ZIP code 99128: Farmington, WA
ZIP code 99128 is in Farmington (42% of residents), in Whitman County (89%) and Latah County (11%), Washington. 58% of its residents live outside city limits. It is in Washington's 5th congressional district (89%) and Idaho's 1st congressional district (11%). Its state senate districts are Legislative (Senate) District 9 (89%) and State Senate District 6 (11%); its state house districts are Legislative (House) District 9 (89%) and State House District 6 (11%).
See it on the mapAll of Washington
City and county
| City or town | Share of ZIP residents |
|---|---|
| Farmington | 42% |
| County | Share of ZIP residents |
|---|---|
| Whitman County | 89% |
| Latah County | 11% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Garfield-Oakesdale CCD | 72% |
| Tekoa CCD | 17% |
| Potlatch CCD | 11% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Washington's 5th congressional district (WA-05) | 89% |
| Idaho's 1st congressional district (ID-01) | 11% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (WA-05) | Michael Baumgartner (R) | 202-225-2006 | 89% |
| U.S. Representative (ID-01) | Russ Fulcher (R) | 202-225-6611 | 11% |
| U.S. Senator | Maria Cantwell (D) | 202-224-3441 · contact form | statewide |
| U.S. Senator | Patty Murray (D) | 202-224-2621 · contact form | statewide |
| State Senator (Legislative (Senate) District 9) | Mark Schoesler (R) | 89% | |
| State Senator (State Senate District 6) | Dan Foreman (R) | 11% | |
| State Representative (Legislative (House) District 9) | Joe Schmick (R) | 89% | |
| State Representative (Legislative (House) District 9) | Mary Dye (R) | 89% | |
| State Representative (State House District 6) | Brandon Mitchell (R) | 11% | |
| State Representative (State House District 6) | Lori McCann (R) | 208-743-5517 | 11% |
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- Farmington website: http://www.farmingtonwa.com/
- Farmington laws: search for the Farmington, Washington code of ordinances
- Whitman County website: http://www.whitmancounty.org
- Whitman County laws: search for the Whitman County, Washington code of ordinances
- Latah County website: http://www.latah.id.us
- Latah County laws: search for the Latah County, Washington code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| Legislative (Senate) District 9 | 89% |
| State Senate District 6 | 11% |
| State house district | Share of ZIP residents |
|---|---|
| Legislative (House) District 9 | 89% |
| State House District 6 | 11% |
Voting precincts
6 voting precincts overlap ZIP 99128. It also crosses into ID. 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:99128")
ZIP 99128 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.