• county
  • FIPS 08059
  • Largest town: Lakewood

Jefferson County, Colorado

Jefferson County had 578,533 residents in the Census Vintage 2024 estimate, on 764.4 square miles of land. It ranks 4th of 64 in Colorado by population and 50th by land area.

Population
578,533
#4 of 64 in Colorado · #123 in US
Area
764.4 sq mi
#50 of 64 in Colorado · #1,141 in US
Density
757 / sq mi
#4 of 64 in Colorado · #201 in US
Median household income
$102,146
#10 of 64 in Colorado · #118 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Jefferson County within Colorado. Pin: Denver.

Measure from here

Tools and pages that start from Jefferson County

Jefferson County population, land area and income

Jefferson County had 578,533 residents in the Census Vintage 2024 estimate, on 764.4 square miles of land. It ranks 4th of 64 in Colorado by population and 50th by land area. That works out to 756.9 people per square mile, 7.9 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in Colorado has 15,336 residents, so Jefferson County is 37.7 times that size.

Its SAIPE 2023 median household income of $102,146 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

578,533

3144th1st

123rd of 3,144 (US)

Land area

764 sq mi

3144th1st

1141st of 3,144 (US)

Density

756.9 / sq mi

3144th1st

201st of 3,144 (US)

Median household income

$102,146

3143rd1st

118th of 3,143 (US)

Rank within Colorado (64)

Population

578,533

64th1st

4th of 64 (CO)

Land area

764 sq mi

64th1st

50th of 64 (CO)

Density

756.9 / sq mi

64th1st

4th of 64 (CO)

Median household income

$102,146

64th1st

10th of 64 (CO)

How Jefferson County's population changed since 2020

Jefferson County lost 4,636 residents between the July 2020 and July 2024 estimates, a drop of 0.8%. That ranks 45th of 64 in Colorado for growth. The median Colorado county changed by +1.7%, and the state as a whole by +2.9%.

Since the April 2020 estimates base, Jefferson County recorded 23,290 births and 22,373 deaths, a natural change of +917. Net international migration added +4,732 and net domestic migration, people moving to or from other US counties, came to -10,170. The largest single component was domestic migration, which removed 10,170 people.

583.2k2020580.9k2021576.6k2022577.7k2023578.5k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
23,290
Deaths
22,373
Net international migration
+4,732
Net domestic migration
-10,170
Change, July 2023 to July 2024
+840

Where Jefferson County is

The Census internal point of Jefferson County is at 39.579500, -105.245500. It sits in UTM zone 13N. The map shades Colorado's 64 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Jefferson County outlined. Dots are towns of 1,000+ people with residents in it.

Otero County: -3.6%Lake County: -0.6%Adams County: +4.3%Kit Carson County: +0.2%Phillips County: -0.9%Bent County: +5.5%Lincoln County: -1.1%Washington County: -0.9%Hinsdale County: -5.1%Alamosa County: +1.9%Kiowa County: -4.1%Arapahoe County: +1.8%Archuleta County: +5.1%Montrose County: +4.6%Jefferson County: -0.8%Gilpin County: +2.5%Larimer County: +4.1%Custer County: +17.5%Saguache County: +4.3%Mineral County: +7.1%Broomfield County: +5.1%Logan County: -2.1%Mesa County: +3.4%Eagle County: -2.4%Denver County: +1.6%Pitkin County: -4.2%Boulder County: -0.2%El Paso County: +2.6%Las Animas County: +0.1%San Miguel County: -2.9%Douglas County: +9.3%Cheyenne County: -1.9%Garfield County: +2.2%Ouray County: +6.5%San Juan County: +16.0%Yuma County: +0.8%Elbert County: +12.1%Prowers County: -0.5%Morgan County: +4.2%Delta County: +3.7%Chaffee County: +6.6%Huerfano County: +2.4%Teller County: +0.5%Costilla County: +5.3%Baca County: -3.3%Routt County: +1.6%Conejos County: +1.3%Summit County: -1.1%Clear Creek County: -3.0%Fremont County: +2.5%Rio Blanco County: +1.3%Dolores County: +5.8%Grand County: +2.6%Gunnison County: +2.1%Park County: +5.1%Sedgwick County: -5.5%Montezuma County: +3.7%La Plata County: +2.1%Moffat County: -1.0%Rio Grande County: -3.6%Weld County: +11.5%Pueblo County: +0.9%Jackson County: -7.6%Crowley County: -1.5%
Change 2020 to 2024
  1. < -1.9%
  2. < +0.5%
  3. < +2.4%
  4. < +5.1%
  5. ≥ +5.1%
no data

Orange pin: Jefferson County internal point. Dark pin: Denver.

Internal point

Decimal
39.579500, -105.245500
DMS
39°34'46.20"N 105°14'43.80"W
UTM
13N 478916.2E 4381116.3N
Geohash
9xj1jj4x6
Plus code
85FPHQH3+RR

Towns in Jefferson County

7 incorporated places of 1,000+ people have residents in Jefferson County, 380,989 people together, or 66% of the county. Each figure counts only the part of the town inside Jefferson County; towns marked "part" extend into another county. The largest is Lakewood with 156,868.

  1. 01Lakewood156,868
  2. 02Arvada (part)119,092
  3. 03Westminster (part)45,794
  4. 04Wheat Ridge31,999
  5. 05Golden20,151
  6. 06Edgewater4,880
  7. 07Littleton (part)2,205
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Jefferson County

The Census 2024 county adjacency file lists 10 neighbors for Jefferson County. The most populous is Denver County, CO, with 729,019 residents. Distances run between Census internal points in a straight line.

Distance to Denver and the nearest big city

Denver is 17.7 miles NE of Jefferson County's internal point in a straight line. The nearest place of 100,000 or more is Lakewood, CO (population 156,868), 10.7 miles away.

Jefferson County FIPS code

The FIPS code of Jefferson County is 08059: state code 08 for Colorado plus county code 059. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $102,146.

Questions people ask

What is the population of Jefferson County, Colorado?

The Census Vintage 2024 estimate for July 1, 2024 is 578,533. That is down 4,636 people (0.8%) from the July 2020 estimate of 583,169.

What is the FIPS code of Jefferson County?

08059. The first two digits (08) are Colorado; the last three (059) identify the county.

What is the largest town in Jefferson County?

Lakewood, with 156,868 residents inside Jefferson County in 2024.

Which counties border Jefferson County?

10 county-equivalents border it in the Census 2024 adjacency file: Denver County, CO; Arapahoe County, CO; Adams County, CO; Douglas County, CO; Boulder County, CO; Broomfield County, CO; Teller County, CO; Park County, CO; Clear Creek County, CO; Gilpin County, CO.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.