ZIP code 21220: Middle River, MD
ZIP code 21220 is in Middle River (69% of residents) and Bowleys Quarters (15%), in Baltimore County, Maryland. 16% of its residents live outside city limits. It is in Maryland's 2nd congressional district (81%) and Maryland's 1st congressional district (19%). Its state senate districts are State Senate District 7 (51%), State Senate District 8 (34%) and State Senate District 6 (15%); its state house districts are State Legislative Subdistrict 7A (51%), State Legislative District 8 (34%) and State Legislative District 6 (15%).
See it on the mapAll of Maryland
City and county
| City or town | Share of ZIP residents |
|---|---|
| Middle River | 69% |
| Bowleys Quarters | 15% |
| County | Share of ZIP residents |
|---|---|
| Baltimore County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| District 15 | 100% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Maryland's 2nd congressional district (MD-02) | 81% |
| Maryland's 1st congressional district (MD-01) | 19% |
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 | 81% |
| U.S. Representative (MD-01) | Andy Harris (R) | 202-225-5311 | 19% |
| 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 7) | J.B. Jennings (R) | 410-870-5848 | 51% |
| State Senator (State Senate District 8) | Carl Jackson (Democratic) | 34% | |
| State Senator (State Senate District 6) | Johnny Salling (R) | 15% | |
| Delegate (State Legislative Subdistrict 7A) | Kathy Szeliga (R) | 51% | |
| Delegate (State Legislative Subdistrict 7A) | Ryan Nawrocki (R) | 51% | |
| Delegate (State Legislative District 8) | Harry Bhandari (Democratic) | 410-841-3526 | 34% |
| Delegate (State Legislative District 8) | Kim Ross (Democratic) | 34% | |
| Delegate (State Legislative District 8) | Nick Allen (Democratic) | 34% | |
| Delegate (State Legislative District 6) | Bob Long (R) | 15% | |
| Delegate (State Legislative District 6) | Ric Metzgar (R) | 15% | |
| Delegate (State Legislative District 6) | Robin Grammer (R) | 15% |
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
- Middle River laws: search for the Middle River, Maryland code of ordinances
- Bowleys Quarters laws: search for the Bowleys Quarters, 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 7 | 51% |
| State Senate District 8 | 34% |
| State Senate District 6 | 15% |
| State house district | Share of ZIP residents |
|---|---|
| State Legislative Subdistrict 7A | 51% |
| State Legislative District 8 | 34% |
| State Legislative District 6 | 15% |
Voting precincts
11 voting precincts overlap ZIP 21220. 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:21220")
ZIP 21220 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.