Black Diamond, Washington
Black Diamond is a city in King County, Washington, with 4,697 residents in 2020. It is in Washington's 8th congressional district. Its state senate district is Legislative (Senate) District 5; its state house district is Legislative (House) District 5.
County
| County | Share of residents |
|---|---|
| King County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| Washington's 8th congressional district (WA-08) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (WA-08) | Kim Schrier (D) | 202-225-7761 | 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 5) | Victoria Hunt (Democratic) | 100% | |
| State Representative (Legislative (House) District 5) | Lisa Callan (Democratic) | 100% | |
| State Representative (Legislative (House) District 5) | Zach Hall (Democratic) | 100% |
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
- Black Diamond laws: search for the Black Diamond, 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 5 | 100% |
| State house district | Share of residents |
|---|---|
| Legislative (House) District 5 | 100% |
ZIP codes
Percentages mark ZIPs only partly in Black Diamond: the share of that ZIP's residents living in it.
- 98010 (82%)
Get this in your AI agent
Your agent can get Black Diamond'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:5306330")
Black Diamond 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.