ZIP code 45312: Lostcreek, OH
ZIP code 45312 is in Casstown (19% of residents), in Miami County (98%) and Champaign County (2.1%), Ohio. 81% of its residents live outside city limits. It is in Ohio's 15th congressional district (98%) and Ohio's 4th congressional district (2.1%). Its state senate districts are State Senate District 5 (98%) and State Senate District 12 (2.1%); its state house districts are State House District 80 (98%) and State House District 85 (2.1%).
City and county
| City or town | Share of ZIP residents |
|---|---|
| Casstown | 19% |
| County | Share of ZIP residents |
|---|---|
| Miami County | 98% |
| Champaign County | 2.1% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Lostcreek township | 80% |
| Elizabeth township | 18% |
| Jackson township | 2.1% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Ohio's 15th congressional district (OH-15) | 98% |
| Ohio's 4th congressional district (OH-04) | 2.1% |
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.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (OH-15) | Mike Carey (R) | 202-225-2015 | 98% |
| U.S. Representative (OH-04) | Jim Jordan (R) | 202-225-2676 | 2.1% |
| U.S. Senator | Bernie Moreno (R) | 202-224-2315 | statewide |
| U.S. Senator | Jon Husted (R) | 202-224-3353 | statewide |
| State Senator (State Senate District 5) | Steve Huffman (R) | 98% | |
| State Senator (State Senate District 12) | Susan Manchester (R) | 419-820-8151 | 2.1% |
| State Representative (State House District 80) | Johnathan Newman (R) | 98% | |
| State Representative (State House District 85) | Tim Barhorst (R) | 2.1% |
Elected in 2024 under OH's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).
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
- Casstown laws: search for the Casstown, Ohio code of ordinances
- Miami County laws: search for the Miami County, Ohio code of ordinances
- Champaign County website: http://www.co.champaign.oh.us
- Champaign County laws: search for the Champaign County, Ohio code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 5 | 98% |
| State Senate District 12 | 2.1% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 80 | 98% |
| State House District 85 | 2.1% |
Voting precincts
3 voting precincts overlap ZIP 45312. 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:45312")
ZIP 45312 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.