• county
  • FIPS 30003
  • Largest town: Hardin

Big Horn County, Montana

Big Horn County had 12,796 residents in the Census Vintage 2024 estimate, on 4,997.8 square miles of land. It ranks 16th of 56 in Montana by population and 5th by land area.

Population
12,796
#16 of 56 in Montana · #2,233 in US
Area
4,997.8 sq mi
#5 of 56 in Montana · #79 in US
Density
2.6 / sq mi
#32 of 56 in Montana · #2,941 in US
Median household income
$51,259
#52 of 56 in Montana · #2,627 in US

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

Big Horn County within Montana. Pin: Helena.

Measure from here

Tools and pages that start from Big Horn County

Big Horn County population, land area and income

Big Horn County had 12,796 residents in the Census Vintage 2024 estimate, on 4,997.8 square miles of land. It ranks 16th of 56 in Montana by population and 5th by land area. That works out to 2.6 people per square mile, below the US average of 96.3, and in the bottom quarter nationally.

The median county-equivalent in Montana has 7,814 residents; Big Horn County is somewhat larger.

Its SAIPE 2023 median household income of $51,259 is in the bottom quarter among 3,143 counties with an estimate.

National rank among 3,144

Population

12,796

3144th1st

2233rd of 3,144 (US)

Land area

4,998 sq mi

3144th1st

79th of 3,144 (US)

Density

2.6 / sq mi

3144th1st

2941st of 3,144 (US)

Median household income

$51,259

3143rd1st

2627th of 3,143 (US)

Rank within Montana (56)

Population

12,796

56th1st

16th of 56 (MT)

Land area

4,998 sq mi

56th1st

5th of 56 (MT)

Density

2.6 / sq mi

56th1st

32nd of 56 (MT)

Median household income

$51,259

56th1st

52nd of 56 (MT)

How Big Horn County's population changed since 2020

Big Horn County lost 287 residents between the July 2020 and July 2024 estimates, a drop of 2.2%. That ranks 50th of 56 in Montana for growth. The median Montana county changed by +2.8%, and the state as a whole by +4.6%.

Since the April 2020 estimates base, Big Horn County recorded 785 births and 739 deaths, a natural change of +46. Net international migration added -7 and net domestic migration, people moving to or from other US counties, came to -358. The largest single component was domestic migration, which removed 358 people.

13.1k202012.9k202112.9k202212.8k202312.8k2024
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
785
Deaths
739
Net international migration
-7
Net domestic migration
-358
Change, July 2023 to July 2024
-29

Where Big Horn County is

The Census internal point of Big Horn County is at 45.407900, -107.518200. It sits in UTM zone 13N. The map shades Montana's 56 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Big Horn County outlined. Dots are towns of 1,000+ people with residents in it.

Liberty County: -1.2%Golden Valley County: +5.1%Dawson County: -2.1%Flathead County: +9.2%Beaverhead County: +6.7%Prairie County: +2.0%Garfield County: +0.9%Lewis and Clark County: +5.5%Sweet Grass County: +2.4%Wheatland County: -0.7%Ravalli County: +8.5%Jefferson County: +9.6%Carter County: -0.6%Chouteau County: -0.6%Custer County: +0.9%Teton County: +3.1%Granite County: +9.0%Deer Lodge County: +4.1%Cascade County: +0.1%Powder River County: +2.4%Meagher County: +7.3%Daniels County: -1.7%Glacier County: -1.8%Wibaux County: -2.7%Fallon County: -2.7%McCone County: -0.7%Sheridan County: -2.5%Missoula County: +3.5%Toole County: +3.7%Sanders County: +11.5%Roosevelt County: -5.6%Rosebud County: -1.3%Treasure County: -2.5%Yellowstone County: +3.9%Blaine County: -1.4%Musselshell County: +14.8%Broadwater County: +21.0%Powell County: +2.6%Fergus County: +3.4%Phillips County: +0.1%Gallatin County: +6.2%Silver Bow County: +2.6%Madison County: +12.6%Richland County: -4.4%Lake County: +6.9%Valley County: -1.7%Judith Basin County: +4.3%Hill County: -1.2%Big Horn County: -2.2%Stillwater County: +5.0%Carbon County: +9.4%Mineral County: +13.7%Petroleum County: +4.6%Pondera County: +3.4%Park County: +4.9%Lincoln County: +12.4%
Change 2020 to 2024
  1. < -1.4%
  2. < +0.9%
  3. < +3.9%
  4. < +7.3%
  5. ≥ +7.3%
no data

Orange pin: Big Horn County internal point. Dark pin: Helena.

Internal point

Decimal
45.407900, -107.518200
DMS
45°24'28.44"N 107°31'5.52"W
UTM
13N 302941.4E 5031349.3N
Geohash
c85d3678h
Plus code
85QJCF5J+5P

Towns in Big Horn County

One incorporated place of 1,000+ people has residents in Big Horn County, 3,719 people together, or 29% of the county. Each figure counts only the part of the town inside Big Horn County; towns marked "part" extend into another county. The largest is Hardin with 3,719.

  1. 01Hardin3,719
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Big Horn County

The Census 2024 county adjacency file lists 7 neighbors for Big Horn County, including 2 across a state line. The most populous is Yellowstone County, MT, with 171,583 residents. Distances run between Census internal points in a straight line.

Distance to Helena and the nearest big city

Helena is 230.7 miles WNW of Big Horn County's internal point in a straight line. The nearest place of 100,000 or more is Billings, MT (population 121,483), 56.5 miles away. The nearest place of 10,000 or more is Sheridan, WY (population 19,813), 50.1 miles away.

Big Horn County FIPS code

The FIPS code of Big Horn County is 30003: state code 30 for Montana plus county code 003. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $51,259.

Questions people ask

What is the population of Big Horn County, Montana?

The Census Vintage 2024 estimate for July 1, 2024 is 12,796. That is down 287 people (2.2%) from the July 2020 estimate of 13,083.

What is the FIPS code of Big Horn County?

30003. The first two digits (30) are Montana; the last three (003) identify the county.

What is the largest town in Big Horn County?

Hardin, with 3,719 residents inside Big Horn County in 2024.

Which counties border Big Horn County?

7 county-equivalents border it in the Census 2024 adjacency file: Yellowstone County, MT; Sheridan County, WY; Big Horn County, WY; Carbon County, MT; Rosebud County, MT; Powder River County, MT; Treasure County, MT.

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.