ZIP code 20871: Clarksburg, MD
ZIP code 20871 is in Clarksburg (92% of residents) and Green Valley (2.1%), in Montgomery County (98%) and Frederick County (2.1%), Maryland. 5.4% of its residents live outside city limits. It is in Maryland's 6th congressional district. Its state senate districts are State Senate District 15 (45%), State Senate District 39 (25%), State Senate District 9 (21%), State Senate District 14 (7.8%) and State Senate District 4 (2.1%); its state house districts are State Legislative District 15 (45%), State Legislative District 39 (25%), State Legislative Subdistrict 9A (21%), State Legislative District 14 (7.8%) and State Legislative District 4 (2.1%).
See it on the mapAll of Maryland
City and county
| City or town | Share of ZIP residents |
|---|---|
| Clarksburg | 92% |
| Green Valley | 2.1% |
| Ten Mile Creek | 0.4% |
| County | Share of ZIP residents |
|---|---|
| Montgomery County | 98% |
| Frederick County | 2.1% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| District 2 | 97% |
| District 7, Urbana | 2.1% |
| District 11 | 0.7% |
| District 12 | 0.4% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| Maryland's 6th congressional district (MD-06) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (MD-06) | April McClain Delaney (D) | 202-225-2721 | 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 |
Plus 19 state legislators across 10 districts. Look up an address for the exact ones.
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
- Clarksburg laws: search for the Clarksburg, Maryland code of ordinances
- Green Valley laws: search for the Green Valley, Maryland code of ordinances
- Montgomery County website: https://www.montgomerycountymd.gov/
- Montgomery County laws: search for the Montgomery County, Maryland code of ordinances
- Frederick County website: http://FrederickCountyMD.gov/
- Frederick County laws: search for the Frederick County, Maryland code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 15 | 45% |
| State Senate District 39 | 25% |
| State Senate District 9 | 21% |
| State Senate District 14 | 7.8% |
| State Senate District 4 | 2.1% |
| State house district | Share of ZIP residents |
|---|---|
| State Legislative District 15 | 45% |
| State Legislative District 39 | 25% |
| State Legislative Subdistrict 9A | 21% |
| State Legislative District 14 | 7.8% |
| State Legislative District 4 | 2.1% |
Voting precincts
9 voting precincts overlap ZIP 20871. 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:20871")
ZIP 20871 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.