ZIP code 46373: St. John, IN

ZIP code 46373 is in St. John (96% of residents), in Lake County, Indiana. It is in Indiana's 1st congressional district. Its state senate districts are State Senate District 1 (100%) and State Senate District 6 (0.2%); its state house districts are State House District 15 (100%) and State House District 14 (<0.1%).

17,839residents (2020 Census)

10.9 sq miland area

2cities and towns

1congressional district

21voting precincts

See it on the map All of Indiana

City and county

City or town	Share of ZIP residents
St. John	96%
Schererville	0.8%

County	Share of ZIP residents
Lake County	100%

Town or county subdivision	Share of ZIP residents
St. John township	73%
Hanover township	27%

Congressional district

Congressional district	Share of ZIP residents
Indiana's 1st congressional district (IN-01)	100%

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (IN-01)	Frank J. Mrvan (D)	202-225-2461	100%
U.S. Senator	Jim Banks (R)	202-224-4814	statewide
U.S. Senator	Todd Young (R)	202-224-5623 · contact form	statewide
State Senator (State Senate District 1)	Dan Dernulc (R)		100%
State Senator (State Senate District 6)	Rick Niemeyer (R)		0.2%
State Representative (State House District 15)	Hal Slager (R)		100%
State Representative (State House District 14)	Vernon Smith (Democratic)		<0.1%

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

St. John website: https://stjohnin.gov/
St. John laws: search for the St. John, Indiana code of ordinances
Lake County website: http://www.lakecountyin.org
Lake County laws: search for the Lake County, Indiana code of ordinances

State legislative districts

State senate district	Share of ZIP residents
State Senate District 1	100%
State Senate District 6	0.2%

State house district	Share of ZIP residents
State House District 15	100%
State House District 14	<0.1%

Voting precincts

21 voting precincts overlap ZIP 46373. 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:

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ZIP 46373 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.