Boundary Atlas

ZIP code 46121: Heritage Lake, IN

ZIP code 46121 is in Heritage Lake (49% of residents), Coatesville (11%) and Amo (1.1%), in Putnam County (63%) and Hendricks County (37%), Indiana. 39% of its residents live outside city limits. It is in Indiana's 4th congressional district. Its state senate districts are State Senate District 24 (96%) and State Senate District 37 (4.3%); its state house districts are State House District 44 (63%) and State House District 28 (37%).

5,090residents (2020 Census)
55.3 sq miland area
4cities and towns
1congressional district
9voting precincts

See it on the mapAll of Indiana

City and county

City or townShare of ZIP residents
Heritage Lake49%
Coatesville11%
Amo1.1%
Groveland0.5%

CountyShare of ZIP residents
Putnam County63%
Hendricks County37%

Town or county subdivisionShare of ZIP residents
Floyd township55%
Clay township27%
Franklin township7.5%
Jefferson township4.3%
Marion township3.4%
Marion township3.2%

Congressional district

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 2496%
State Senate District 374.3%

State house districtShare of ZIP residents
State House District 4463%
State House District 2837%

Voting precincts

9 voting precincts overlap ZIP 46121. 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:46121")

ZIP 46121 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.