ZIP code 45342 is in Miamisburg (53% of residents), in Montgomery County (100%) and Warren County (0.4%), Ohio. 47% of its residents live outside city limits. It is in Ohio's 10th congressional district (100%) and Ohio's 1st congressional district (0.4%). Its state senate districts are State Senate District 5 (53%), State Senate District 6 (46%) and State Senate District 7 (0.4%); its state house districts are State House District 40 (53%), State House District 37 (46%) and State House District 55 (0.4%).
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 district
Share of ZIP residents
State Senate District 5
53%
State Senate District 6
46%
State Senate District 7
0.4%
State house district
Share of ZIP residents
State House District 40
53%
State House District 37
46%
State House District 55
0.4%
Voting precincts
36 voting precincts overlap ZIP 45342.
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:45342")
ZIP 45342 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.