About Jefferson County
Welcome to the Official Web Page of Jefferson County Idaho. Jefferson County was established in 1914 with its county seat at Rigby. It was named after Thomas Jefferson, third president of the United States. The first settlers constructed irrigation systems in the county.
Courthouse
210 Courthouse Way
Rigby, ID 83442
Mon. through Fri., 8 am to 5 pm
Mosquito Hotline: 359-5450
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