Mercer Island, Washington
Mercer Island is a city in King County, Washington, with 25,748 residents in 2020. 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.
County
| County | Share of residents |
|---|---|
| King County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| Washington's 9th congressional district (WA-09) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| Mayor | Salim Nice | citywide | |
| 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 residents |
|---|---|
| Legislative (Senate) District 41 | 100% |
| State house district | Share of residents |
|---|---|
| Legislative (House) District 41 | 100% |
ZIP codes
Percentages mark ZIPs only partly in Mercer Island: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get Mercer Island's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:5345005")
Mercer Island here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.