Thornton, Colorado Population 2021

145,688
Loading...

Thornton is a city located in Colorado. With a 2020 population of 145,688, it is the 6th largest city in Colorado and the 183rd largest city in the United States. Thornton is currently growing at a rate of 1.47% annually and its population has increased by 22.66% since the most recent census, which recorded a population of 118,772 in 2010. Thornton reached it's highest population of 145,688 in 2021. Spanning over 38 miles, Thornton has a population density of 4,059 people per square mile.

The average household income in Thornton is $93,814 with a poverty rate of 8.82%. The median rental costs in recent years comes to $1,495 per month, and the median house value is $322,200. The median age in Thornton is 33.8 years, 33.1 years for males, and 34.4 years for females. For every 100 females there are 98.9 males.

The city of Thornton is a home rule municipality located in Colorado. Situated in Weld and Adams counties, and the northeast region of the Denver-Aurora-Broomfield, CO Metropolitan Statistical Area, Thornton is about 10 miles north-northeast of downtown Denver, the most populous city of Colorado.

Population Growth

In 1960, four years after Thornton was incorporated as a city, the population stood at 11,353. The years between 1970 and 1980 saw a huge growth from 13,326 to 42,054, and an annual growth rate of 12.18%. This could be attributed to the annexation of neighboring communities.

As of 2019, the population of Thornton, Colorado stands at 137,000, with a percentage growth of over 1,000% in the 60 years since the city was incorporated in 1956. Colorado is now the 7th fastest-growing state in the U.S. with much of the growth in the Metro Denver area. Since the 1930s, Metro Denver's growth rate has outpaced the national average (http://www.metrodenver.org/do-business/demographics/population/) and this growth has included the area of Thornton.

Up until 1953, Thornton consisted exclusively of farmland. A purchase that year by Sam Hoffman saw the planning of the first community in Adams County. It was the first to offer full municipal services from a single tax levy, including services such as free trash pickup and recreation. By the end of 1955, Thornton had over 5000 residents in over 1,200 homes. Thornton was incorporated as a city a year later in 1956.

June of 1981 saw Thornton receiving one of the two most destructive tornados in the Denver metropolitan area’s history, causing damage totaling over $15 million. The second touched down in the nearby Denver suburb of Lakewood. These were followed by three more just 7 years later in 1988.

Thornton Demographics

According to the most recent ACS, the racial composition of Thornton was:

  • White: 84.03%
  • Asian: 4.86%
  • Two or more races: 4.44%
  • Other race: 3.57%
  • Black or African American: 2.10%
  • Native American: 0.97%
  • Native Hawaiian or Pacific Islander: 0.04%
The current population of Thornton, Colorado is 145,688, based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 139,352.The last official US Census in 2010 recorded the population at 118,772.

Thornton, Colorado Population 2021

Population by Race

Race Population Percentage
White115,01084.03%
Asian6,6524.86%
Two or More Races6,0794.44%
Some Other Race4,8803.57%
Black or African American2,8722.10%
American Indian and Alaska Native1,3240.97%
Native Hawaiian and Other Pacific Islander510.04%
Loading...

Thornton Population by Race

Thornton Population Pyramid 2021

Loading...

Thornton Median Age

33.8


Total

33.1


Male

34.4


Female

Thornton Adults

There are 98,443 adults, (12,698 of whom are seniors) in Thornton.

Thornton Age Dependency

59.6

Age Dependency Ratio

14.8

Old Age Dependency Ratio

44.8

Child Dependency Ratio

Thornton Sex Ratio

Female

68,806

50.27%

Male

68,062

49.73%

Thornton Population by Age

Thornton Renter vs Owner Occupied by Household Type

Loading...

Thornton Household Types

Type Owner Renter
Married83.1%16.9%
All72.8%27.2%
Male63.3%36.7%
Female60.2%39.8%
Non Family59.6%40.4%

72.8%

Rate of Home Ownership

Thornton Households and Families

Type Count Average Size Owned
All45,6762.9972.8
Married25,2093.6283.1
Non Family12,7681.3959.6
Female5,0343.4460.2
Male2,6653.7563.3

3.48

Average Family Size

2.99

Average Household Size

Loading...

Thornton Households by Type

Loading...
Education Attained Count Percentage
Less Than 9th Grade4,8345.51%
9th to 12th Grade6,3497.24%
High School Graduate23,28026.55%
Some College19,21421.91%
Associates Degree8,5319.73%
Bachelors Degree17,90620.42%
Graduate Degree7,5628.62%
Loading...

