Boundary Atlas

ZIP code 62301: Quincy, IL

ZIP code 62301 is in Quincy (99% of residents), in Adams County, Illinois. It is in Illinois's 15th congressional district. Its state senate district is State Senate District 50; its state house district is State House District 99.

31,481residents (2020 Census)
11.2 sq miland area
1cities and towns
1congressional district
40voting precincts

See it on the mapAll of Illinois

City and county

City or townShare of ZIP residents
Quincy99%

CountyShare of ZIP residents
Adams County100%

Town or county subdivisionShare of ZIP residents
Quincy township99%
Melrose township0.4%
Ellington township0.1%
Riverside township<0.1%

Congressional district

Congressional districtShare of ZIP residents
Illinois's 15th congressional district (IL-15)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 50100%

State house districtShare of ZIP residents
State House District 99100%

Voting precincts

40 voting precincts overlap ZIP 62301. 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:62301")

ZIP 62301 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.