Boundary Atlas

ZIP code 06355: Mystic, CT

ZIP code 06355 is in Mystic (32% of residents) and Old Mystic (27%), in Southeastern Connecticut Planning Region, Connecticut. 41% of its residents live outside city limits. It is in Connecticut's 2nd congressional district. Its state senate district is State Senate District 18; its state house districts are State House District 41 (66%), State House District 40 (28%) and State House District 43 (5.9%).

12,835residents (2020 Census)
14.2 sq miland area
3cities and towns
1congressional district
5voting precincts

See it on the mapAll of Connecticut

City and county

City or townShare of ZIP residents
Mystic32%
Old Mystic27%
Noank0.5%

CountyShare of ZIP residents
Southeastern Connecticut Planning Region100%

Town or county subdivisionShare of ZIP residents
Groton town67%
Stonington town33%

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 18100%

State house districtShare of ZIP residents
State House District 4166%
State House District 4028%
State House District 435.9%

Voting precincts

5 voting precincts overlap ZIP 06355. 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:06355")

ZIP 06355 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.