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 126,280 as of July 1, 2015. 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.

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, 2015.

City of Thornton, CO Boundary Map


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Thornton, CO Data & Demographics (As of July 1, 2015)


Total Population 126,280
Population in Households 125,925
Population in Familes 107,432
Population in Group Qrtrs 355
Population Density1 3,624
Diversity Index2 68


Total Households 43,746
Average Household Size 2.88
Family Households 32,297
Average Family Size 3


Total Housing Units 45,307 (100%)
Owner Occupied HU 29,734 (65.6%)
Renter Occupied HU 14,012 (30.9%)
Vacant Housing Units 1,561 ( 3.4%)
Median Home Value $251,213
Average Home Value $268,992


Median Household Income $72,417
Average Household Income $82,604
Per Capita Income $28,421
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 1.17% 1.08%
Households 1.07% 1.05%
Families 1.25% 0.98%
Median Household Income   1.8%
Per Capita Income   2.13%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

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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, 2015 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 Density1 # 22 95th
Diversity Index2 # 65 86th
Median Household Income # 107 77th
Per Capita Income # 215 53rd

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