Jefferson County, Idaho Cities (2024)

Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)

City
Rank
2024 Pop.
2020 Pop.
Change
Density (/mi²)
Area (mi²)
Type
Rigby15,7455,0723.01%2,3762.4City
Menan27407150.82%7171.0City
Ririe37186651.84%1,3810.5City
Roberts46045004.5%1,9240.3City
Lewisville54504161.81%6780.7City
Mud Lake63633183.13%2,5560.1City

Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.

What is the largest city in Jefferson County, Idaho?

Rigby is the largest city in Jefferson County.

What is the smallest city in Jefferson County, Idaho?

Mud Lake is the smallest city in Jefferson County.

How many cities are in Jefferson County?

There are 6 cities in Jefferson County, Idaho.

Frequently Asked Questions