ZIP code 77640 is in Port Arthur, in Jefferson County, Texas. It is in Texas's 14th congressional district. Its state senate districts are State Senate District 4 (89%) and State Senate District 3 (11%); its state house districts are State House District 22 (67%) and State House District 21 (33%).
Elected in 2024 under TX's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).
Members serving now (119th Congress, until January 3, 2027). Source: Members of Congress: the @unitedstates project, congress-legislators (CC0).
State legislative districts
State senate district
Share of ZIP residents
State Senate District 4
89%
State Senate District 3
11%
State house district
Share of ZIP residents
State House District 22
67%
State House District 21
33%
Voting precincts
18 voting precincts overlap ZIP 77640.
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:77640")
ZIP 77640 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.