Boundary Atlas

ZIP code 62443: Mason, IL

ZIP code 62443 is in Mason (20% of residents), in Effingham County (92%) and Clay County (8.2%), Illinois. 80% of its residents live outside city limits. It is in Illinois's 12th congressional district. Its state senate districts are State Senate District 55 (96%) and State Senate District 54 (3.5%); its state house districts are State House District 110 (96%) and State House District 107 (3.5%).

1,589residents (2020 Census)
77.7 sq miland area
1cities and towns
1congressional district
5voting precincts

See it on the mapAll of Illinois

City and county

City or townShare of ZIP residents
Mason20%

CountyShare of ZIP residents
Effingham County92%
Clay County8.2%

Town or county subdivisionShare of ZIP residents
Mason township49%
Union township20%
West township19%
Blair township8.2%
Jackson township3.5%

Congressional district

Congressional districtShare of ZIP residents
Illinois's 12th congressional district (IL-12)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (IL-12)Mike Bost (R)202-225-5661100%
U.S. SenatorRichard J. Durbin (D)202-224-2152 · contact formstatewide
U.S. SenatorTammy Duckworth (D)202-224-2854 · contact formstatewide
State Senator (State Senate District 55)Jason Plummer (R)618-283-300096%
State Senator (State Senate District 54)Steve McClure (R)217-960-07883.5%
State Representative (State House District 110)Blaine Wilhour (R)96%
State Representative (State House District 107)Brad Halbrook (R)217-342-02203.5%

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
State Senate District 5596%
State Senate District 543.5%

State house districtShare of ZIP residents
State House District 11096%
State House District 1073.5%

Voting precincts

5 voting precincts overlap ZIP 62443. 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 62443 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.