ZIP code 10543: Mamaroneck, NY

ZIP code 10543 is in Mamaroneck (94% of residents), in Westchester County, New York. 6.4% of its residents live outside city limits. It is in New York's 16th congressional district. Its state senate district is State Senate District 37; its state house districts are Assembly District 91 (100%) and Assembly District 88 (0.2%).

21,296residents (2020 Census)

4.3 sq miland area

2cities and towns

1congressional district

20voting precincts

See it on the map All of New York

City and county

City or town	Share of ZIP residents
Mamaroneck	94%
Scarsdale	0.2%

County	Share of ZIP residents
Westchester County	100%

Town or county subdivision	Share of ZIP residents
Mamaroneck town	63%
Rye town	37%
Scarsdale town	0.2%

Congressional district

Congressional district	Share of ZIP residents
New York's 16th congressional district (NY-16)	100%

Elected officials

Office	Member	Contact	Share of residents
U.S. Representative (NY-16)	George Latimer (D)	202-225-2464	100%
U.S. Senator	Charles E. Schumer (D)	202-224-6542 · contact form	statewide
U.S. Senator	Kirsten E. Gillibrand (D)	202-224-4451 · contact form	statewide
State Senator (State Senate District 37)	Shelley Mayer (Democratic/Working Families)	914-934-5250	100%
Assembly Member (Assembly District 91)	Steve Otis (Democratic)	914-939-7028	100%
Assembly Member (Assembly District 88)	Amy Paulin (Democratic)	914-723-1115	0.2%

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

Mamaroneck website: https://townofmamaroneckny.gov
Mamaroneck laws: search for the Mamaroneck, New York code of ordinances
Westchester County laws: search for the Westchester County, New York code of ordinances

State legislative districts

State senate district	Share of ZIP residents
State Senate District 37	100%

State house district	Share of ZIP residents
Assembly District 91	100%
Assembly District 88	0.2%

Voting precincts

20 voting precincts overlap ZIP 10543. 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:10543")

ZIP 10543 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.