Boundary Atlas

ZIP code 45341: Crystal Lakes, OH

ZIP code 45341 is in Crystal Lakes (33% of residents), Medway (17%) and Park Layne (3.2%), in Clark County, Ohio. 47% of its residents live outside city limits. It is in Ohio's 4th congressional district (56%) and Ohio's 15th congressional district (44%). Its state senate district is State Senate District 10; its state house district is State House District 74.

3,741residents (2020 Census)
6.4 sq miland area
3cities and towns
2congressional districts
5voting precincts

See it on the mapAll of Ohio

City and county

City or townShare of ZIP residents
Crystal Lakes33%
Medway17%
Park Layne3.2%

CountyShare of ZIP residents
Clark County100%

Town or county subdivisionShare of ZIP residents
Bethel township100%
Mad River townshipland only

Congressional districts

Congressional districtShare of ZIP residents
Ohio's 4th congressional district (OH-04)56%
Ohio's 15th congressional district (OH-15)44%

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 10100%

State house districtShare of ZIP residents
State House District 74100%
State House District 71land only

Voting precincts

5 voting precincts overlap ZIP 45341. 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:45341")

ZIP 45341 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.