Other pages about the topic: Forecasting & Research

Annexations and municipal boundary changes

Important: If you are conducting a census at this time, please contact OFM at pop.annexations@ofm.wa.gov or 360-902-0599 for special COVID-19 census guidance.

Per RCW 35.13.260 and RCW 35A.14.700, jurisdictions must send annexation paperwork to the Office of Financial Management (OFM) within 30 days of the annexation effective date. OFM approval is necessary for a city to qualify for revenues related to population.

Census 2010 data

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


Data tables

April 1 official population estimates

RCW 43.62.030 states that the Office of Financial Management (OFM) shall annually determine the April 1 populations of all cities and towns of the state.  OFM population estimates for cities and towns are used in state program administration and in the allocation of selected state revenues (RCW 43.62.020).  Population estimates for counties are used to allocate revenues as specified in RCW 36.13.100 and RCW 43.62.030.

Historical estimates of April 1 population and housing for the state, counties, and cities

Intercensal estimates

Intercensal estimates are estimates that are bracketed on both sides by decennial census or state-certified special census counts. As such, they yield a more consistent series than postcensal estimates which only reference the prior census point.

Estimates of April 1 population by age, sex, race and Hispanic origin

OFM 2011 through 2020 estimates are based on 2010 census data. Results from the 2020 Census are not available yet. OFM Small Area Demographic Estimates from 2011 forward will be revised after detailed 2020 Census data are released.

2010 Census 2-page demographic profiles

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.

Census 2000 Summary File 3 data file descriptions

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.