Arapahoe County Population 2017

Arapahoe County's estimated population is 637,068 with a growth rate of 1.24% in the past year according to the most recent United States census data. Arapahoe County is the 3rd largest county in Colorado.

Year Population Growth Growth Rate
2016637,0687,8271.24%
2015629,24110,9341.77%
2014618,30710,6471.75%
2013607,66011,5941.95%
2012596,06610,2301.75%
2011585,83611,0511.92%
2010574,785183,27446.81%
1990391,51197,89033.34%
1980293,621131,47981.09%
1970162,14248,71642.95%
1960113,42661,301117.60%
195052,12519,97562.13%
194032,1509,50341.96%
193022,6478,88164.51%
192013,7663,50334.13%
191010,263-142,754-93.29%
1900153,01720,88215.80%
1890132,13593,491241.93%
188038,64431,815465.88%
18706,8290.00%

Arapahoe County Population Growth

Population Data via

Arapahoe County Race Data

Race Population Percentage
White490,31376.96%
Black or African American69,60310.93%
Asian36,7195.76%
Two or More Races24,1163.79%
American Indian and Alaska Native6,8181.07%
Native Hawaiian and Other Pacific Islander1,6720.26%

Arapahoe County Population Pyramid

0k5k10k15k20k25kArapahoe County Male Population0k5k10k15k20k25kArapahoe County Female Population

Population of Cities in Arapahoe County

City 2010 Census 2016 Estimated Growth Growth Rate
Denver5998646930609319615.54%
Aurora3246843617103702611.40%
Littleton4165146333468211.24%
Englewood3025534050379512.54%
Deer Trail54668113524.73%
Data Sources
  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990