Boundary Atlas

ZIP code 45404: Dayton, OH

ZIP code 45404 is in Dayton (64% of residents) and Riverside (36%), in Montgomery County, Ohio. It is in Ohio's 10th congressional district. Its state senate district is State Senate District 6; its state house districts are State House District 36 (79%) and State House District 38 (21%).

10,730residents (2020 Census)
7.6 sq miland area
2cities and towns
1congressional district
11voting precincts

See it on the mapAll of Ohio

City and county

City or townShare of ZIP residents
Dayton64%
Riverside36%

CountyShare of ZIP residents
Montgomery County100%

Town or county subdivisionShare of ZIP residents
Dayton city64%
Riverside city36%

Congressional district

Congressional districtShare of ZIP residents
Ohio's 10th congressional district (OH-10)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 6100%

State house districtShare of ZIP residents
State House District 3679%
State House District 3821%

Voting precincts

11 voting precincts overlap ZIP 45404. 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:45404")

ZIP 45404 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.