Ada County Population 2018

Ada County's estimated population is 456,849 with a growth rate of 2.83% in the past year according to the most recent United States census data. Ada County is the 1st largest county in Idaho.

Year Population Growth Growth Rate
2017456,84912,5802.83%
2016444,26911,5012.66%
2015432,7687,1411.68%
2014425,6279,5532.30%
2013416,0747,1591.75%
2012408,9157,9201.98%
2011400,9957,5491.92%
2010393,446187,67191.20%
1990205,77532,73918.92%
1980173,03660,80654.18%
1970112,23018,77020.08%
196093,46022,81132.29%
195070,64920,24840.17%
194050,40112,47632.90%
193037,9252,7127.70%
192035,2136,12521.06%
191029,08817,529151.65%
190011,5593,19138.13%
18908,3683,69479.03%
18804,6741,99974.73%
18702,6750.00%

Ada County Population Growth

Population Data via

Ada County Race Data

Race Population Percentage
White400,57287.68%
Two or More Races11,6712.55%
Asian11,2762.47%
Black or African American5,4151.19%
American Indian and Alaska Native3,6320.80%
Native Hawaiian and Other Pacific Islander9010.20%

Ada County Population Pyramid

0k5k10k15k Male Population0k5k10k15k 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