| County: | Fallon County |
| State: | Montana |
| Founded Date: | December 9 |
| Founded Year: | 1913 |
| Seat Wl: | Baker |
| Largest City Wl: | Baker |
| Area Total Sq Mi: | 1623 |
| Area Land Sq Mi: | 1621 |
| Area Water Sq Mi: | 2.3 |
| Area Percentage: | 0.1 |
| Population As Of: | 2020 |
| Population Total: | 3049 |
| Pop Est As Of: | 2022 |
| Population Est: | 3011 |
| Population Density Sq Mi: | auto |
| Time Zone: | Mountain |
| Web: | www.falloncounty.net |
| Ex Image: | Baker MT Fallon County Courthouse.jpg |
| Ex Image Cap: | Fallon County Courthouse in Baker |
| District: | 2nd |
| Footnotes: |
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Fallon County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 3,049.[1] Its county seat is Baker.[2] The county was created in 1913 from a portion of Custer County. It is named for Benjamin O'Fallon, a nephew of Captain William Clark and an Indian agent for the upper Missouri region from 1823 to 1827.[3]
According to the United States Census Bureau, the county has a total area of, of which is land and (0.1%) is water.[4]
As of the 2020 census, there were 3,049 people living in the county.
As of the 2010 census, there were 2,890 people, 1,233 households, and 810 families living in the county. The population density was . There were 1,470 housing units at an average density of 0.9/mi2. The racial makeup of the county was 97.4% white, 0.6% Asian, 0.4% American Indian, 0.1% Pacific islander, 0.1% black or African American, 0.2% from other races, and 1.3% from two or more races. Those of Hispanic or Latino origin made up 1.2% of the population. In terms of ancestry, 53.0% were German, 24.8% were Irish, 12.1% were Norwegian, 10.6% were English, 5.3% were Scotch-Irish, and 0.4% were American.
Of the 1,233 households, 28.4% had children under the age of 18 living with them, 56.0% were married couples living together, 5.7% had a female householder with no husband present, 34.3% were non-families, and 30.1% of all households were made up of individuals. The average household size was 2.32 and the average family size was 2.88. The median age was 42.9 years.
The median income for a household in the county was $52,529 and the median income for a family was $64,500. Males had a median income of $41,570 versus $30,000 for females. The per capita income for the county was $26,819. About 5.7% of families and 8.5% of the population were below the poverty line, including 16.3% of those under age 18 and 3.4% of those age 65 or over.
The Baker Municipal Airport is southeast of Baker.[5]