Bonneville County, Idaho

Bonneville County profile, demographic data, and geographic information.

Local Government & Public Administration

Authoritative general-purpose local government units serving this area U.S. Census Bureau GUS (2026) / GMAF

Government Unit	Unit Type	Jurisdiction Role	Contact / Address
COUNTY OF BONNEVILLE GUS Population: 133,644 (2024) ID: 162018	County	Official County Government	Contact: COUNTY CLERK 605 N CAPITAL AVE, IDAHO FALLS ID 83402-3582
CITY OF IDAHO FALLS GUS Population: 69,523 (2024) ID: 193176	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 50220, IDAHO FALLS ID 83405-0220
CITY OF AMMON GUS Population: 20,095 (2024) ID: 201589	Municipal	Municipal Government Within County	Contact: CITY TREASURER 2135 S AMMON RD, AMMON ID 83406-6855
CITY OF IONA GUS Population: 3,113 (2024) ID: 211222	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 487, IONA ID 83427-0487
CITY OF UCON GUS Population: 1,218 (2024) ID: 102385	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 98, UCON ID 83454-0098
CITY OF SWAN VALLEY GUS Population: 310 (2024) ID: 162057	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 105, SWAN VALLEY ID 83449-0105
CITY OF IRWIN GUS Population: 289 (2024) ID: 162056	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 148, IRWIN ID 83428-0148