ZIP code 20639: Huntingtown, MD

ZIP code 20639 is in Huntingtown (23% of residents), in Calvert County, Maryland. 77% of its residents live outside city limits. It is in Maryland's 5th congressional district. Its state senate district is State Senate District 27; its state house district is State Legislative Subdistrict 27C.

15,344residents (2020 Census)

41.6 sq miland area

2cities and towns

1congressional district

4voting precincts

See it on the map All of Maryland

City and county

City or town	Share of ZIP residents
Huntingtown	23%
Prince Frederick	0.8%

County	Share of ZIP residents
Calvert County	100%

Town or county subdivision	Share of ZIP residents
District 2, Prince Frederick	77%
District 3, Sunderland	23%

Congressional district

Congressional district	Share of ZIP residents
Maryland's 5th congressional district (MD-05)	100%

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (MD-05)	Steny H. Hoyer (D)	202-225-4131	100%
U.S. Senator	Angela D. Alsobrooks (D)	202-224-4524 · contact form	statewide
U.S. Senator	Chris Van Hollen (D)	202-224-4654 · contact form	statewide
State Senator (State Senate District 27)	Kevin Harris (Democratic)		100%
Delegate (State Legislative Subdistrict 27C)	Mark Fisher (R)		100%

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

Huntingtown laws: search for the Huntingtown, Maryland code of ordinances
Calvert County website: http://www.co.cal.md.us/
Calvert County laws: search for the Calvert County, Maryland code of ordinances

State legislative districts

State senate district	Share of ZIP residents
State Senate District 27	100%

State house district	Share of ZIP residents
State Legislative Subdistrict 27C	100%

Voting precincts

4 voting precincts overlap ZIP 20639. 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:

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ZIP 20639 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.