Jefferson County, Idaho

Jefferson 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 JEFFERSON GUS Population: 34,854 (2024) ID: 162024	County	Official County Government	Contact: CHIEF DEPUTY CLERK 210 COURTHOUSE WAY, STE 100, RIGBY ID 83442-5294
CITY OF RIGBY GUS Population: 5,683 (2024) ID: 162082	Municipal	Municipal Government Within County	Contact: CLERK TREAS 158 W FREMONT AVE, RIGBY ID 83442-1399
CITY OF MENAN GUS Population: 734 (2024) ID: 102395	Municipal	Municipal Government Within County	Contact: CITY CLERK/TREASURER PO BOX 127, MENAN ID 83434-0127
CITY OF RIRIE GUS Population: 715 (2024) ID: 162083	Municipal	Municipal Government Within County	Contact: CITY CLERK PO BOX 68, RIRIE ID 83443-0068
CITY OF ROBERTS GUS Population: 583 (2024) ID: 162084	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 242, ROBERTS ID 83444-0242
CITY OF LEWISVILLE GUS Population: 446 (2024) ID: 207759	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 160, LEWISVILLE ID 83431-0160
CITY OF MUD LAKE GUS Population: 359 (2024) ID: 124664	Municipal	Municipal Government Within County	Contact: MAYOR PO BOX 56, TERRETON ID 83450-0056