County Population

Source: US Census Bureau

Current Estimates

Municipality Census Estimate
  2010 2017
Kittitas County 40,915 44,730
Unincorporated 18,063 20,385
Incorporated 22,852 24,345
Cle Elum 1,872 1,875
Ellensburg 18,174 19,550
Kittitas 1,381 1,500
Roslyn 893 890
South Cle Elum 532 530

Source: Office of Financial Management, State of Washington

Population by Decennial Census: 1900-2010

  United States Washington State Kittitas County
2010 308,745,538 6,724,540 40,915
2000 281,421,906 5,894,121 33,362
1990 248,709,873 4,866,692 26,725
1980 226,545,805 4,132,156 24,877
1970 203,211,926 3,409,169 25,039
1960 179,323,175 2,853,214 20,467
1950 151,325,798 2,378,963 20,230
1930 123,202,624 1,563,396 18,154
1920 106,021,537 1,356,621 17,737
1910 92,228,496 1,141,990 18,561
1900 76,212,168 518,103 9,704

Source: US Census Bureau