Boundary Atlas

ZIP code 83440: Rexburg, ID

ZIP code 83440 is in Rexburg (78% of residents), in Madison County (98%) and Fremont County (1.5%), Idaho. 22% of its residents live outside city limits. It is in Idaho's 2nd congressional district. Its state senate districts are State Senate District 34 (98%) and State Senate District 31 (1.5%); its state house districts are State House District 34 (98%) and State House District 31 (1.5%).

50,567residents (2020 Census)
181.7 sq miland area
2cities and towns
1congressional district
22voting precincts

See it on the mapAll of Idaho

City and county

City or townShare of ZIP residents
Rexburg78%
Sugar City<0.1%

CountyShare of ZIP residents
Madison County98%
Fremont County1.5%

Town or county subdivisionShare of ZIP residents
Rexburg CCD89%
Sugar City CCD9.7%
St. Anthony CCD1.5%
East Madison CCD<0.1%

Congressional district

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

Elected officials

OfficeMemberContactShare of residents
U.S. Representative (ID-02)Michael K. Simpson (R)202-225-5531100%
U.S. SenatorJames E. Risch (R)202-224-2752 · contact formstatewide
U.S. SenatorMike Crapo (R)202-224-6142 · contact formstatewide
State Senator (State Senate District 34)Doug Ricks (R)208-557-966598%
State Senator (State Senate District 31)Van Burtenshaw (R)1.5%
State Representative (State House District 34)Britt Raybould (R)98%
State Representative (State House District 34)Jon Weber (R)208-390-612898%
State Representative (State House District 31)Jerald Raymond (R)208-317-87771.5%
State Representative (State House District 31)Rod Furniss (R)208-589-11001.5%

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

State legislative districts

State senate districtShare of ZIP residents
State Senate District 3498%
State Senate District 311.5%

State house districtShare of ZIP residents
State House District 3498%
State House District 311.5%

Voting precincts

22 voting precincts overlap ZIP 83440. 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:83440")

ZIP 83440 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.