ZIP code 21133: Randallstown, MD
ZIP code 21133 is in Randallstown (94% of residents) and Milford Mill (4.2%), in Baltimore County, Maryland. It is in Maryland's 2nd congressional district (96%) and Maryland's 7th congressional district (4.2%). Its state senate districts are State Senate District 10 (100%) and State Senate District 11 (0.4%); its state house districts are State Legislative District 10 (100%) and State Legislative Subdistrict 11A (0.4%).
See it on the mapAll of Maryland
City and county
| City or town | Share of ZIP residents |
|---|---|
| Randallstown | 94% |
| Milford Mill | 4.2% |
| Owings Mills | 0.2% |
| County | Share of ZIP residents |
|---|---|
| Baltimore County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| District 2 | 100% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Maryland's 2nd congressional district (MD-02) | 96% |
| Maryland's 7th congressional district (MD-07) | 4.2% |
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 | 96% |
| U.S. Representative (MD-07) | Kweisi Mfume (D) | 202-225-4741 | 4.2% |
| 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 10) | Ben Brooks (Democratic) | 100% | |
| State Senator (State Senate District 11) | Shelly Hettleman (Democratic) | 0.4% | |
| Delegate (State Legislative District 10) | Adrienne Jones (Democratic) | 410-455-5330 | 100% |
| Delegate (State Legislative District 10) | Jennifer White Holland (Democratic) | 100% | |
| Delegate (State Legislative District 10) | Scott Phillips (Democratic) | 100% | |
| Delegate (State Legislative Subdistrict 11A) | Cheryl Pasteur (Democratic) | 0.4% |
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
- Randallstown laws: search for the Randallstown, Maryland code of ordinances
- Milford Mill laws: search for the Milford Mill, 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 10 | 100% |
| State Senate District 11 | 0.4% |
| State house district | Share of ZIP residents |
|---|---|
| State Legislative District 10 | 100% |
| State Legislative Subdistrict 11A | 0.4% |
Voting precincts
13 voting precincts overlap ZIP 21133. 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:21133")
ZIP 21133 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.