Jefferson County, Colorado Population 2020

Jefferson County, Colorado's estimated population is 589,065 with a growth rate of 0.76% in the past year according to the most recent United States census data. Jefferson County, Colorado is the 4th largest county in Colorado.

Year Population Growth Growth Rate
2020589,0654,4160.76%
2019584,6494,4160.76%
2018580,2334,4160.77%
2017575,8174,0380.71%
2016571,7796,5561.16%
2015565,2236,1381.10%
2014559,0856,8311.24%
2013552,2545,4901.00%
2012546,7646,0091.11%
2011540,7554,9220.92%
2010535,83397,40322.22%
1990438,43066,67717.94%
1980371,753138,72259.53%
1970233,031105,51182.74%
1960127,52071,833128.99%
195055,68724,96281.24%
194030,7258,91540.88%
193021,8107,41051.46%
192014,4001691.19%
191014,2314,92552.92%
19009,30685610.13%
18908,4501,64624.19%
18806,8044,414184.69%
18702,3900.00%
2020 Growth Rate
0.76%
County Website
Founded
November 1, 1861
County Seat

Jefferson County, Colorado Population Growth

Population by Race

Race Population Percentage
White517,64490.75%
Asian16,2432.85%
Two or More Races15,2822.68%
Some Other Race10,2001.79%
Black or African American6,6391.16%
American Indian and Alaska Native4,1620.73%
Native Hawaiian and Other Pacific Islander2570.05%

Jefferson County, Colorado Population Pyramid 2020

Jefferson County, Colorado Median Age

40.4


Total

39


Male

41.9


Female

Jefferson County, Colorado Adults

There are 454,501 adults, (88,707 of whom are seniors) in Jefferson County, Colorado.

Jefferson County, Colorado Age Dependency

55.9

Age Dependency Ratio

24.3

Old Age Dependency Ratio

31.7

Child Dependency Ratio

Jefferson County, Colorado Sex Ratio

Female

286,508

50.23%

Male

283,919

49.77%

Jefferson County, Colorado Households and Families

Jefferson County, Colorado Renter vs Owner Occupied by Household Type

Jefferson County, Colorado Household Types

Type Owner Renter
Married84.7%15.3%
All70.4%29.6%
Female57.9%42.1%
Male57%43%
Non Family54.6%45.4%

70.4%

Rate of Home Ownership

Type Count Average Size Owned
All230,1532.4470.4
Married117,7083.0484.7
Non Family82,5101.3454.6
Female20,1233.1257.9
Male9,8123.0757

2.98

Average Family Size

2.44

Average Household Size

5.9%

Unmarried (Opposite Sex)

0.4%

Unmarried (Same Sex)

Jefferson County, Colorado Education

Education Attained Count Percentage
Less Than 9th Grade6,8901.68%
9th to 12th Grade15,9503.90%
High School Graduate84,35120.62%
Some College89,11321.79%
Associates Degree32,4487.93%
Bachelors Degree113,40227.73%
Graduate Degree66,83416.34%

Jefferson County, Colorado Educational Attainment by Race

Name Total High School Bachelors
White335,184324,338159,332
Hispanic51,14041,36610,637
Asian11,46810,1775,991
Other Race6,8465,6501,436
Multiple Races6,6506,1552,749
Black4,3764,0971,487
Native American2,8382,236520
Islander19617559

The highest rate of high school graduation is among white people with a rate of 96.76%.

The highest rate of bachelors degrees is among asian people with a rate of 52.24%.

Name Average Male Female
Overall$47,553$54,542$40,931
Less Than High School$26,809$30,742$18,154
High School Grad$36,782$41,165$31,780
Some College$41,426$49,145$35,321
Bachelors Degree$58,484$71,831$47,032
Graduate Degree$70,833$85,827$59,281

$47,553

Average Earnings

$54,542

Average Male

$40,931

Average Female

Jefferson County, Colorado Language

Jefferson County, Colorado Language by Age

Jefferson County, Colorado Language

89.35% of Jefferson County, Colorado residents speak only English, while 10.65% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 6.19% of the population.

Jefferson County, Colorado Poverty

Jefferson County, Colorado Poverty by Race

Name Total In Poverty Poverty Rate
White440,27526,0885.93%
Hispanic85,55211,39213.32%
Multiple15,0771,74011.54%
Asian16,1821,4689.07%
Other10,0781,38513.74%
Black6,22391114.64%
Native3,76357315.23%
Islander257207.78%

7.38%

Overall Poverty Rate

6.84%

Male Poverty Rate

7.92%

Female Poverty Rate

Poverty in Jefferson County, Colorado

The race most likely to be in poverty in Jefferson County, Colorado is Native, with 15.23% below the poverty level.

The race least likely to be in poverty in Jefferson County, Colorado is White, with 5.93% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.41%. Among those working part-time, it was 11.21%, and for those that did not work, the poverty rate was 13.56%.

Name Poverty
Less Than High School18.21%
High School8.36%
Some College6.15%
Bachelors or Greater3.28%
Name Poverty
Female Unemployed23.14%
Male Unemployed18.97%
Female Employed4.29%
Male Employed3.46%

Jefferson County, Colorado Income

Jefferson County, Colorado Income by Household Type

Name Median Mean
Households$78,943$102,153
Families$99,247$121,774
Married Families$110,332$134,021
Non Families$48,263$63,116

Jefferson County, Colorado Marital Status

Jefferson County, Colorado Marital Status

Marriage Rates

52.6%

Overall Marriage Rate

53.2%

Male Marriage Rate

51.9%

Female Marriage Rate

Jefferson County, Colorado Married by Age and Sex

Jefferson County, Colorado Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 35-44.

Jefferson County, Colorado Marital Status by Race

Jefferson County, Colorado Veterans

38,191

Number of Veterans

35,095

Male Veterans

3,096

Female Veterans

War Veterans
Vietnam14,693
First Gulf War6,834
Second Gulf War6,483
Korea3,220
World War II1,463
Age Group Veterans
65 to 7410,547
35 to 548,748
75+8,476
55 to 646,804
18 to 343,616
Name Veterans % of Total
White35,9028.63%
Hispanic3,1695.21%
Black54910.62%
2 or More5186.09%
Other5186.44%
Asian3692.84%
Indian3269.49%
Hawaiian93.80%

$Jefferson County, Colorado Veterans by Education

5.04%

Veteran Poverty Rate

24.58%

Veteran Disability Rate

Jefferson County, Colorado Employment Status

69.4%

Labor Force Participation

66.8%

Employment Rate

3.7%

Unemployment Rate

Jefferson County, Colorado Place of Birth

Origin of Non-Citizens

Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

46.12%

Born in Colorado

93.41%

Native Born

6.59%

Foreign Born

3.14%

Non Citizen

Place of Birth

93.41% of Jefferson County, Colorado residents were born in the United States, with 46.12% having been born in Colorado. 3.14% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990