Boundary Atlas

ZIP code 20659: District 5, Mechanicsville, MD

ZIP code 20659 is in Golden Beach (15% of residents), Mechanicsville (6.9%) and Charlotte Hall (1.9%), in St. Mary's County (98%) and Charles County (1.7%), Maryland. 76% of its residents live outside city limits. It is in Maryland's 5th congressional district. Its state senate districts are State Senate District 29 (98%) and State Senate District 28 (1.7%); its state house districts are State Legislative Subdistrict 29A (98%) and State Legislative District 28 (1.7%).

24,427residents (2020 Census)
97.0 sq miland area
3cities and towns
1congressional district
5voting precincts

See it on the mapAll of Maryland

City and county

City or townShare of ZIP residents
Golden Beach15%
Mechanicsville6.9%
Charlotte Hall1.9%

CountyShare of ZIP residents
St. Mary's County98%
Charles County1.7%

Town or county subdivisionShare of ZIP residents
District 5, Mechanicsville44%
District 4, Chaptico36%
District 6, Patuxent18%
District 4, Allens Fresh1.7%

Congressional district

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

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (MD-05)Steny H. Hoyer (D)202-225-4131100%
U.S. SenatorAngela D. Alsobrooks (D)202-224-4524 · contact formstatewide
U.S. SenatorChris Van Hollen (D)202-224-4654 · contact formstatewide
State Senator (State Senate District 29)Jack Bailey (R)240-309-423898%
State Senator (State Senate District 28)Arthur Ellis (Democratic)1.7%
Delegate (State Legislative Subdistrict 29A)Matt Morgan (R)98%
Delegate (State Legislative District 28)C.T. Wilson (Democratic)1.7%
Delegate (State Legislative District 28)Debra Davis (Democratic)1.7%
Delegate (State Legislative District 28)Edith Patterson (Democratic)1.7%

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 2998%
State Senate District 281.7%

State house districtShare of ZIP residents
State Legislative Subdistrict 29A98%
State Legislative District 281.7%

Voting precincts

5 voting precincts overlap ZIP 20659. 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:20659")

ZIP 20659 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.