| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bonners Ferry | 1 | 2,849 | 2,534 | 1.86% | 1,244 | 2 | City |
| Moyie Springs | 2 | 1,411 | 841 | 7.14% | 910 | 2 | City |
Bonners Ferry is the largest city in Boundary County, with a population of 2,849.
Moyie Springs is the smallest city in Boundary County, with a population of 1,411.
There are 2 cities in Boundary County, Idaho.