County Population

Source: US Census Bureau

Current Estimates

Municipality Census Estimates
  2010 2011 2012 2013 2014 2015
Kittitas County 40,915 41,300 41,500 41,900 42,100 42,670
Unincorporated 18,063 18,315 18,440 18,785 18,890 19,120
Incorporated 22,852 22,985 23,060 23,115 23,210 23,550
Cle Elum 1,872 1,875 1,865 1,870 1,870 1,865
Ellensburg 18,174 18,250 18,320 18,370 18,440 18,810
Kittitas 1,381 1,430 1,450 1,450 1,475 1,455
Roslyn 893 895 895 895 895 890
South Cle Elum 532 535 530 530 530 530

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