Boundary Atlas

ZIP code 21044: Columbia, MD

ZIP code 21044 is in Columbia (97% of residents), in Howard County, Maryland. It is in Maryland's 3rd congressional district. Its state senate districts are State Senate District 12 (89%), State Senate District 13 (9.8%) and State Senate District 9 (1.6%); its state house districts are State Legislative Subdistrict 12A (89%), State Legislative District 13 (9.8%) and State Legislative Subdistrict 9A (1.6%).

44,284residents (2020 Census)
11.9 sq miland area
1cities and towns
1congressional district
10voting precincts

See it on the mapAll of Maryland

City and county

City or townShare of ZIP residents
Columbia97%

CountyShare of ZIP residents
Howard County100%

Town or county subdivisionShare of ZIP residents
District 5, Clarksville100%

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 12)Clarence Lam (Democratic)89%
State Senator (State Senate District 13)Guy Guzzone (Democratic)9.8%
State Senator (State Senate District 9)Katie Hester (Democratic)1.6%
Delegate (State Legislative Subdistrict 12A)Jessica Feldmark (Democratic)89%
Delegate (State Legislative Subdistrict 12A)Terri Hill (Democratic)89%
Delegate (State Legislative District 13)Gabriel Moreno (Democratic)9.8%
Delegate (State Legislative District 13)Jen Terrasa (Democratic)9.8%
Delegate (State Legislative District 13)Pam Guzzone (Democratic)9.8%
Delegate (State Legislative Subdistrict 9A)Chao Wu (Democratic)1.6%
Delegate (State Legislative Subdistrict 9A)Natalie Ziegler (Democratic)1.6%

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 1289%
State Senate District 139.8%
State Senate District 91.6%

State house districtShare of ZIP residents
State Legislative Subdistrict 12A89%
State Legislative District 139.8%
State Legislative Subdistrict 9A1.6%

Voting precincts

10 voting precincts overlap ZIP 21044. Map them, with each precinct's share of the ZIP's residents.

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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:21044")

ZIP 21044 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.