Jefferson County | |
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![]() Entering Jefferson County in Grant, Idaho. | |
![]() Location within the U.S. state of Idaho | |
![]() Idaho's location within the U.S. | |
Coordinates: 43°49′N 112°19′W / 43.82°N 112.31°W | |
Country | ![]() |
State | ![]() |
Founded | February 18, 1913 |
Named for | Thomas Jefferson |
Seat | Rigby |
Largest city | Rigby |
Area | |
• Total | 1,106 sq mi (2,860 km2) |
• Land | 1,094 sq mi (2,830 km2) |
• Water | 12 sq mi (30 km2) 1.1% |
Population (2020) | |
• Total | 30,891 ![]() |
• Density | 28.24/sq mi (10.90/km2) |
Time zone | UTC−7 (Mountain) |
• Summer (DST) | UTC−6 (MDT) |
Congressional district | 2nd |
Website | www |
Jefferson County is a county located in the U.S. state of Idaho. As of the 2020 Census, the county's population was 30,891.[1] The county seat and largest city is Rigby.[2] The county was established in 1913 and named after Thomas Jefferson, the third U.S. President.[3] Jefferson County is part of the Idaho Falls, ID Metropolitan Statistical Area.