Boundary Atlas

ZIP code 45142: Lynchburg, OH

ZIP code 45142 is in Lynchburg (34% of residents) and St. Martin (3.8%), in Highland County (83%), Clinton County (9.2%) and Brown County (7.6%), Ohio. 62% of its residents live outside city limits. It is in Ohio's 15th congressional district (83%), Ohio's 1st congressional district (9.2%) and Ohio's 2nd congressional district (7.6%). Its state senate districts are State Senate District 17 (83%), State Senate District 10 (9.2%) and State Senate District 14 (7.6%); its state house districts are State House District 91 (83%), State House District 71 (9.2%) and State House District 63 (7.6%).

4,384residents (2020 Census)
61.8 sq miland area
2cities and towns
3congressional districts
9voting precincts

See it on the mapAll of Ohio

City and county

City or townShare of ZIP residents
Lynchburg34%
St. Martin3.8%

CountyShare of ZIP residents
Highland County83%
Clinton County9.2%
Brown County7.6%

Town or county subdivisionShare of ZIP residents
Dodson township55%
Union township14%
Salem township9.9%
Clark township8.1%
Perry township7.6%
Hamer township2.4%
Clay township1.4%
Jefferson township1.2%

Congressional districts

Congressional districtShare of ZIP residents
Ohio's 15th congressional district (OH-15)83%
Ohio's 1st congressional district (OH-01)9.2%
Ohio's 2nd congressional district (OH-02)7.6%

This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.

State legislative districts

State senate districtShare of ZIP residents
State Senate District 1783%
State Senate District 109.2%
State Senate District 147.6%

State house districtShare of ZIP residents
State House District 9183%
State House District 719.2%
State House District 637.6%

Voting precincts

9 voting precincts overlap ZIP 45142. 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:45142")

ZIP 45142 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.