Boundary Atlas

ZIP code 21046: Columbia, MD

ZIP code 21046 is in Columbia, in Howard County, Maryland. It is in Maryland's 3rd congressional district. Its state senate district is State Senate District 13; its state house district is State Legislative District 13.

16,023residents (2020 Census)
7.8 sq miland area
1cities and towns
1congressional district
3voting precincts

See it on the mapAll of Maryland

City and county

City or townShare of ZIP residents
Columbia100%

CountyShare of ZIP residents
Howard County100%

Town or county subdivisionShare of ZIP residents
District 6, Savage100%

Congressional district

Congressional districtShare of ZIP residents
Maryland's 3rd congressional district (MD-03)100%

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (MD-03)Sarah Elfreth (D)202-225-4016100%
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 13)Guy Guzzone (Democratic)100%
Delegate (State Legislative District 13)Gabriel Moreno (Democratic)100%
Delegate (State Legislative District 13)Jen Terrasa (Democratic)100%
Delegate (State Legislative District 13)Pam Guzzone (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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 13100%

State house districtShare of ZIP residents
State Legislative District 13100%

Voting precincts

3 voting precincts overlap ZIP 21046. 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://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

related_geographies(id="us:zcta:21046")

ZIP 21046 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.