April 1 official population estimates
The Office of Financial Management's (OFM) April 1 population determinations are used in many programs for revenue distribution and for program administration. This site and the annexations and municipal boundary changes site contain the most current OFM official figures for program administration and funding.
April 1, 2011 press release and data products
Please note that OFM's 2011 population estimates are based on Census 2010 results or 2010 special censuses conducted by cities. The decennial census counts may not match federal census values because OFM uses city boundaries that include annexations that occurred from January 2, 2010 to April 1, 2010. The decennial counts are from the Public Law 94-171 file. OFM's April 1, 2011, population estimates are based on OFM adjusted Census 2010 values.
- Press release | PDF
- April 1, 2011 population of cities, towns, and counties used for the allocation of selected state revenues PDF | Excel
- Rank of cities and towns by population size and population change, with change due to annexation, April 1, 2010 to April 1, 2011 PDF | Excel
- Rank of cities and towns by percent population change, with change due to annexation, April 1, 2010 to April 1, 2011 PDF | Excel
- Alphabetical listing of cities and towns with population for April 1, 2011 PDF | Excel
- Population Trends for Washington State PDF
- Growth Management Act population change PDF | Excel
- Summary of changes to 2010 federal census due to annexations and special city censuses PDF
- April 1 housing units: 2010 to 2011 PDF | Excel
- April 1 population of cities, towns, and counties: 2000 to 2010 Excel
- April 1 housing units by structure type: 2000 to 2010
- Intercensal estimates of April 1 population and housing for the state, counties, and cities
- Annexations, incorporations, and other municipal boundary changes: April 2, 2000-April 1, 2010 and April 2, 2010-April 1, 2011 PDF | Excel (update coming soon)
Technical documentation
- Census 2000 adjustments
- Notes on Census 2000 corrections and differences between federal census counts and official estimates by OFM
- Adjusted 2000 population and housing by structure type and group quarters for the state, counties, cities, and towns (includes occupancy rates and household size)
- Information about methods and accuracy
