The purpose of this site is to provide a convenient location where federal and state agencies, local governments, organizations, and members of the public can obtain information about annexations. State agencies that use this site include WSDOT Geographic Services, DOR Tax Payer Account Administration, and DOR Property Tax Division.

Posting on this website does not replace reporting to DOR by counties and cities. RCW requirements are still in effect.

Why does my city need Office of Financial Management (OFM) approval for an annexation?

State law, RCW 35.13.260 and RCW 35A.14.700, requires that annexation certificates be approved by OFM before the population and housing in an annexed area can be used for population purposes. All annexations and boundary line adjustments must have a certificate sent to OFM even if there is no population in the area.

Which documents do I need to send to OFM?

The American Community Survey (ACS) is an ongoing survey of the nation's population that provides detailed demographic, housing, social, and economic data—data that used to be collected via the decennial census long form.

1. Census 2020
2. Census 2010
3. Census 2000
4. Census 1990

Click on a tab below to access various 2010 Census data products.

These 2-page demographic profiles are based on the 2010 Census Demographic Profile Summary File product. These general profiles show data for age, sex, race, Hispanic or Latino origin, household relationship, household type, group quarters population, housing occupancy, and housing tenure.

Click on one of the links below to find a 2-page demographic profile for your area of interest.

Population and housing characteristics

This table is a compilation of data from several Summary File 3 tables. Items include Group Quarters Population, Housing Unit Population by Tenure and Structure Type, Average Household Size by Tenure, Housing Unit Occupancy Status, and Occupied Housing Units by Tenure and Structure Type. Each component of this data table is described separately below.