ZIP code 21031: Cockeysville, MD

ZIP code 21031 is in Cockeysville, in Baltimore County, Maryland. It is in Maryland's 2nd congressional district. Its state senate district is State Senate District 11; its state house district is State Legislative Subdistrict 11B.

11residents (2020 Census)

0.9 sq miland area

1cities and towns

1congressional district

2voting precincts

See it on the map All of Maryland

City and county

City or town	Share of ZIP residents
Cockeysville	100%

County	Share of ZIP residents
Baltimore County	100%

Town or county subdivision	Share of ZIP residents
District 8	100%

Congressional district

Congressional district	Share of ZIP residents
Maryland's 2nd congressional district (MD-02)	100%

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (MD-02)	Johnny Olszewski, Jr. (D)	202-225-3061	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 11)	Shelly Hettleman (Democratic)		100%
Delegate (State Legislative Subdistrict 11B)	Dana Stein (Democratic)		100%
Delegate (State Legislative Subdistrict 11B)	Jon Cardin (Democratic)		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

Cockeysville laws: search for the Cockeysville, Maryland code of ordinances
Baltimore County website: https://www.baltimorecountymd.gov/
Baltimore County laws: search for the Baltimore County, Maryland code of ordinances

State legislative districts

State senate district	Share of ZIP residents
State Senate District 11	100%

State house district	Share of ZIP residents
State Legislative Subdistrict 11B	100%

Voting precincts

2 voting precincts overlap ZIP 21031. 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:21031")

ZIP 21031 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.