Thornton, CO Profile: Facts, Map & Data


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Thornton, Colorado - Basic Facts

The City of Thornton is the 6th largest city in Colorado with a population of 134,889 as of July 1, 2017. Thornton ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Colorado. See peer rankings below.

The primary coordinate point for Thornton is located at latitude 39.9194 and longitude -104.9428 in Adams County. The formal boundaries for the City of Thornton (see map below) encompass a land area of 35.11 sq. miles and a water area of 1.05 sq. miles. Adams County is in the Mountain time zone (GMT -7). The elevation is 5,348 feet.

The City of Thornton (GNIS ID: 2412064) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Colorado is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of Thornton is located within West Adams Division of Adams County.

Beneath the boundary map are tables with Thornton population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

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City of Thornton, CO Boundary Map

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Boundary Maps: West Adams Division | Adams County | Colorado Counties

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Thornton, CO Data & Demographics (As of July 1, 2017)


Total Population 134,889
Daytime Population: Workers 22,531
Daytime Population: Residents 65,099
Total Daytime Population (TDP) 87,630
Ratio TDP/Total Population1 0.65
Population in Households 134,530
Population in Familes 114,687
Population in Group Qrtrs 359
Population Density2 3,842
Diversity Index3 68


Median Household Income $75,365
Average Household Income $88,518
Per Capita Income $30,372


Total Housing Units 47,311 (100%)
Owner Occupied HU 31,969 (67.6%)
Renter Occupied HU 14,573 (30.8%)
Vacant Housing Units 769 ( 1.6%)
Median Home Value $254,434
Average Home Value $270,583


Total Households 46,542
Average Household Size 2.89
Family Households 34,347
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 1.77% 1.27%
Households 1.64% 1.2%
Families 1.76% 1.13%
Median Household Income   1.72%
Per Capita Income   2.46%

Thornton, CO - Peer Comparisons by Rank and Percentile

The table below compares Thornton to the other 458 incorporated cities, towns and CDPs in Colorado by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 6 99th
Population Density # 21 96th
Diversity Index # 60 87th
Median Household Income # 117 75th
Per Capita Income # 200 57th

Additional comparisons and rankings can be made with a VERY EASY TO USE Colorado Census Data Comparison Tool.

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