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Boundary County, Idaho facts for kids

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Boundary County
Boundary County Courthouse.jpg
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.
Country  United States
State  Idaho
Founded January 23, 1915
Named for Canada/U.S. Border
Seat Bonners Ferry
Largest city Bonners Ferry
 • Total 1,278 sq mi (3,310 km2)
 • Land 1,269 sq mi (3,290 km2)
 • Water 9.3 sq mi (24 km2)  0.7%
 • Total 12,056
 • Density 9.433/sq mi (3.6423/km2)
Time zone UTC−8 (Pacific)
 • Summer (DST) UTC−7 (PDT)
Congressional district 1st

Boundary County is a county located in 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.

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.


Boundary County was formed on January 23, 1915 from Bonner County. It was named Boundary County because it lies on the border of Canada, Washington and Montana.

Bonner County is presently divided into 7 election precincts: Bonners Ferry, Copeland, Kootenai, Moyie, Naples, North Bonners Ferry, and Valley View. All contain a portion of Bonners Ferry City except Copeland, Moyie, and Naples precincts. Moyie Springs was incorporated in 1947.

Settlement of the area started with the establishment of Bonners Ferry on the Kootenai River in 1864. Settlement was limited to the ferry operation until about 1890. The town of Bonners Ferry was established in 1893. At that point settlement was still sparse with small ranching and mining operations, but an expanding timber economy. By 1900, other areas started to develop with the Boulder (now Kootenai), Boundary (now Copeland), and Naples precincts first listed in the U.S. Census of that year. The Moyie precinct first appeared in the 1910 census.

In 1980, convicted spy Christopher John Boyce found refuge in Boundary County, for a few months, after his escape from the Lompoc Federal Correctional Complex. He stayed at the home of Gloria Ann White. Boyce sustained himself during his stay with a series of bank robberies in the surrounding area, allegedly with technical assistance from Ms. White.

In 1992, Boundary County was the scene of the infamous Ruby Ridge siege by 350–400 armed federal agents against Randy Weaver and his family.

Presidential election results
Year Democrat Republican
2016 18.07% 933 73.39% 3,789
2012 29.96% 1,225 69.06% 3,138
2008 31.35% 1,484 65.02% 3,078
2004 28.96% 1,268 68.78% 3,012
2000 21.42% 832 72.01% 2,797


According to the U.S. Census Bureau, the county has a total area of 1,278 square miles (3,310 km2), of which 1,269 square miles (3,290 km2) is land and 9.3 square miles (24 km2) (0.7%) is water.

Boundary County is one of only two counties in the United States to share land borders with 2 different states and another country, along with Coös County, New Hampshire.

Adjacent counties

National protected areas



  • US 2.svg US 2
  • US 95.svg US 95
  • ID-1.svg SH-1


Boundary County Airport is a county-owned, public-use airport located two nautical miles (3.7 km) northeast of the central business district of Bonners Ferry.


Historical population
Census Pop.
1920 4,474
1930 4,555 1.8%
1940 5,987 31.4%
1950 5,908 −1.3%
1960 5,809 −1.7%
1970 6,371 9.7%
1980 7,289 14.4%
1990 8,332 14.3%
2000 9,871 18.5%
2010 10,972 11.2%
2020 12,056 9.9%
U.S. Decennial Census
1790–1960 1900–1990
1990–2000 2010–2020 2020

2010 census

As of the 2010 United States Census, there were 10,972 people, 4,421 households, and 2,976 families living in the county. The population density was 8.6 inhabitants per square mile (3.3/km2). There were 5,175 housing units at an average density of 4.1 per square mile (1.6/km2). The racial makeup of the county was 94.8% white, 1.7% American Indian, 0.6% Asian, 0.3% black or African American, 0.1% Pacific islander, 0.5% from other races, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 3.7% of the population. In terms of ancestry, 22.5% were German, 12.8% were English, 11.2% were Irish, 7.4% were American, 5.9% were Norwegian, 5.4% were Dutch, and 5.1% were Scottish.

Of the 4,421 households, 29.7% had children under the age of 18 living with them, 55.0% were married couples living together, 7.6% had a female householder with no husband present, 32.7% were non-families, and 27.5% of all households were made up of individuals. The average household size was 2.47 and the average family size was 3.00. The median age was 42.8 years.

The median income for a household in the county was $37,712 and the median income for a family was $43,562. Males had a median income of $36,125 versus $26,076 for females. The per capita income for the county was $18,011. About 15.7% of families and 18.8% of the population were below the poverty line, including 22.0% of those under age 18 and 13.4% of those age 65 or over.



Unincorporated communities

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