Thornton Educational Attainment by Sex (over 25)

Thornton Educational Attainment by Race

Loading...
Name Total High School Bachelors
White54,52352,23619,477
Hispanic25,09817,5043,083
Asian4,4763,4281,703
Other Race3,0422,239369
Multiple Races2,6862,402770
Black1,6341,522550
Native American98381473
Islander51514

The highest rate of high school graduation is among islander people with a rate of 100.00%.

The highest rate of bachelors degrees is among asian people with a rate of 38.05%.

Thornton Educational Attainment by Race

Loading...
Name Average Male Female
Overall$46,010$53,151$37,468
Less Than High School$31,271$40,726$20,972
High School Grad$39,331$46,115$30,982
Some College$45,292$54,428$35,985
Bachelors Degree$57,693$67,580$46,943
Graduate Degree$66,614$87,958$61,333

$46,010

Average Earnings

$53,151

Average Male

$37,468

Average Female

Thornton Earnings by Educational Attainment

Thornton Language by Age

Loading...

Thornton Language

75.41% of Thornton residents speak only English, while 24.59% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 18.60% of the population.

Thornton Language

Thornton Poverty by Race

Loading...
Name Total In Poverty Poverty Rate
Hispanic46,5176,58514.16%
White76,2224,2215.54%
Asian6,6306449.71%
Multiple6,0595358.83%
Other4,8744749.73%
Black2,81730210.72%
Native1,313433.27%
Islander511325.49%

8.82%

Overall Poverty Rate

8.18%

Male Poverty Rate

9.45%

Female Poverty Rate

Poverty in Thornton

The race most likely to be in poverty in Thornton is Islander, with 25.49% below the poverty level.

The race least likely to be in poverty in Thornton is Native, with 3.27% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.09%. Among those working part-time, it was 12.84%, and for those that did not work, the poverty rate was 16.08%.

Thornton Poverty

Loading...
Name Poverty
Less Than High School17.13%
High School8.11%
Some College6.99%
Bachelors or Greater2.36%

Thornton Poverty Rate by Education

Loading...
Name Poverty
Male Unemployed39.11%
Female Unemployed29.16%
Female Employed5.75%
Male Employed3.94%

Thornton Poverty Rate by Employment Status and Sex

Thornton Income by Household Type

Loading...
Name Median Mean
Households$79,411$93,814
Families$90,113$102,548
Married Families$101,544$114,342
Non Families$54,098$64,189
Loading...

Income by Household Type

Thornton Marital Status

Loading...

Marriage Rates

52.7%

Overall Marriage Rate

53.4%

Male Marriage Rate

52.1%

Female Marriage Rate

Thornton Married by Age and Sex

Loading...

Thornton Marriage

The age group where males are most likely to be married is 55-64, while the female age group most likely to be married is 35-44.

Thornton Marital Status by Race

Loading...

Thornton Marital Status

Loading...

7,070

Number of Veterans

6,479

Male Veterans

591

Female Veterans

War Veterans
Vietnam2,251
Second Gulf War1,814
First Gulf War1,759
Korea337
World War II107

Thornton Veterans by War

Loading...
Age Group Veterans
35 to 542,057
65 to 741,710
55 to 641,341
18 to 34991
75+971

Thornton Veterans by Age

Loading...
Name Veterans % of Total
White6,1387.38%
Hispanic1,2194.02%
Black29715.87%
2 or More1955.62%
Asian1552.98%
Other1263.47%
Indian12512.41%
Hawaiian3466.67%

Thornton Veterans by Race

Thornton Veterans by Education

Loading...

2.76%

Veteran Poverty Rate

22.24%

Veteran Disability Rate

Thornton Veterans by Education

Loading...

73.6%

Labor Force Participation

70.9%

Employment Rate

3.6%

Unemployment Rate

Thornton Employment by Age

Loading...

Thornton Employment by Race

Loading...

Thornton Employment by Education

Origin of Non-Citizens

Loading...

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

Origin of Naturalized Citizens

Loading...

51.81%

Born in Colorado

86.61%

Native Born

13.39%

Foreign Born

7.92%

Non Citizen

5.47%

Naturalized

Place of Birth

86.61% of Thornton residents were born in the United States, with 51.81% having been born in Colorado. 7.92% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Thornton Place of Birth

Year Population Growth Annual Growth Rate
2021145,6882,1121.47%
2020143,5762,1121.49%
2019141,4642,1121.52%
2018139,3522,5751.88%
2017136,7772,2031.64%
2016134,5742,3981.81%
2015132,1762,6972.08%
2014129,4792,4571.93%
2013127,0222,6612.14%
2012124,3612,4502.01%
2011121,9112,5202.11%
2010119,39137,0073.78%
200082,38427,3534.12%
199055,03112,9772.73%
198042,05428,72812.18%
197013,3261,9731.62%
196011,3530.00%

Thornton Population by Year