Washington's 1st congressional district (WA-01)
Washington's 1st congressional district (WA-01) covers parts or all of Snohomish County and King County, and 29 ZIP codes (10 wholly inside it). Its 2020 population was 772,031. This is the map in force for the November 3, 2026 election.
Who represents WA-01
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (WA-01) | Suzan K. DelBene (D) | 202-225-6311 |
| U.S. Senator | Maria Cantwell (D) | 202-224-3441 · contact form |
| U.S. Senator | Patty Murray (D) | 202-224-2621 · contact form |
Officials serving now (members of Congress until January 3, 2027). Sources: Members of Congress: the @unitedstates project, congress-legislators (CC0).
Counties
| County | Share of the county's residents in WA-01 |
|---|---|
| Snohomish County | 56% |
| King County | 14% |
ZIP codes
Percentages mark ZIPs only partly in WA-01: the share of that ZIP's residents inside it.
- 98004 (83%)
- 98005 (45%)
- 98007 (53%)
- 98008 (61%)
- 98011
- 98012
- 98021
- 98028
- 98033
- 98034
- 98036 (59%)
- 98037 (26%)
- 98039
- 98043
- 98052 (97%)
- 98072 (76%)
- 98077 (6.8%)
- 98087 (33%)
- 98201 (0.5%)
- 98204 (31%)
- 98208 (63%)
- 98223 (50%)
- 98252 (1.8%)
- 98258 (99%)
- 98270
- 98271 (61%)
- 98272 (69%)
- 98290 (88%)
- 98296
Towns
Lake Stevens CCD, Marysville CCD, Maltby CCD, Snohomish CCD, Monroe CCD, Arlington CCD, Edmonds CCD, Seattle East CCD, Everett CCD, Granite Falls CCD, Stanwood CCD and Seattle CCD.
Get this in your AI agent
Your agent can draw every precinct in WA-01, or list them with population shares (related_geographies). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
get_boundaries(id="us:congressional_district:5301", children_level="precinct", include_districts=True)