ZIP code 21228: Catonsville, MD
ZIP code 21228 is in Catonsville (75% of residents) and Woodlawn (25%), in Baltimore County (100%) and Baltimore city (0.5%), Maryland. It is in Maryland's 2nd congressional district (56%) and Maryland's 7th congressional district (44%). Its state senate districts are State Senate District 44 (79%), State Senate District 10 (21%) and State Senate District 41 (0.5%); its state house districts are State Legislative Subdistrict 44B (41%), State Legislative Subdistrict 44A (37%), State Legislative District 10 (21%) and State Legislative District 41 (0.5%).
See it on the mapAll of Maryland
City and county
| City or town | Share of ZIP residents |
|---|---|
| Catonsville | 75% |
| Woodlawn | 25% |
| Baltimore | 0.5% |
| Arbutus | 0.1% |
| County | Share of ZIP residents |
|---|---|
| Baltimore County | 100% |
| Baltimore city | 0.5% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| District 1 | 99% |
| Baltimore city | 0.5% |
| District 13 | 0.1% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Maryland's 2nd congressional district (MD-02) | 56% |
| Maryland's 7th congressional district (MD-07) | 44% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MD-02) | Johnny Olszewski, Jr. (D) | 202-225-3061 | 56% |
| U.S. Representative (MD-07) | Kweisi Mfume (D) | 202-225-4741 | 44% |
| 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 44) | Charles Sydnor (Democratic) | 79% | |
| State Senator (State Senate District 10) | Ben Brooks (Democratic) | 21% | |
| State Senator (State Senate District 41) | Dalya Attar (Democratic) | 0.5% | |
| Delegate (State Legislative Subdistrict 44B) | Aletheia McCaskill (Democratic) | 41% | |
| Delegate (State Legislative Subdistrict 44B) | Sheila Ruth (Democratic) | 41% | |
| Delegate (State Legislative Subdistrict 44A) | Eric Ebersole (Democratic) | 37% | |
| Delegate (State Legislative District 10) | Adrienne Jones (Democratic) | 410-455-5330 | 21% |
| Delegate (State Legislative District 10) | Jennifer White Holland (Democratic) | 21% | |
| Delegate (State Legislative District 10) | Scott Phillips (Democratic) | 21% | |
| Delegate (State Legislative District 41) | Malcolm Ruff (Democratic) | 0.5% | |
| Delegate (State Legislative District 41) | Sandy Rosenberg (Democratic) | 410-664-2646 | 0.5% |
| Delegate (State Legislative District 41) | Sean Stinnett (Democratic) | 0.5% |
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
- Catonsville laws: search for the Catonsville, Maryland code of ordinances
- Woodlawn laws: search for the Woodlawn, Maryland code of ordinances
- Baltimore County website: https://www.baltimorecountymd.gov/
- Baltimore County laws: search for the Baltimore County, Maryland code of ordinances
- Baltimore city website: https://www.baltimorecity.gov/
- Baltimore city laws: search for the Baltimore city, Maryland code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 44 | 79% |
| State Senate District 10 | 21% |
| State Senate District 41 | 0.5% |
| State house district | Share of ZIP residents |
|---|---|
| State Legislative Subdistrict 44B | 41% |
| State Legislative Subdistrict 44A | 37% |
| State Legislative District 10 | 21% |
| State Legislative District 41 | 0.5% |
Voting precincts
19 voting precincts overlap ZIP 21228. 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:21228")
ZIP 21228 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.