Prosser, Washington
| Prosser | |
|---|---|
| Benton County court house in Prosser | |
| Location of Prosser, Washington | |
| Coordinates: 46°12′42″N 119°45′10″W / 46.21167°N 119.75278°W | |
| Country | United States | 
| State | Washington | 
| County | Benton | 
| Incorporated | 1899 | 
| Government | |
| • Type | Mayor–council | 
| Area | |
|  • Total | 4.79 sq mi (12.39 km2) | 
| • Land | 4.66 sq mi (12.06 km2) | 
| • Water | 0.13 sq mi (0.33 km2) | 
| Elevation | 663 ft (202 m) | 
| Population  (2020) | |
|  • Total | 6,062 | 
|  • Estimate  (2022) | 6,242 | 
| • Density | 1,369.98/sq mi (528.96/km2) | 
| Time zone | UTC-8 (Pacific (PST)) | 
| • Summer (DST) | UTC-7 (PDT) | 
| ZIP code | 99350 | 
| Area code | 509 | 
| FIPS code | 53-56450 | 
| GNIS feature ID | 2411497 | 
| Website | cityofprosser.com | 
Prosser (/ˈprɑːsər/) is a city in and the county seat of Benton County, Washington, United States. Situated along the Yakima River, it had a population of 6,062 at the 2020 census.