County · code 53005
Benton CountyWashington
Benton County is in Washington, with its seat in Prosser, and was formed on March 8, 1905.
- Founded1905
- County seatProsser
- Named forThomas Hart Benton
- Land area1,700 sq mi + 60 sq mi water
- Population206,873 2020 Census
- Parcels mapped80,216 checked 16 October 2026
Where it is
Benton on the map of Washington
Washington has 39 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1905 from Klickitat County and Yakima County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Benton County was created from Klickitat and Yakima Counties. It was named after Thomas Hart Benton.
- 1905Benton County created Benton created from Klickitat and Yakima. · Wash. Laws 1905, 9th leg. sess., ch. 89/pp. 185-191
Land and parcels
What the maps cover in Benton
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 80,216 parcels from Benton County. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 17 September 2026 · checked 16 October 2026 -
Address points Missing
No public address points layer found for Benton County yet.
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Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Benton by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Who to ask before you build, dig or sell
Official county pages only. We link to them; we do not copy them, because they change.
Inside a city or town, permits usually come from that city rather than the county.
Zoning and code
County government
- County government
The official website of Benton County.
See your own lot on these maps
Open Benton County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Benton County
- When was Benton County founded?
- Benton County was founded in 1905, formed from Klickitat County and Yakima County, and named after Thomas Hart Benton.
- What is the county seat of Benton County?
- The county seat of Benton County is Prosser.
- Is there an online parcel map for Benton County?
- Yes. Benton County publishes a parcel map of 80,216 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Benton County's boundary or name changed?
- Benton County was created in 1905 from Klickitat County and Yakima County. The Atlas of Historical County Boundaries records no boundary change since.
- Who issues building permits in Benton County?
- The county's page on building permits: Building Permits. Inside a city or town, ask that city first.
- Is my lot in a flood zone?
- We do not have flood maps for Benton County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby