ZIP code 06840 is in New Canaan (30% of residents), in Western Connecticut Planning Region, Connecticut. 70% of its residents live outside city limits. It is in Connecticut's 4th congressional district. Its state senate districts are State Senate District 36 (84%) and State Senate District 26 (16%); its state house districts are State House District 125 (74%), State House District 42 (16%) and State House District 142 (9.9%).
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).
3 voting precincts overlap ZIP 06840.
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:06840")
ZIP 06840 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.