Business planning by county
King County, Washington
Use a county reference when organizing a market-research brief, outreach territory or business calculation. County population gives geographic context; it does not measure the number of qualified customers.
Identify the right place
King County is a county or county equivalent in Washington. Its five-digit FIPS code is 53033; preserve the leading zero when storing county codes as text. The Gazetteer lists 191.65 square miles of water and a representative point at 47.490552, -121.833977. That point identifies the geography; it is not a street address or a site boundary.
Open this county in Census data · Download this county as JSON
Business planning by county checklist
- Define who the offer is for before selecting an area.
- Distinguish residents, businesses and potential customers in the calculation.
- Keep source dates and assumptions attached to your working file.
These are geographic reference records, not contact lists or verified sales leads.
Sources and interpretation
Geography: 2025 U.S. Census Gazetteer. Population: Vintage 2025 estimates, July 1, 2025. County equivalents include parishes, boroughs, independent cities and planning regions. Puerto Rico population is not supplied by this population file.
Population is an estimate, not a live count. Gazetteer land and water measures describe the geographic area; they do not measure service availability, households, businesses or market demand. Match the FIPS code and source vintage when joining another dataset.
More county references in Washington
- Jefferson County
Washington · FIPS 53031
33,970 residents · 2025 estimate
- Kitsap County
Washington · FIPS 53035
283,374 residents · 2025 estimate