ZIP code 99345: Benton County, WA
ZIP code 99345 is in Benton County, Washington, outside any city or Census-designated place. It is in Washington's 4th congressional district. Its state senate district is Legislative (Senate) District 14; its state house district is Legislative (House) District 14.
See it on the mapAll of Washington
City and county
Outside any city or Census-designated place.
| County | Share of ZIP residents |
|---|---|
| Benton County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| South Benton CCD | 100% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Washington's 4th congressional district (WA-04) | 100% |
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| Legislative (Senate) District 14 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| Legislative (House) District 14 | 100% |
Voting precincts
1 voting precinct overlap ZIP 99345. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:99345")
ZIP 99345 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.