Boundary Atlas

ZIP code 98531: Centralia, WA

ZIP code 98531 is in Centralia (68% of residents), Fords Prairie (8.4%) and Grand Mound (4.0%), in Lewis County (93%) and Thurston County (7.3%), Washington. 19% of its residents live outside city limits. It is in Washington's 3rd congressional district. Its state senate districts are Legislative (Senate) District 20 (90%) and Legislative (Senate) District 19 (10%); its state house districts are Legislative (House) District 20 (90%) and Legislative (House) District 19 (10%).

26,669residents (2020 Census)
129.2 sq miland area
3cities and towns
1congressional district
30voting precincts

See it on the mapAll of Washington

City and county

City or townShare of ZIP residents
Centralia68%
Fords Prairie8.4%
Grand Mound4.0%

CountyShare of ZIP residents
Lewis County93%
Thurston County7.3%

Town or county subdivisionShare of ZIP residents
Centralia-Chehalis CCD90%
Thurston South CCD7.3%
Logan Hill CCD1.6%
Bunker CCD0.9%

Congressional district

Congressional districtShare of ZIP residents
Washington's 3rd congressional district (WA-03)100%

Members of Congress

OfficeMemberContact
U.S. Representative (WA-03)Marie Gluesenkamp Perez (D)202-225-3536
U.S. SenatorMaria Cantwell (D)202-224-3441 · contact form
U.S. SenatorPatty Murray (D)202-224-2621 · contact form

Members serving now (119th Congress, until January 3, 2027). Source: Members of Congress: the @unitedstates project, congress-legislators (CC0).

State legislative districts

State senate districtShare of ZIP residents
Legislative (Senate) District 2090%
Legislative (Senate) District 1910%

State house districtShare of ZIP residents
Legislative (House) District 2090%
Legislative (House) District 1910%

Voting precincts

30 voting precincts overlap ZIP 98531. Map them, with each precinct's share of the ZIP's residents.

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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:

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ZIP 98531 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.