Boundary Atlas

ZIP code 06357: Niantic, CT

ZIP code 06357 is in Niantic (28% of residents), in Southeastern Connecticut Planning Region, Connecticut. 72% of its residents live outside city limits. It is in Connecticut's 2nd congressional district. Its state senate district is State Senate District 20; its state house district is State House District 37.

11,404residents (2020 Census)
10.6 sq miland area
1cities and towns
1congressional district
2voting precincts

See it on the mapAll of Connecticut

City and county

City or townShare of ZIP residents
Niantic28%

CountyShare of ZIP residents
Southeastern Connecticut Planning Region100%

Town or county subdivisionShare of ZIP residents
East Lyme town100%

Congressional district

Congressional districtShare of ZIP residents
Connecticut's 2nd congressional district (CT-02)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 20100%

State house districtShare of ZIP residents
State House District 37100%

Voting precincts

2 voting precincts overlap ZIP 06357. Map them, with each precinct's share of the ZIP's residents.

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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:06357")

ZIP 06357 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.