Jefferson County, Colorado

Jefferson County: County in Colorado, United States

About

Jefferson County is a county located in the U.S. state of Colorado. As of the 2010 census, the population was 534,543 and a population density of 265 people per km². After 10 years in 2020 county had an estimated population of 583,283 inhabitants. Its county seat is Golden. The county was created 163 years ago in 1860.

Jefferson County locator map
Location of Jefferson County on Colorado map.

Quick Facts about Jefferson County

Population : 583,283 (2020)
Country : United States of America
State : Colorado (United States)
Different from : Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson Parish, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County, Jefferson County
Twitter username : jeffcocolorado
Area : 2015 km2
Water as percent of area : 1.3%
Land as percent of area : 98.7%
Named for : Thomas Jefferson
Capital : Golden
Establishment : January 01, 1861
Time Zone : America/Denver
Local time : 04:26:39 (17th November 2024)
Density : 289 Pop. per km² as of 2020
Population growth : 8.36% (2010-2020)
Jefferson County Courthouse from I-70 image
Jefferson County Courthouse from I-70
Jefferson County Courthouse from I-70 image
Jefferson County Courthouse from I-70 image

Geography

Jefferson County is located at 39°35'11"N 105°15'2"W (39.5864200, -105.2504700). It has 10 neighbors: Adams County, Arapahoe County, Broomfield County, Clear Creek County, Denver County, Douglas County, Gilpin County, Park County, Teller County and Boulder County.

Jefferson County map

Click "full screen" full screen map icon to open full mode. View satellite images

The largest city of Jefferson County is Lakewood with a population of 157,429. Other cities include, Arvada population 121,936, Wheat Ridge population 31,857, Columbine population 24,280 and Golden population 20,347. See all Jefferson County cities & populated places.

Jefferson County Populated Places

Cities, towns, neighborhoods & other populated places in Jefferson County.

City Name Population Title
Lakewood 157,429 The fifth most populous city in Colorado.
Arvada 121,936 The second most populous city in Jefferson County, Colorado.
Ken Caryl 32,438 Census-designated place in Jefferson County, Colorado
Wheat Ridge 31,857 City in Colorado, USA
Columbine 24,280 School shooting at Columbine High School in Columbine, Colorado, United States on 20 April 1999
Golden 20,347 County seat of Jefferson County, Colorado, United States
Applewood 7,160 Census designated place
Edgewater 5,393 Human settlement in Jefferson County, Colorado, United States of America
Evergreen 3,944 County seat of Conecuh County, Alabama, United States
Genesee 3,609 City in Idaho
Kittredge 1,304 Census-designated place in Jefferson County, Colorado
Mountain View 549 Town in Jefferson County, Colorado, USA
Morrison 430 Municipality in Colorado, United States

Jefferson County has 10 neighbours.

Demographics

The population of Jefferson County increased by 8.36% in 10 years.

Year Population % Change Method
2010 534,543 - census
2011 540,506 1.1% estimation process
2012 546,602 1.12% estimation process
2013 552,031 0.98% estimation process
2014 558,819 1.21% estimation process
2015 564,888 1.07% estimation process
2016 571,413 1.14% estimation process
2017 575,417 0.7% estimation process
2018 579,392 0.69% estimation process
2019 582,881 0.6% estimation process
2020 583,283 0.07% estimation process

Comitatul Jefferson, Comte de Jefferson, Comté de Jefferson, Condado de Jefferson, Condado han Jefferson, Contea di Jefferson, Dzhefersun, Dzhefferson, Hrabstwo Jefferson, Jeferson srjan, Jefferson, Jefferson Kun, Jefferson Kūn, Jefferson konderria, Jefferson megye, Jeffersoni maakond, Okrug DZeferson, Quan Jefferson, Quận Jefferson, jefason jun, jepharasana ka'unti, jie fei xun xian, mqatʿt jyfyrswn, shhrstan jfrswn klradw, Джеферсън, Джефферсон, Округ Џеферсон, Ջեֆերսոն շրջան, جیفرسن کاؤنٹی، کولوراڈو, شهرستان جفرسون، کلرادو, مقاطعة جيفيرسون, জেফারশন কাউন্টি, ジェファーソン郡, 杰斐逊县

People born in Jefferson County (1)

American pilot Donald Sheldon was born in Jefferson County

Other places with the same name (25)

Colorado Other Counties (more counties)

County Name Population Title
Denver 735,538 The twentieth most populous city in the United States and the center of the Denver metropolitan area.
Denver County 735,538 County in Colorado, United States, coterminous with the City of Denver
El Paso County 728,310 One of the 64 counties in the U.
Arapahoe County 657,452 County in Colorado, United States
Adams County 519,883 County in Colorado, United States
Colorado Springs 482,131 The second most populous city in Colorado and the center of the Colorado Springs metropolitan area.
Aurora 387,377 The third most populous city in Colorado and the center of the Denver metropolitan area.
Douglas County 360,750 County in Colorado, United States
Larimer County 360,428 County in Colorado, United States
Weld County 333,983 County in Colorado, United States
Boulder County 327,171 County in Colorado, United States
Pueblo County 169,823 County in Colorado, United States
Fort Collins 168,234 The fifth most populous city in Colorado.
Lakewood 157,429 The fifth most populous city in Colorado.
Mesa County 155,603 County in Colorado, United States
Thornton 148,113 The seventh most populous city in Colorado.