Benton County, Washington
Benton County, Washington, has 221,722 residents (July 2025 estimate). Its county seat is Prosser. It uses Pacific Time and covers 1,700 sq mi (4,403 km²) of land.
- Resident population, July 2025
- 221,722
- Land area
- 1,700 sq mi (4,403 km²)
- County seat or government
- Prosser
- Time zone
- Pacific TimeUTC-08:00 in January; UTC-07:00 in July
- Median household income
- $89,874 ± $2,080
- Median home value
- $407,800 ± $7,426
- Median rent, with utilities
- $1,306 ± $35
- Homes lived in by their owners
- 67.6% ± 1.2 points
- County type
- County
- Metro or micro area
- Kennewick-Richland, WA metro areaCentral county
- Water area
- 59.6 sq mi (154 km²)
- State
- Washington
- County code (FIPS)
- 53005
- Coordinates (central point)
- 46.228125, -119.516659
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Benton County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Pacific TimeAmerica/Los_Angeles | UTC-08:00 in January; UTC-07:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 9933650,735 people
- 9935237,430 people
- 9933733,287 people
- 9935425,559 people
- 9894422,817 people
- 9933820,633 people
- 9935319,251 people
- 9893015,730 people
- 9935014,837 people
- 993209,879 people
- 99346198 people
- 99345162 people
12 ZIP Code areas overlap Benton County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
School districts in Benton County, largest first
- Kennewick School District100,741 people
- Richland School District81,955 people
- Grandview School District15,563 people
- Prosser School District14,634 people
- Kiona-Benton City School District9,270 people
- Finley School District5,061 people
- Paterson School District692 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Kennewick, Washington (city)85,295 people
- Richland, Washington (city)62,753 people
- West Richland, Washington (city)17,586 people
- Prosser, Washington (city)6,305 people
- Finley, Washington (CDP)5,634 people
- Benton City, Washington (city)3,695 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Franklin County, Washington36 mi northeast
- Walla Walla County, Washington50 mi east
- Morrow County, Oregon56 mi south
- Umatilla County, Oregon58 mi southeast
- Yakima County, Washington60 mi west
- Klickitat County, Washington65 mi west
- Grant County, Washington68 mi north
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county where you are now, check its ZIP area, or check the time zone where you are.
Areas that only touch the edge
These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.