2 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bonners Ferry | 1 | 2,805 | 2,534 | 1.96% | 1,225 | 2.29 | City |
| Moyie Springs | 2 | 1,245 | 832 | 7.14% | 803 | 1.55 | City |
Bonners Ferry is the largest city in Boundary County, with a population of 2,805.
Moyie Springs is the smallest city in Boundary County.
There are 2 cities in Boundary County, Idaho.