- Boundary County, Idaho (data.census.gov)
Boundary County, Idaho has 1,268.7 square miles of land area and is the 23rd largest county in Idaho by total area. Boundary County, Idaho is bordered by Pend Oreille County, Washington, Bonner County, Idaho, and Lincoln County, Montana.
- Boundary County, Idaho (Wikipedia)
Boundary County is the northernmost county of the U.S. state of Idaho. As of the 2020 census, the population was 12,056. The county seat and largest city is Bonners Ferry.