Madison County

Madison County is a county in eastern Idaho covering approximately 473 square miles (1,225 square kilometers). Rexburg serves as the county seat and its largest community.

The county was established in February 1913 when it separated from Fremont County and was named after U.S. President James Madison. Following its creation, the area developed its own administrative structure and institutions to serve its growing population.

Brigham Young University-Idaho stands as a major educational institution in Madison County, shaping the regional educational landscape through its programs and facilities.

The area experiences a continental climate with cold winters and moderate summers, making late spring and early fall the best times to visit. Most services and attractions center around Rexburg, making it a convenient base for exploring the wider area.

A major dam failure on the Teton River in June 1976 caused severe flooding throughout the area and resulted in a federal disaster declaration. This event significantly influenced how the region approaches infrastructure planning and emergency preparedness.

Location: Idaho

Inception: February 18, 1913

Capital city: Rexburg

Shares border with: Fremont County, Bonneville County, Teton County, Jefferson County

Website: https://co.madison.id.us

GPS coordinates: 43.79000,-111.66000

Latest update: December 14, 2025 20:26