ZIP code 20656: District 3, Leonardtown, MD
ZIP code 20656 is in St. Mary's County, Maryland, outside any city or Census-designated place. It is in Maryland's 5th congressional district. Its state senate district is State Senate District 29; its state house district is State Legislative Subdistrict 29A.
See it on the mapAll of Maryland
City and county
Outside any city or Census-designated place.
| County | Share of ZIP residents |
|---|---|
| St. Mary's County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| District 3, Leonardtown | 100% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Maryland's 5th congressional district (MD-05) | 100% |
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 29 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| State Legislative Subdistrict 29A | 100% |
Voting precincts
1 voting precinct overlap ZIP 20656. 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:20656")
ZIP 20656 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.