ZIP code 21155: District 5, MD
ZIP code 21155 is in Baltimore County (87%) and Carroll County (13%), Maryland, outside any city or Census-designated place. It is in Maryland's 2nd congressional district. Its state senate districts are State Senate District 42 (80%) and State Senate District 10 (20%); its state house districts are State Legislative Subdistrict 42A (67%), State Legislative District 10 (20%) and State Legislative Subdistrict 42C (13%).
See it on the mapAll of Maryland
City and county
Outside any city or Census-designated place.
| County | Share of ZIP residents |
|---|---|
| Baltimore County | 87% |
| Carroll County | 13% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| District 5 | 61% |
| District 4 | 26% |
| District 8, Hampstead | 7.7% |
| District 4, Woolerys | 5.1% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Maryland's 2nd congressional district (MD-02) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MD-02) | Johnny Olszewski, Jr. (D) | 202-225-3061 | 100% |
| 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 42) | Chris West (R) | 80% | |
| State Senator (State Senate District 10) | Ben Brooks (Democratic) | 20% | |
| Delegate (State Legislative Subdistrict 42A) | Alex Harlan (R) | 67% | |
| Delegate (State Legislative District 10) | Adrienne Jones (Democratic) | 410-455-5330 | 20% |
| Delegate (State Legislative District 10) | Jennifer White Holland (Democratic) | 20% | |
| Delegate (State Legislative District 10) | Scott Phillips (Democratic) | 20% | |
| Delegate (State Legislative Subdistrict 42C) | Josh Stonko (R) | 13% |
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
- Baltimore County website: https://www.baltimorecountymd.gov/
- Baltimore County laws: search for the Baltimore County, Maryland code of ordinances
- Carroll County website: https://www.carrollcountymd.gov/
- Carroll County laws: search for the Carroll County, Maryland code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 42 | 80% |
| State Senate District 10 | 20% |
| State house district | Share of ZIP residents |
|---|---|
| State Legislative Subdistrict 42A | 67% |
| State Legislative District 10 | 20% |
| State Legislative Subdistrict 42C | 13% |
Voting precincts
6 voting precincts overlap ZIP 21155. 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:21155")
ZIP 21155 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.