2 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bonners Ferry | 1 | 2,851 | 2,536 | 2.26% | 1,245 | 2 | City |
| Moyie Springs | 2 | 1,323 | 832 | 8% | 854 | 2 | City |
Bonners Ferry is the largest city in Boundary County, with a population of 2,851.
Moyie Springs is the smallest city in Boundary County, with a population of 1,323.
There are 2 cities in Boundary County, Idaho.