Madison County is located in Idaho's Upper Snake River Valley. Named for James Madison, the fourth president of the United States, it was established February 18, 1913 with the county seat at Rexburg. As of 2016 the population was 39,048. This website provides a cost-effective way for our county to provide information and communicate with our community.
134 E MAIN - REXBURG, ID - 83440 - (208) 359-6200