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Welcome to Jefferson County ...

Time Zone: Jefferson County lies in the Mountain Time Zone (MST/MDT) and observes daylight saving time.

The community of Rigby is the Seat for Jefferson County.

Jefferson County was founded in 1913 and was created by taking area from Fremont County.

From the Census Estimates for 2019, <1> Jefferson had a population of 29,871 people. This is an increase of 13.91% since the last Census (which gave a population of 26,223 people in 2010).

At the time of the 2010 Census, Jefferson represented 1.67% of the total population of Idaho.

Below are some of the communities located in Jefferson County:

  • Hamer
    (12 miles [19.3 km] to the northwest)
    • Note: The GPS coordinates that we are using for Hamer have been provided by the GNIS.<2> The coordinates still need to be verified.
    • Jump to our Gazetteer entry for Hamer
    • Hamer is located in Jefferson County (ID)
    • Population from the 2020 Census: 103 people
    • Jump to TripAdvisor's Tourism page for Hamer <3>
  • Lewisville
    (6 miles [9.7 km] to the southeast)
  • Menan
    (6 miles [9.7 km] to the southeast)
    • Note: The GPS coordinates that we are using for Menan have been provided by the GNIS.<2> The coordinates still need to be verified.
    • Jump to our Gazetteer entry for Menan
    • Menan is located in Jefferson County (ID)
    • Population from the 2020 Census: 807 people
    • Jump to TripAdvisor's Tourism page for Menan <3>
  • Mud Lake
    (19 miles [30.6 km] to the west)
    • Jump to our Gazetteer entry for Mud Lake
    • Mud Lake is located in Jefferson County (ID)
    • Population from the 2020 Census: 431 people
    • Jump to TripAdvisor's Tourism page for Mud Lake <3>
  • Rigby
    (11 miles [17.7 km] to the southeast)
    • Jump to our Gazetteer entry for Rigby
    • Rigby is located in Jefferson County (ID)
    • Population from the 2020 Census: 4,430 people
    • Jump to TripAdvisor's Tourism page for Rigby <3>
  • Ririe
    (18 miles [29 km] to the southeast)
    • Jump to our Gazetteer entry for Ririe
    • Ririe is located in Jefferson County (ID)
    • Population from the 2020 Census: 694 people
    • Jump to TripAdvisor's Tourism page for Ririe <3>
  • Roberts
    (2 miles [3.2 km] to the south)
    • Jump to our Gazetteer entry for Roberts
    • Roberts is located in Jefferson County (ID)
    • Population from the 2020 Census: 649 people
    • Jump to TripAdvisor's Tourism page for Roberts <3>

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.
<2>The location has been supplied by the Geographic Names Information System - which is maintained by the U.S. Geological Survey (USGS). While these values should be definitive, we found that accuracy can vary and you should double-check the location if accuracy is required.
<3>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.