ZIP code 98303: Anderson Island, WA

ZIP code 98303 is in Anderson Island, in Pierce County, Washington. It is in Washington's 10th congressional district. Its state senate district is Legislative (Senate) District 28; its state house district is Legislative (House) District 28.

1,302residents (2020 Census)

7.9 sq miland area

1cities and towns

1congressional district

1voting precincts

See it on the map All of Washington

City and county

City or town	Share of ZIP residents
Anderson Island	100%

County	Share of ZIP residents
Pierce County	100%

Town or county subdivision	Share of ZIP residents
Key Peninsula-Anderson Island CCD	100%

Congressional district

Congressional district	Share of ZIP residents
Washington's 10th congressional district (WA-10)	100%

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (WA-10)	Marilyn Strickland (D)	202-225-9740	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 28)	T'wina Nobles (Democratic)		100%
State Representative (Legislative (House) District 28)	Dan Bronoske (Democratic)		100%
State Representative (Legislative (House) District 28)	Mari Leavitt (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

Anderson Island laws: search for the Anderson Island, Washington code of ordinances
Pierce County website: https://piercecountywa.gov
Pierce County laws: search for the Pierce County, Washington code of ordinances

State legislative districts

State senate district	Share of ZIP residents
Legislative (Senate) District 28	100%

State house district	Share of ZIP residents
Legislative (House) District 28	100%

Voting precincts

1 voting precinct overlap ZIP 98303. 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:98303")

ZIP 98303 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.