Thornton, Colorado

Thornton: The seventh most populous city in Colorado. It is located in the northeastern part of the state. Thornton is known for its many parks and green spaces, its many historical sites, and its many attractions, such as the Thornton Historical Society and the Thornton Town Center.


Thornton is a city located in the county of Adams in the U.S. state of Colorado. Its population at the 2010 census was 118,772. After 10 years in 2020 city had an estimated population of 148,113 inhabitants.

The city was created 68 years ago in 1956.

Thornton is a city located in Adams County in the Denver metropolitan area. With over 148,000 residents, Thornton is the sixth most populous city in the state of Colorado. The city is situated northeast of Denver.


The Thornton area was first inhabited by American Indians such as the Arapahoe. Settlers later arrived to farm the land in the late 19th century. In 1953, Thornton was incorporated as a city covering only 2 square miles.

Rapid suburban development occurred from the 1970s through the 1990s as Denver expanded. Farms and rural areas quickly gave way to housing, retail centers, and infrastructure to accommodate growth.

Economy and Attractions

Major economic drivers include:

  • Numerous shopping centers like Thornton Town Center
  • Major healthcare networks such as North Suburban Medical Center
  • Agricultural processing and manufacturing facilities
  • Adams County Fairgrounds and Regional Park

Parks and open spaces like Margaret Carpenter Recreation Center provide recreation like baseball fields, a golf course, and swimming pools.


Thornton residents are predominantly white and Hispanic or Latino. However, Thornton has large African American and Asian American communities as well. About 22% of residents are foreign-born.

Overall, Thornton offers diversity and economic opportunity convenient to Denver but with a more suburban community feel.

Thornton locator map
Location of Thornton on Colorado map.

Quick Facts about Thornton

Population : 148,113 (2020)
Country : United States of America
State : Colorado (United States)
County : Adams County
Water as percent of area : 3.08%
Land as percent of area : 96.92%
Altitude : 5,351 feet / 1631 meters
Establishment : June 06, 1956 (68 years ago)
Time Zone : Mountain Time Zone
Local time : 20:20:08 (15th July 2024)
Postal code : 80241
Population growth : 19.81% (2010-2020)
Thornton  CO  welcome sign IMG 5209 image
Thornton CO welcome sign IMG 5209
Thornton  CO  welcome sign IMG 5209 image


Thornton is located at 39°52'5"N 104°58'19"W (39.8680400, -104.9719200).

Thornton map


The population of Thornton increased by 19.81% in 10 years.

Year Population % Change Method
2010 118,772 - census
2011 121,911 2.57% estimation process
2012 124,361 1.97% estimation process
2013 127,022 2.09% estimation process
2014 129,479 1.9% estimation process
2015 132,176 2.04% estimation process
2016 134,574 1.78% estimation process
2017 136,777 1.61% estimation process
2018 139,352 1.85% estimation process
2019 141,464 1.49% estimation process
2020 148,113 4.49% estimation process

Thornton zip code is 80241. County name: Adams, County fips: 08001

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People born in Thornton (10)

People born in Thornton, including artist John Balistreri, National Women's Soccer League defender and former US national team member Nikki Marshall, boxer Adrian Mora, .


  • Edward Casso (American politician) he was born in 03/03/1948
  • Kyle Sleeth (American baseball player) he was born in 20/12/1981
  • Josh Bredl (American professional wrestler) he was born in 28/01/1991
  • Logan Hitzeman (American soccer player) he was born in 02/06/2001
  • Abraham Rodriguez (soccer player) he was born in 19/06/2002
  • Billy Gonzales (American football player and coach) he was born in 18/07/1971
  • Clint Baumstark (American soccer player) he was born in 09/01/1983

Schools in Thornton

College & universities near Thornton, CO

Code Name City ZIP
127787 Altierus Career College-Thornton Thornton (CO) 80229-4339
404912 Pima Medical Institute-Denver Denver (CO) 80221
454847 National Beauty College Denver (CO) 80221
128337 Empire Beauty School-Thornton Thornton (CO) 80233
482440 DeVry University-Colorado Westminster (CO) 80234

Stations (12)

Amtrak & bus stations near Thornton, CO

Code Name Address Type
DEB Denver (Bus Station), Colorado 1055 19th Street BUS
DEN Union Station 1701 Wynkoop Street RAIL
BLD Boulder, Colorado 30th & Diagonal Highway BUS
LGM Longmont, Colorado 623 Main St. BUS
PJT Pine Junction, CO 76 Mount Evans Boulevard BUS

Post offices near Thornton

Post Office Name City ZIP
Thornton Post Office Thornton (CO) 80229
Northview Post Office Northglenn (CO) 80234
Dupon Post Office Commerce City (CO) 80022
North Post Office Denver (CO) 80221
Northglenn Post Office Northglenn (CO) 80233

Other places with the same name (6)

  • Thornton , New Hampshire town in Grafton County, New Hampshire, United States with a population of 2,553 people.
  • Thornton , Illinois village in Cook County, Illinois, USA with a population of 2,367 people.
  • Thornton , Texas town in Limestone County, Texas with a population of 524 people.
  • Thornton , Iowa human settlement in Cerro Gordo County, Iowa, United States of America with a population of 401 people.
  • Thornton , Arkansas city in Calhoun County, Arkansas, United States with a population of 375 people.

Other cities in Adams County

Cities, towns, neighborhoods & other populated places in Adams County , CO.

City Name Population Title
Aurora 387,377 The third most populous city in Colorado and the center of the Denver metropolitan area.
Westminster 115,046 The most populous city in Adams County, Colorado.
Commerce City 60,336 The most populous city in Adams County, Colorado.
Brighton 40,783 A city in Adams County, Colorado.
Northglenn 38,845 City in Colorado
Sherrelwood 18,287 Census-designated place in Adams County, Colorado
Welby 14,846 Census-designated place in Colorado
Lone Tree 13,614 City in Douglas County, Colorado, United States of America
Federal Heights 13,598 City in Adams County, Colorado, United States
Berkley 11,207 Census designated place
Twin Lakes 6,101 City in Freeborn County, Minnesota, United States of America
Todd Creek 3,768 Census-designated place in Adams County, Colorado
Bennett 3,017 Town in Colorado

Distance to Other Cities

Thornton distances to largest Colorado cities