Maryland's 3rd congressional district (MD-03)
Maryland's 3rd congressional district (MD-03) covers parts or all of Howard County, Anne Arundel County and Carroll County, and 47 ZIP codes (30 wholly inside it). Its 2020 population was 771,733. This is the map in force for the November 3, 2026 election.
Who represents MD-03
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (MD-03) | Sarah Elfreth (D) | 202-225-4016 |
| U.S. Senator | Angela D. Alsobrooks (D) | 202-224-4524 · contact form |
| U.S. Senator | Chris Van Hollen (D) | 202-224-4654 · contact form |
Officials serving now (members of Congress until January 3, 2027). Sources: Members of Congress: the @unitedstates project, congress-legislators (CC0).
Counties
| County | Share of the county's residents in MD-03 |
|---|---|
| Howard County | 100% |
| Anne Arundel County | 71% |
| Carroll County | 12% |
ZIP codes
Percentages mark ZIPs only partly in MD-03: the share of that ZIP's residents inside it.
- 20701 (46%)
- 20723
- 20759
- 20763
- 20777 (99%)
- 20794 (70%)
- 20833 (1.7%)
- 21012
- 21029
- 21032 (100%)
- 21036
- 21037 (6.7%)
- 21042
- 21043 (98%)
- 21044
- 21045
- 21046
- 21054 (3.5%)
- 21056
- 21060
- 21061
- 21075
- 21076
- 21077
- 21090
- 21104 (54%)
- 21108
- 21113 (0.1%)
- 21122
- 21144 (96%)
- 21146
- 21163 (66%)
- 21225 (47%)
- 21226 (60%)
- 21240
- 21401
- 21402
- 21403
- 21405
- 21409
- 21723
- 21737
- 21738
- 21771 (45%)
- 21784 (21%)
- 21794
- 21797 (99%)
Towns
District 1, Elkridge, District 13, Mount Airy, District 2, District 2, Ellicott City, District 3, District 3, West Friendship, District 4, Lisbon, District 5, Clarksville, District 6, Savage, District 6, District 5, District 1, District 14, Berrett and District 4.
Get this in your AI agent
Your agent can draw every precinct in MD-03, or list them with population shares (related_geographies). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
get_boundaries(id="us:congressional_district:2403", children_level="precinct", include_districts=True)