Arapahoe County Population 2018

Arapahoe County's estimated population is 643,052 with a growth rate of 0.96% 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
2017643,0526,1030.96%
2016636,9498,1151.29%
2015628,83411,4491.85%
2014617,38510,5461.74%
2013606,83911,7451.97%
2012595,09410,1391.73%
2011584,95510,3051.79%
2010574,650183,13946.78%
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
White490,31376.25%
Black or African American69,60310.82%
Asian36,7195.71%
Two or More Races24,1163.75%
American Indian and Alaska Native6,8181.06%
Native Hawaiian and Other Pacific Islander1,6720.26%

Arapahoe County Population Pyramid

0k5k10k15k20k25k Male Population0k5k10k15k20k25k Female Population8580757065605550454035302520151050
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