Thornton, Colorado Population 2020

143,890
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Thornton is a city located in Colorado. With a 2020 population of 143,890, it is the 6th largest city in Colorado and the 187th largest city in the United States. Thornton is currently growing at a rate of 1.57% annually and its population has increased by 21.15% since the most recent census, which recorded a population of 118,772 in 2010. Spanning over 38 miles, Thornton has a population density of 4,009 people per square mile.

The average household income in Thornton is $90,680 with a poverty rate of 8.87%. The median rental costs in recent years comes to $1,398 per month, and the median house value is $290,100. The median age in Thornton is 33.6 years, 32.5 years for males, and 34.4 years for females. For every 100 females there are 99.8 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: 86.16%
  • Asian: 4.59%
  • Two or more races: 3.68%
  • Other race: 2.57%
  • Black or African American: 1.82%
  • Native American: 1.10%
  • Native Hawaiian or Pacific Islander: 0.09%
The current population of Thornton, Colorado is 143,890, based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 139,436.The last official US Census in 2010 recorded the population at 118,772.

Thornton, Colorado Population 2020

Population by Race

Race Population Percentage
White115,95986.16%
Asian6,1824.59%
Two or More Races4,9483.68%
Some Other Race3,4532.57%
Black or African American2,4461.82%
American Indian and Alaska Native1,4801.10%
Native Hawaiian and Other Pacific Islander1200.09%
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Thornton Population Pyramid 2020

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Thornton Median Age

33.6


Total

32.5


Male

34.4


Female

Thornton Adults

There are 96,429 adults, (11,807 of whom are seniors) in Thornton.

Thornton Age Dependency

59

Age Dependency Ratio

14

Old Age Dependency Ratio

45.1

Child Dependency Ratio

Thornton Sex Ratio

Female

67,355

50.05%

Male

67,233

49.95%

Thornton Households and Families

Thornton Renter vs Owner Occupied by Household Type

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Thornton Household Types

Type Owner Renter
Married82.3%17.7%
All71.3%28.7%
Male61.7%38.3%
Female58.4%41.6%
Non Family57.3%42.7%

71.3%

Rate of Home Ownership

Type Count Average Size Owned
All44,745371.3
Married24,3243.6282.3
Non Family12,1771.3857.3
Female5,5103.4558.4
Male2,7343.7561.7

3.48

Average Family Size

3

Average Household Size

7.1%

Unmarried (Opposite Sex)

0.5%

Unmarried (Same Sex)

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Thornton Education

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Education Attained Count Percentage
Less Than 9th Grade4,6875.46%
9th to 12th Grade6,1197.13%
High School Graduate23,19027.01%
Some College19,51922.74%
Associates Degree8,0699.40%
Bachelors Degree17,04719.86%
Graduate Degree7,2138.40%
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Thornton Educational Attainment by Race

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Name Total High School Bachelors
White54,22951,78518,908
Hispanic24,19416,8872,594
Asian4,0443,2271,660
Other Race2,2101,575250
Multiple Races2,1181,955697
Black1,5711,430456
Native American1,07886985
Islander12012046

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 41.05%.

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Name Average Male Female
Overall$43,843$51,701$36,859
Less Than High School$28,598$35,317$19,674
High School Grad$37,619$43,667$30,622
Some College$43,562$53,732$35,779
Bachelors Degree$55,138$66,934$46,927
Graduate Degree$68,073$86,818$60,123

$43,843

Average Earnings

$51,701

Average Male

$36,859

Average Female

Thornton Language

Thornton Language by Age

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Thornton Language

77.18% of Thornton residents speak only English, while 22.82% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 16.96% of the population.

Thornton Poverty

Thornton Poverty by Race

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Name Total In Poverty Poverty Rate
Hispanic45,3056,80715.02%
White76,5433,8164.99%
Asian6,1555478.89%
Multiple4,9284348.81%
Black2,40039716.54%
Other3,44735710.36%
Native1,459835.69%

8.87%

Overall Poverty Rate

8.06%

Male Poverty Rate

9.69%

Female Poverty Rate

Poverty in Thornton

The race most likely to be in poverty in Thornton is Black, with 16.54% below the poverty level.

The race least likely to be in poverty in Thornton is White, with 4.99% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.35%. Among those working part-time, it was 11.83%, and for those that did not work, the poverty rate was 15.30%.

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Name Poverty
Less Than High School17.16%
High School6.96%
Some College6.94%
Bachelors or Greater2.45%
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Name Poverty
Male Unemployed26.56%
Female Unemployed23.26%
Female Employed5.77%
Male Employed3.77%

Thornton Income

Thornton Income by Household Type

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Name Median Mean
Households$76,236$90,680
Families$84,146$98,612
Married Families$97,402$111,203
Non Families$51,566$62,171
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Thornton Marital Status

Thornton Marital Status

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Marriage Rates

51.9%

Overall Marriage Rate

52.8%

Male Marriage Rate

51.0%

Female Marriage Rate

Thornton Married by Age and Sex

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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

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Thornton Veterans

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6,813

Number of Veterans

6,152

Male Veterans

661

Female Veterans

War Veterans
Vietnam2,068
First Gulf War1,971
Second Gulf War1,473
Korea345
World War II216
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Age Group Veterans
35 to 542,203
65 to 741,577
55 to 641,289
75+914
18 to 34830
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Name Veterans % of Total
White5,9457.14%
Hispanic9693.31%
Black29916.67%
Asian1513.21%
2 or More1304.68%
Other1174.41%
Indian1059.43%
Hawaiian6655.00%

Thornton Veterans by Education

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1.32%

Veteran Poverty Rate

23.44%

Veteran Disability Rate

Thornton Employment Status

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74.1%

Labor Force Participation

71.3%

Employment Rate

3.7%

Unemployment Rate

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Origin of Non-Citizens

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

Origin of Naturalized Citizens

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52.54%

Born in Colorado

87.04%

Native Born

12.96%

Foreign Born

8.02%

Non Citizen

Place of Birth

87.04% of Thornton residents were born in the United States, with 52.54% having been born in Colorado. 8.02% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Year Population Growth Annual Growth Rate
2020143,8902,2271.57%
2019141,6632,2271.60%
2018139,4362,4911.82%
2017136,9452,2271.65%
2016134,7182,4171.83%
2015132,3012,7172.10%
2014129,5842,4881.96%
2013127,0962,6962.17%
2012124,4002,4812.03%
2011121,9192,5282.12%
2010119,39137,0073.78%
200082,38427,3534.12%
199055,03112,9772.73%
198042,05428,72812.18%
197013,3261,9731.62%
196011,3530.00%