8.9% 18,712

1992 37.1% 82,705 36.2% 80,834 26.7% 59,664

1988 56.4% 110,820 41.6% 81,824 2.0% 3,867

1984 68.9% 124,496 29.7% 53,700 1.4% 2,432

1980 59.7% 97,008 25.5% 41,525 14.8% 24,078

1976 60.4% 87,080 36.6% 52,782 2.9% 4,211

1972 69.9% 80,082 27.5% 31,555 2.6% 2,960

1968 56.9% 50,847 35.1% 31,392 8.0% 7,118

1964 43.5% 33,398 56.2% 43,162 0.3% 252

1960 59.6% 34,105 40.1% 22,962 0.2% 137

1956 63.7% 25,398 35.8% 14,270 0.5% 197

1952 63.1% 19,971 36.3% 11,509 0.6% 194

1948 51.3% 9,903 47.4% 9,145 1.4% 260

1944 57.2% 9,815 42.4% 7,277 0.4% 68

1940 52.8% 8,780 46.6% 7,745 0.6% 100

1936 41.1% 5,271 56.8% 7,283 2.1% 271

1932 45.8% 5,522 50.0% 6,023 4.2% 503

1928 69.1% 6,754 29.5% 2,880 1.4% 141

1924 63.7% 4,869 16.6% 1,271 19.7% 1,505

1920 61.5% 3,593 33.2% 1,941 5.2% 306

1916 36.6% 2,040 60.4% 3,368 3.0% 166

1912 18.9% 1,011 43.1% 2,309 38.0% 2,037

The Federal Correctional Institution, Englewood
Federal Correctional Institution, Englewood
is in unincorporated Jefferson County.[15] The Rocky Flats Plant
Rocky Flats Plant
produced nuclear weapons in Jefferson County from 1952 until 1989. The Jefferson County Public Library, established in 1952.

Recreation[edit] State parks[edit]

Chatfield State Park Golden Gate Canyon State Park Staunton State Park

National forests and wilderness[edit]

Pike National Forest Roosevelt National Forest Lost Creek Wilderness

National wildlife refuges[edit]

Rocky Flats National Wildlife Refuge Two Ponds National Wildlife Refuge

Historic trail[edit]

South Platte Trail

Recreational trails[edit]

American Discovery Trail Apex National Recreation Trail Big Dry Creek National Recreation Trail Colorado
Trail Platte River Greenway National Recreation Trail Two Ponds National Recreation Trail

Scenic byway[edit]

Lariat Loop Scenic and Historic Byway

Golf courses[edit]

Applewood Golf Course Bear Creek Golf Club Evergreen Golf Course Foothills Golf Course Fossil Trace Golf Course Fox Hollow Golf Course Heritage Golf Course at Westmoor Hiwan Golf Club Homestead Golf Course Indian Tree Golf Club Lake Arbor Golf Course Lakewood Country Club Racoon Creek Golf Course Rolling Hills Country Club

Communities[edit] Cities[edit]

Arvada (part) Edgewater Golden Lakewood Littleton (part) Westminster (part) Wheat Ridge


Bow Mar Lakeside Morrison Mountain View Superior (part)

Census-designated places[edit]

Applewood Aspen Park Coal Creek (partial) Columbine Dakota Ridge East Pleasant View Evergreen Fairmount Genesee Idledale Indian Hills Ken Caryl Kittredge West Pleasant View

Unincorporated communities[edit]

Buffalo Creek Conifer Foxton Idledale Pine Pine Junction

See also[edit]

Geography portal North America portal United States
United States
portal Colorado
portal Mountains portal

Arapahoe County, Kansas Territory Colorado
metropolitan areas Denver-Aurora, CO Combined Statistical Area Denver-Aurora-Lakewood, CO Metropolitan Statistical Area Front Range
Front Range
Urban Corridor Index of Colorado-related articles Jefferson County, Colorado
Territory Jefferson County, Jefferson Territory National Register of Historic Places listings in Jefferson County, Colorado North Central Colorado
Urban Area Outline of Colorado Pike's Peak Gold


^ a b "State & County QuickFacts". United States
United States
Bureau. Archived from the original on July 12, 2011. Retrieved June 8, 2014.  ^ "Find a County". National Association of Counties. Archived from the original on 2011-05-31. Retrieved 2011-06-07.  ^ "Centers of Population by State: 2010". United States
United States
Bureau. Archived from the original on January 3, 2014. Retrieved June 8, 2014.  ^ Gannett, Henry (1905). The Origin of Certain Place Names in the United States. Govt. Print. Off. p. 168.  ^ "An Act to provide a temporary Government for the Territory of Colorado" (PDF). Thirty-sixth United States
United States
Congress. 1861-02-28. Retrieved 2007-11-26.  ^ "US Gazetteer files: 2010, 2000, and 1990". United States
United States
Census Bureau. 2011-02-12. Retrieved 2011-04-23.  ^ "American FactFinder". Retrieved March 23, 2018.  ^ "U.S. Decennial Census". United States
United States
Bureau. Archived from the original on May 12, 2015. Retrieved June 8, 2014.  ^ "Historical Census
Browser". University of Virginia Library. Retrieved June 8, 2014.  ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census
Bureau. Retrieved June 8, 2014.  ^ " Census
2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States
United States
Bureau. Retrieved June 8, 2014.  ^ "American FactFinder". United States
United States
Bureau. Retrieved 2011-05-14.  ^ Dwyer-Lindgren, Laura (8 May 2017). "Inequalities in Life Expectancy Among US Counties, 1980 to 2014". Journal of the American Medical Association: Internal Medicine. doi:10.1001/jamainternmed.2017.0918. Retrieved 9 May 2017.  ^ Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved May 26, 2017.  ^ "FCI Englewood Contact Information." Federal Bureau of Prisons. Retrieved on July 28, 2010.

External links[edit]

Wikimedia Commons has media related to Jefferson County, Colorado.

Jefferson County Government website Colorado
County Evolution by Don Stanwyck Colorado
Historical Society Jefferson County Open Space Parks

Places adjacent to Jefferson County, Colorado

Gilpin County Boulder County City
and County of Broomfield

Clear Creek County

Jefferson County, Colorado

Adams County, City
and County of Denver, Arapahoe County, and Douglas County

Park County Teller County

v t e

Municipalities and communities of Jefferson County, Colorado, United States

County seat: Golden


Arvada‡ Edgewater Golden Lakewood Littleton‡ Westminster‡ Wheat Ridge


Bow Mar‡ Lakeside Morrison Mountain View Superior‡


Applewood Aspen Park Coal Creek‡ Columbine‡ Dakota Ridge East Pleasant View Evergreen Fairmount Genesee Idledale Indian Hills Ken Caryl Kittredge West Pleasant View

Unincorporated communities

Buffalo Creek Conifer Foxton Pine Pine Junction Shaffers Crossing

Ghost town



‡This populated place also has portions in an adjacent county or counties

v t e

 State of Colorado



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Coordinates: 39°35′N 105°15′W / 39.59°N 105.25°W / 39.59; -105.25

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WorldCat Identities VIAF: 1313429