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Jefferson County


Gateway to the Rocky Mountains

Facts & Information

The Cities and communities of Jefferson County, Colorado*

Applewood, Aspen Park, Arvada

Bergen Park, Bow Mar (portion), Buffalo Creek

Columbine (portion), Conifer

East Pleasant View, Edgewater, Evergreen

Genesee, Golden

Idledale, Indian Hills

Ken Caryl, Kittredge

Lakeside, Lakewood, Littleton (portion)

Morrison, Mountain View


South Jeffco Superior (portion)

Westminster (portion), West Pleasant View, Wheat Ridge


*This list of cities may not be complete. The list may contain towns, cities, villages, boroughs, townships, ghost towns and other populated places.

If you have information about any of these unlinked communities, please send it to us and we will add a page for that community. Some of these places above may only be neighborhoods or local area names and are not listed with the census at all or just included in a larger surrounding designated census area..

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Information & Facts about Jefferson County, Colorado

Attractions & other Information - Climate - Economy - Genealogy - Geography -
Government - History - Libraries - Location - Organizations & Groups -
Other Facts & Figures - Population - Schools


Official Jefferson County Website

100 Jefferson County Parkway
Golden, Colorado 80419
Phone: 303-279-6511

Jefferson County Colorado Vital Records
Dakota Building
800 Jefferson County Parkway, Ste 1300
Golden, CO 80401
Phone: (303) 271-6450

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1870 - 2,390
1880 - 6,804
1890 - 8,450
1900 - 9,360
1910 - 14,231
1920 - 14,400
1930 - 21,810
1940 - 30,725
1950 - 55,687
1960 - 127,520
1970 - 235,368
1980 - 371,753
1990 - 438,430
2000 - 527,056
2005 - 532,608
2007 - 535,837

Population density:
2000 - 683 persons per square mile

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Jefferson County is located along the Front Range of the Rocky Mountains. It is also part of the Denver metropolitan area.

Neighboring Counties:
North - Boulder County
Northeast - City and County of Broomfield
East - Adams County
East - City and County of Denver
East - Arapahoe County
East - Douglas County
South - Teller County
Southwest - Park County
West - Clear Creek County
Northwest - Gilpin County

Having ten counties surrounding Jefferson County gives the county the distinction of having the most adjacent counties in the state.

The county is located in the Mountain Time Zone and does participate in daylight savings time during a portion of the year.

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Current weather page for the county

Yearly Average sunshine days: 255 days
Winter Average temperature: 30 degrees
Summer Average temperature: 74

Average Annual Precipitation: 15.4 inches
Average Annual Snowfall: 60.3 inches
Average Annual Humidity: 40 percent

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Other Facts and Figures:

Median age:
2000 - 37.95 years

Housing units:
2000 - 212,488

Median household income:
2000 - $57,339

Per capita income:
2000 - $28,066

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In July of 1858, gold was discovered along the South Platte River in Arapahoe County which brought on the Pike's Peak Gold Rush. As more and more people were lured to area with the promise of easy riches, they discovered they wanted to stay. Due to the distance between the residents of Arapahoe County and the territorial government in Kansas, the people voted to form their own territory. On 24 October 1859, the residents voted in the affirmative. A month later, the new Jefferson Territorial legislature organized twelve counties, including Jefferson County. It was named for Thomas Jefferson, the third US President. Golden City was named the new county seat. On 28 February 1861, President James Buchanan signed an act to organize the Colorado Territory and on 1 November of the same year, the 17 original counties were formed. Jefferson County was included in the original group. The southern portion of Jefferson County was moved to Park County in 1908. Other small changes have been made over the years including the the creation of the city and county of Broomfield in 2001 that took eastern portions of the county.

Founded: November 1, 1861

A history page for Golden, Colorado
A brief history for Jefferson County
A timeline type history for Jefferson County

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Total area: 778 square miles
Land area: 772 square miles
Water area: 6 square miles

Jefferson County ranges between 4 to 18 miles from east to west and 54 miles from north to south.

