Jefferson County, Idaho Cities (2025)

6 cities

City
Rank
2025 Pop. ↓
2020 Pop.
Annual Change
Density
Area (mi²)
Type
Rigby15,8355,0732.67%2,4132 City
Menan27387150.54%7151 City
Ririe37276661.68%1,3981 City
Roberts46035003.43%1,9200 City
Lewisville54534161.57%6821 City
Mud Lake63693182.79%2,5990 City

Jefferson County Cities Summary

Largest City

Rigby is the largest city in Jefferson County, with a population of 5,835.

Smallest City

Mud Lake is the smallest city in Jefferson County, with a population of 369.

10 Largest Cities

There are 6 cities in Jefferson County, Idaho.

Location of Jefferson County