ZIP code 45309: Brookville, OH
ZIP code 45309 is in Brookville (50% of residents) and Trotwood (1.4%), in Montgomery County (99%), Darke County (0.4%), Preble County (0.4%) and Miami County (0.4%), Ohio. 49% of its residents live outside city limits. It is in Ohio's 10th congressional district (99%) and Ohio's 8th congressional district (1.3%). Its state senate districts are State Senate District 5 (99%) and State Senate District 6 (1.4%); its state house districts are State House District 40 (98%), State House District 38 (1.4%) and State House District 80 (0.8%).
City and county
| City or town | Share of ZIP residents |
|---|---|
| Brookville | 50% |
| Trotwood | 1.4% |
| Clayton | 0.9% |
| County | Share of ZIP residents |
|---|---|
| Montgomery County | 99% |
| Darke County | 0.4% |
| Preble County | 0.4% |
| Miami County | 0.4% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Clay township | 66% |
| Perry township | 30% |
| Trotwood city | 1.4% |
| Clayton city | 0.9% |
| Monroe township | 0.4% |
| Harrison township | 0.4% |
| Union township | 0.4% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Ohio's 10th congressional district (OH-10) | 99% |
| Ohio's 8th congressional district (OH-08) | 1.3% |
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-10) | Michael R. Turner (R) | 202-225-6465 | 99% |
| U.S. Representative (OH-08) | Warren Davidson (R) | 202-225-6205 | 1.3% |
| 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) | 99% | |
| State Senator (State Senate District 6) | Willis Blackshear (Democratic) | 1.4% | |
| State Representative (State House District 40) | Rodney Creech (R) | 98% | |
| State Representative (State House District 38) | Desireè Tims (Democratic) | 1.4% | |
| State Representative (State House District 80) | Johnathan Newman (R) | 0.8% |
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
- Brookville website: http://www.brookvilleohio.com/
- Brookville laws: search for the Brookville, Ohio code of ordinances
- Trotwood website: http://www.trotwood.org/
- Trotwood laws: search for the Trotwood, Ohio code of ordinances
- Montgomery County website: https://www.mcohio.org/
- Montgomery County laws: search for the Montgomery County, Ohio code of ordinances
- Darke County laws: search for the Darke County, Ohio code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 5 | 99% |
| State Senate District 6 | 1.4% |
| State house district | Share of ZIP residents |
|---|---|
| State House District 40 | 98% |
| State House District 38 | 1.4% |
| State House District 80 | 0.8% |
Voting precincts
18 voting precincts overlap ZIP 45309. 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:45309")
ZIP 45309 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.