Boundary County, Idaho

48°47′N 116°27′W / 48.79°N 116.45°W / 48.79; -116.45

Boundary County
Boundary County Courthouse
Official seal of Boundary County
Map of Idaho highlighting Boundary County
Location within the U.S. state of Idaho
Map of the United States highlighting Idaho
Idaho's location within the U.S.
Coordinates: 48°47′N 116°27′W / 48.79°N 116.45°W / 48.79; -116.45
Country United States
State Idaho
FoundedJanuary 23, 1915
Named forCanada–United States border
SeatBonners Ferry
Largest cityBonners Ferry
Area
 • Total1,278 sq mi (3,310 km2)
 • Land1,269 sq mi (3,290 km2)
 • Water9.3 sq mi (24 km2)  0.7%
Population
 (2020)
 • Total12,056
 • Estimate 
(2023)
13,557 Increase
 • Density9.4/sq mi (3.6/km2)
Time zoneUTC−8 (Pacific)
 • Summer (DST)UTC−7 (PDT)
Congressional district1st
Websiteboundarycountyid.org

Boundary County is the northernmost county of the U.S. state of Idaho. As of the 2020 census, the population was 12,056.[1] The county seat and largest city is Bonners Ferry.[2]

Boundary County was created by the Idaho Legislature on January 23, 1915. It is so named because it borders Canada, and is therefore the only county in Idaho with an international border. It is also only one of three counties in the United States that borders two states and a foreign country, the others being Coös County, New Hampshire and Erie County, Pennsylvania; these three counties additionally make up the entirety of the international border of their respective states, the only three counties nationwide to do so.

  1. ^ Cite error: The named reference 2020 Census was invoked but never defined (see the help page).
  2. ^ "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved June 7, 2011.