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Kindred Trails Genealogy page for Jefferson County
Cemeteries page for Jefferson County
US GenWeb page for Jefferson County
Linkpendium page for Jefferson County

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Jefferson County Library
10200 W. 20th Ave.
Lakewood CO 80215
Phone: 303-235-JCPL (5275)

Libraries in Jefferson County

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Jeffco Public Schools
1829 Denver West Drive #27
Golden, Colorado 80401
Phone: 303-982-6500

Colorado School of Mines
offering programs in mining and engineering

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Jefferson Economic Council

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Organizations & Groups

Arvada Chamber of Commerce
7305 Grandview Ave.
Arvada, CO 80002
Phone: 303-424-0313

Arvada Historical Society
7307 Grandview Avenue
Arvada, CO 80002
Phone: 303-431-1261

Colorado Scientific Society
Founded in 1882, the Colorado Scientific Society promotes knowledge, the understanding of science, and its application to human needs, focusing primarily on earth science, but welcoming members with interests in all fields of science.
We meet at 710 10th Street in Golden, Colorado

The Colorado Mountain Club
710 10th Street, Suite 200
Golden, CO 80401
Phone: 303-279-3080

Conifer Area Chamber of Commerce
11873 Spring Rd. #11
Conifer, Colorado 80433
Mailing address:
P.O. Box 127
Conifer, CO 80433
Phone: 303-838-5711

Evergreen Area Chamber of Commerce
Located in the Historic Evergreen Hotel Building
28065 Hwy. 74
Evergreen, Colorado 80439
Phone: (303) 674-3412

Greater Golden Chamber of Commerce
1010 Washington Avenue
Golden, CO 80402
Phone: 303-279-3113

Jefferson County League of Women Voters
1425 Brentwood, Suite 7
Lakewood, CO 80214
Phone: 303-238-0032

Lakewood Historical Society

Metro North Chamber of Commerce
2921 W. 120th Avenue, Suite 210
Westminster, Colorado 80234
Phone: 303-288-1000

The West Chamber
The West Chamber is a regional chamber that includes the unincorporated South Jefferson County area.
1667 Cole Blvd., Building 19, Suite 400
Lakewood, CO 80401
Phone: 303-233-5555

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Attractions & Other Information

Astor House Museum and Clear Creek History Park
explore how the people of Golden, Colorado settled a bustling town that served the developing West as a government center and mining supply town.
822 12th St.
Golden, Colorado 80401
Phone: (303) 278-3557

Buffalo Bill Museum and Grave
987 Lookout Mountain Road,
Golden, CO 80401
Phone: 303.526.0744

Butterfly Pavillion
6252 104th Ave.
Westminster, CO 80020
Phone: 303-469-5441

Chatfield State Park
Located in both Douglas and Jefferson Counties
11500 N Roxborough Park Road
Littleton, CO 80125

Colorado Railroad Museum
17155 West 44th Ave.
Golden, CO 80402
Toll-free: 800-365-6263

Dinosaur Ridge
established to protect the natural resources of the hogback west of Denver and to inform visitors of the area's geologic, prehistoric, historic, and natural features.
16831 W. Alameda Pkwy
Morrison, CO 80465
Phone: (303) 697-3466

Golden Pioneer Museum
923 10th Street
Golden, CO 80401
Phone: 303-278-7151

Hiwan Homestead Museum
This 17-room log lodge was placed on the National Register of Historic Places because of its unique construction.
4208 S. Timbervale Drive
Evergreen, Colorado 80439
Phone: 720-497-7650

Jefferson County Fairgrounds
15200 W. 6th Ave.
Golden, CO 80401
Phone: 303-271-6600

The Lariat Loop Scenic & Historic Byway
a 40-mile scenic circle in the foothills west of Denver, Colorado.
A connection between the communities of Golden, Morrison, Lookout Mountain, and Evergreen, and includes surrounding areas and the natural and cultural elements that comprise our unique regional heritage.

Morrison Natural History Museum
501 Colorado Highway 8
Morrison, CO 80465
Phone: 303-697-1873
Mailing Address:
Post Office Box 564
Morrison, CO 80465

Red Rocks Park and Amphitheatre
8300 W. Alameda Parkway
Morrison, CO 80465
Owned and operated by the City and County of Denver

Rocky Mountain Metropolitan Airport
11755 Airport Way
Broomfield, CO 80021
Phone: 303-271-4850
perfectly situated between downtown Denver and Boulder on U.S. Interstate 36

Rocky Mountain Quilt Museum
1111 Washington Avenue
Golden, CO 80401 |
Phone: 303-277-0377

Tiny Town
The oldest kid size village and railroad in the USA
6249 S. Turkey Creek Rd.
Tiny Town, CO 80465

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This page was created on 12 August 2008

This page was last updated on 17 April 2009 at 11:11 am

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