Boundary Atlas

ZIP code 98837: Moses Lake, WA

ZIP code 98837 is in Moses Lake (55% of residents), Cascade Valley (9.4%) and Moses Lake North (8.8%), in Grant County, Washington. 27% of its residents live outside city limits. It is in Washington's 4th congressional district. Its state senate district is Legislative (Senate) District 13; its state house district is Legislative (House) District 13.

46,262residents (2020 Census)
486.2 sq miland area
4cities and towns
1congressional district
35voting precincts

See it on the mapAll of Washington

City and county

City or townShare of ZIP residents
Moses Lake55%
Cascade Valley9.4%
Moses Lake North8.8%
Wheeler0.2%

CountyShare of ZIP residents
Grant County100%

Town or county subdivisionShare of ZIP residents
Moses Lake CCD85%
Ephrata-Soap Lake CCD6.7%
Gloyd CCD4.9%
George CCD2.2%
Wilson Creek CCD0.6%
Warden CCD<0.1%

Congressional district

Congressional districtShare of ZIP residents
Washington's 4th congressional district (WA-04)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (WA-04)Dan Newhouse (R)202-225-5816100%
U.S. SenatorMaria Cantwell (D)202-224-3441 · contact formstatewide
U.S. SenatorPatty Murray (D)202-224-2621 · contact formstatewide
State Senator (Legislative (Senate) District 13)Judy Warnick (R)100%
State Representative (Legislative (House) District 13)Alex Ybarra (R)100%
State Representative (Legislative (House) District 13)Tom Dent (R)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

State legislative districts

State senate districtShare of ZIP residents
Legislative (Senate) District 13100%

State house districtShare of ZIP residents
Legislative (House) District 13100%

Voting precincts

35 voting precincts overlap ZIP 98837. 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:98837")

ZIP 98837 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.