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Historically, censuses have been taken both by State/Territorial governments as well as the Federal government. Federal censuses have been taken every 10 years while State or Territorial censuses were generally taken between those year spans.

Note: Access to Federal census records is restricted for 72 years after the census is taken. For this reason, census population schedules from 1950 to present are inaccessible to public research at this time.

The following list describes existing King County census enumerations and indexes that are available for free both online and in person.

1857 Territorial Census

1860 Federal Census

1870 Federal Census

1871 Territorial Census

1877-1878 Territorial Census

1879 Territorial Census

1880 Territorial Census

1880 Federal Census

1881 Territorial Census

1883 Territorial Census

1885 Territorial Census

1887 Territorial Census

1889 Territorial Census

1892 State Census

1900 Federal Census

1910 Federal Census

1920 Federal Census

1930 Federal Census

1940 Federal Census

1950 to present, Federal Censuses

Although the original population schedules for these years are restricted from public access, various statistical information can still be obtained from these enumerations. Contact the U.S. Census Bureau for more information:

U.S. Census Bureau*
301-763-INFO (4636)


*external link

TTY Relay 711

The King County Archives building is currently closed, but our remote customer service hours are 9am-4pm, Monday through Friday.