2 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Rexburg | 1 | 40,344 | 39,421 | 0.46% | 3,990 | 10.11 | City |
| Sugar City | 2 | 2,372 | 1,729 | 5.75% | 1,196 | 1.98 | City |
Rexburg is the largest city in Madison County, with a population of 40,344.
Sugar City is the smallest city in Madison County.
There are 2 cities in Madison County, Idaho.