ZIP code 21797: District 4, Lisbon, MD
ZIP code 21797 is in Lisbon (3.1% of residents) and Eldersburg (1.7%), in Howard County (65%), Carroll County (34%) and Montgomery County (0.5%), Maryland. 95% of its residents live outside city limits. It is in Maryland's 3rd congressional district (99%), Maryland's 8th congressional district (0.5%) and Maryland's 2nd congressional district (0.4%). Its state senate districts are State Senate District 9 (65%), State Senate District 5 (34%) and State Senate District 14 (0.5%); its state house districts are State Legislative Subdistrict 9A (65%), State Legislative District 5 (34%) and State Legislative District 14 (0.5%).
See it on the mapAll of Maryland
City and county
| City or town | Share of ZIP residents |
|---|---|
| Lisbon | 3.1% |
| Eldersburg | 1.7% |
| County | Share of ZIP residents |
|---|---|
| Howard County | 65% |
| Carroll County | 34% |
| Montgomery County | 0.5% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| District 4, Lisbon | 65% |
| District 14, Berrett | 32% |
| District 13, Mount Airy | 1.3% |
| District 1 | 0.5% |
| District 9, Franklin | 0.4% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| Maryland's 3rd congressional district (MD-03) | 99% |
| Maryland's 8th congressional district (MD-08) | 0.5% |
| Maryland's 2nd congressional district (MD-02) | 0.4% |
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-03) | Sarah Elfreth (D) | 202-225-4016 | 99% |
| U.S. Representative (MD-08) | Jamie Raskin (D) | 202-225-5341 | 0.5% |
| U.S. Representative (MD-02) | Johnny Olszewski, Jr. (D) | 202-225-3061 | 0.4% |
| 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 9) | Katie Hester (Democratic) | 65% | |
| State Senator (State Senate District 5) | Justin Ready (R) | 34% | |
| State Senator (State Senate District 14) | Craig Zucker (Democratic) | 0.5% | |
| Delegate (State Legislative Subdistrict 9A) | Chao Wu (Democratic) | 65% | |
| Delegate (State Legislative Subdistrict 9A) | Natalie Ziegler (Democratic) | 65% | |
| Delegate (State Legislative District 5) | April Rose (R) | 34% | |
| Delegate (State Legislative District 5) | Chris Tomlinson (R) | 34% | |
| Delegate (State Legislative District 5) | Christopher Bouchat (R) | 34% | |
| Delegate (State Legislative District 14) | Anne Kaiser (Democratic) | 0.5% | |
| Delegate (State Legislative District 14) | Bernice Mireku-North (Democratic) | 0.5% | |
| Delegate (State Legislative District 14) | Pam Queen (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
- Lisbon laws: search for the Lisbon, Maryland code of ordinances
- Eldersburg laws: search for the Eldersburg, Maryland code of ordinances
- Howard County website: https://www.howardcountymd.gov/
- Howard County laws: search for the Howard 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 9 | 65% |
| State Senate District 5 | 34% |
| State Senate District 14 | 0.5% |
| State house district | Share of ZIP residents |
|---|---|
| State Legislative Subdistrict 9A | 65% |
| State Legislative District 5 | 34% |
| State Legislative District 14 | 0.5% |
Voting precincts
7 voting precincts overlap ZIP 21797. 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:21797")
ZIP 21797 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.