ZIP code 20851: Rockville, MD

ZIP code 20851 is in Rockville (83% of residents) and North Bethesda (16%), in Montgomery County, Maryland. It is in Maryland's 8th congressional district. Its state senate districts are State Senate District 17 (83%) and State Senate District 18 (17%); its state house districts are State Legislative District 17 (83%) and State Legislative District 18 (17%).

14,327residents (2020 Census)

2.5 sq miland area

3cities and towns

1congressional district

6voting precincts

See it on the map All of Maryland

City and county

City or town	Share of ZIP residents
Rockville	83%
North Bethesda	16%
Aspen Hill	0.6%

County	Share of ZIP residents
Montgomery County	100%

Town or county subdivision	Share of ZIP residents
District 4	100%

Congressional district

Congressional district	Share of ZIP residents
Maryland's 8th congressional district (MD-08)	100%

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (MD-08)	Jamie Raskin (D)	202-225-5341	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 17)	Cheryl Kagan (Democratic)		83%
State Senator (State Senate District 18)	Jeff Waldstreicher (Democratic)		17%
State Senator (State Senate District 19)	Ben Kramer (Democratic)		<0.1%
Delegate (State Legislative District 17)	Joe Vogel (Democratic)		83%
Delegate (State Legislative District 17)	Julie Palakovich Carr (Democratic)		83%
Delegate (State Legislative District 17)	Ryan Spiegel (Democratic)		83%
Delegate (State Legislative District 18)	Aaron Kaufman (Democratic)		17%
Delegate (State Legislative District 18)	Emily Shetty (Democratic)		17%
Delegate (State Legislative District 18)	Jared Solomon (Democratic)		17%
Delegate (State Legislative District 19)	Bonnie Cullison (Democratic)		<0.1%
Delegate (State Legislative District 19)	Charlotte Crutchfield (Democratic)		<0.1%
Delegate (State Legislative District 19)	Vaughn Stewart (Democratic)		<0.1%

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

Rockville website: https://www.rockvillemd.gov/
Rockville laws: search for the Rockville, Maryland code of ordinances
North Bethesda laws: search for the North Bethesda, Maryland code of ordinances
Montgomery County website: https://www.montgomerycountymd.gov/
Montgomery County laws: search for the Montgomery County, Maryland code of ordinances

State legislative districts

State senate district	Share of ZIP residents
State Senate District 17	83%
State Senate District 18	17%
State Senate District 19	land only

State house district	Share of ZIP residents
State Legislative District 17	83%
State Legislative District 18	17%
State Legislative District 19	land only

Voting precincts

6 voting precincts overlap ZIP 20851. 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:20851")

ZIP 20851 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.