Jefferson County, Idaho

Jefferson County
Jefferson County
County
	Entering Jefferson County in Grant, Idaho.
	Seal
	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	United States
State	Idaho
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.co.jefferson.id.us

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.

^ 2020 Census, US Census Bureau, Jefferson County, Idaho Profile
^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.
^ "Jefferson County". State of Idaho. Archived from the original on August 15, 2009. Retrieved May 31, 2009.