• county
  • FIPS 16021
  • Largest town: Bonners Ferry

Boundary County, Idaho

Boundary County had 14,040 residents in the Census Vintage 2024 estimate, on 1,268.7 square miles of land. It ranks 25th of 44 in Idaho by population and 23rd by land area.

Population
14,040
#25 of 44 in Idaho · #2,161 in US
Area
1,268.7 sq mi
#23 of 44 in Idaho · #476 in US
Density
11 / sq mi
#21 of 44 in Idaho · #2,529 in US
Median household income
$65,044
#27 of 44 in Idaho · #1,365 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Boundary County within Idaho. Pin: Boise.

Measure from here

Tools and pages that start from Boundary County

Boundary County population, land area and income

Boundary County had 14,040 residents in the Census Vintage 2024 estimate, on 1,268.7 square miles of land. It ranks 25th of 44 in Idaho by population and 23rd by land area. That works out to 11.1 people per square mile, below the US average of 96.3, and in the bottom quarter nationally.

The median county-equivalent in Idaho has 15,019 residents, about the same as Boundary County.

Its SAIPE 2023 median household income of $65,044 is above the national county median among 3,143 counties with an estimate.

National rank among 3,144

Population

14,040

3144th1st

2161st of 3,144 (US)

Land area

1,269 sq mi

3144th1st

476th of 3,144 (US)

Density

11.1 / sq mi

3144th1st

2529th of 3,144 (US)

Median household income

$65,044

3143rd1st

1365th of 3,143 (US)

Rank within Idaho (44)

Population

14,040

44th1st

25th of 44 (ID)

Land area

1,269 sq mi

44th1st

23rd of 44 (ID)

Density

11.1 / sq mi

44th1st

21st of 44 (ID)

Median household income

$65,044

44th1st

27th of 44 (ID)

How Boundary County's population changed since 2020

Boundary County gained 1,899 residents between the July 2020 and July 2024 estimates, a rise of 15.6%. That ranks 1st of 44 in Idaho for growth. The median Idaho county changed by +7.2%, and the state as a whole by +8.2%.

Since the April 2020 estimates base, Boundary County recorded 658 births and 635 deaths, a natural change of +23. Net international migration added +278 and net domestic migration, people moving to or from other US counties, came to +1,684. The largest single component was domestic migration, which added 1,684 people.

12.1k202012.6k202113.4k202213.7k202314.0k2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
658
Deaths
635
Net international migration
+278
Net domestic migration
+1,684
Change, July 2023 to July 2024
+363

Where Boundary County is

The Census internal point of Boundary County is at 48.773100, -116.524700. It sits in UTM zone 11N. The map shades Idaho's 44 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Boundary County outlined. Dots are towns of 1,000+ people with residents in it.

Madison County: +5.0%Idaho County: +8.0%Benewah County: +9.9%Gooding County: +3.4%Lincoln County: +8.2%Minidoka County: +4.7%Custer County: +7.7%Boundary County: +15.6%Lemhi County: +5.5%Twin Falls County: +6.8%Franklin County: +9.5%Oneida County: +9.0%Gem County: +13.4%Shoshone County: +6.6%Fremont County: +7.3%Clearwater County: +4.6%Kootenai County: +9.0%Cassia County: +4.9%Blaine County: +3.8%Clark County: +0.1%Jerome County: +7.4%Bonner County: +13.8%Elmore County: +3.7%Caribou County: +3.2%Bonneville County: +7.1%Jefferson County: +12.1%Power County: +6.3%Lewis County: +5.8%Nez Perce County: +1.7%Ada County: +7.5%Adams County: +12.9%Valley County: +7.9%Bingham County: +5.8%Bannock County: +4.3%Owyhee County: +6.2%Washington County: +9.3%Latah County: +6.4%Teton County: +10.2%Camas County: +15.0%Boise County: +12.0%Bear Lake County: +6.5%Butte County: +5.9%Canyon County: +14.5%Payette County: +8.1%
Change 2020 to 2024
  1. < +4.7%
  2. < +6.4%
  3. < +7.7%
  4. < +9.9%
  5. ≥ +9.9%
no data

Orange pin: Boundary County internal point. Dark pin: Boise.

Internal point

Decimal
48.773100, -116.524700
DMS
48°46'23.16"N 116°31'28.92"W
UTM
11N 534922.2E 5402341.8N
Geohash
c2tjkqv7c
Plus code
85W5QFFG+64

Towns in Boundary County

2 incorporated places of 1,000+ people have residents in Boundary County, 4,013 people together, or 29% of the county. Each figure counts only the part of the town inside Boundary County; towns marked "part" extend into another county. The largest is Bonners Ferry with 2,788.

  1. 01Bonners Ferry2,788
  2. 02Moyie Springs1,225
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Boundary County

The Census 2024 county adjacency file lists 3 neighbors for Boundary County, including 2 across a state line. The most populous is Bonner County, ID, with 53,955 residents. Distances run between Census internal points in a straight line.

Distance to Boise and the nearest big city

Boise is 356.5 miles S of Boundary County's internal point in a straight line. The nearest place of 100,000 or more is Spokane Valley, WA (population 108,267), 83.3 miles away. The nearest place of 10,000 or more is Sandpoint, ID (population 10,444), 34.0 miles away.

Boundary County FIPS code

The FIPS code of Boundary County is 16021: state code 16 for Idaho plus county code 021. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $65,044.

Questions people ask

What is the population of Boundary County, Idaho?

The Census Vintage 2024 estimate for July 1, 2024 is 14,040. That is up 1,899 people (15.6%) from the July 2020 estimate of 12,141.

What is the FIPS code of Boundary County?

16021. The first two digits (16) are Idaho; the last three (021) identify the county.

What is the largest town in Boundary County?

Bonners Ferry, with 2,788 residents inside Boundary County in 2024.

Which counties border Boundary County?

3 county-equivalents border it in the Census 2024 adjacency file: Bonner County, ID; Lincoln County, MT; Pend Oreille County, WA.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.