Boundary Atlas

ZIP code 99349: Mattawa, WA

ZIP code 99349 is in Mattawa (42% of residents) and Desert Aire (29%), in Grant County, Washington. 29% of its residents live outside city limits. It is in Washington's 4th congressional district. Its state senate districts are Legislative (Senate) District 13 (83%) and Legislative (Senate) District 16 (17%); its state house districts are Legislative (House) District 13 (83%) and Legislative (House) District 16 (17%).

7,960residents (2020 Census)
267.4 sq miland area
2cities and towns
1congressional district
5voting precincts

See it on the mapAll of Washington

City and county

City or townShare of ZIP residents
Mattawa42%
Desert Aire29%

CountyShare of ZIP residents
Grant County100%

Town or county subdivisionShare of ZIP residents
Mattawa-Royal City CCD100%

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)83%
State Senator (Legislative (Senate) District 16)Perry Dozier (R)17%
State Representative (Legislative (House) District 13)Alex Ybarra (R)83%
State Representative (Legislative (House) District 13)Tom Dent (R)83%
State Representative (Legislative (House) District 16)Mark Klicker (R)17%
State Representative (Legislative (House) District 16)Skyler Rude (R)17%

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 1383%
Legislative (Senate) District 1617%

State house districtShare of ZIP residents
Legislative (House) District 1383%
Legislative (House) District 1617%

Voting precincts

5 voting precincts overlap ZIP 99349. 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:

related_geographies(id="us:zcta:99349")

ZIP 99349 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.