ZIP code 98040: Mercer Island, WA
ZIP code 98040 is in Mercer Island, in King County, Washington. It is in Washington's 9th congressional district. Its state senate district is Legislative (Senate) District 41; its state house district is Legislative (House) District 41.
See it on the mapAll of Washington
City and county
| City or town | Share of ZIP residents |
|---|---|
| Mercer Island | 100% |
| County | Share of ZIP residents |
|---|---|
| King County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Seattle East CCD | 100% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Washington's 9th congressional district (WA-09) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Salim Nice | 100% | |
| U.S. Representative (WA-09) | Adam Smith (D) | 202-225-8901 | 100% |
| 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 41) | Lisa Wellman (Democratic) | 100% | |
| State Representative (Legislative (House) District 41) | Janice Zahn (Democratic) | 100% | |
| State Representative (Legislative (House) District 41) | My-Linh Thai (Democratic) | 100% |
From Wikidata (community-maintained); confirm on the city's website.
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); Mayors: Wikidata (CC0).
Local government
- Mercer Island website: https://mercerisland.gov
- Mercer Island laws: search for the Mercer Island, Washington code of ordinances
- King County website: https://kingcounty.gov
- King County laws: search for the King County, Washington code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| Legislative (Senate) District 41 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| Legislative (House) District 41 | 100% |
Voting precincts
44 voting precincts overlap ZIP 98040. 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:98040")
ZIP 98040 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.