Boundary Atlas

ZIP code 21865: Tyaskin, MD

ZIP code 21865 is in Tyaskin (46% of residents) and Bivalve (5.7%), in Wicomico County, Maryland. 48% of its residents live outside city limits. It is in Maryland's 1st congressional district. Its state senate district is State Senate District 37; its state house district is State Legislative Subdistrict 37B.

439residents (2020 Census)
18.4 sq miland area
2cities and towns
1congressional district
1voting precincts

See it on the mapAll of Maryland

City and county

City or townShare of ZIP residents
Tyaskin46%
Bivalve5.7%

CountyShare of ZIP residents
Wicomico County100%

Town or county subdivisionShare of ZIP residents
District 17, Westside100%

Congressional district

Congressional districtShare of ZIP residents
Maryland's 1st congressional district (MD-01)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (MD-01)Andy Harris (R)202-225-5311100%
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 37)Johnny Mautz (R)410-829-2524100%
Delegate (State Legislative Subdistrict 37B)Chris Adams (R)100%
Delegate (State Legislative Subdistrict 37B)Tom Hutchinson (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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 37100%

State house districtShare of ZIP residents
State Legislative Subdistrict 37B100%

Voting precincts

1 voting precinct overlap ZIP 21865. 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:21865")

ZIP 21865 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.