| County: | Phillips County |
| State: | Montana |
| Founded Date: | February 5 |
| Founded Year: | 1915 |
| Seat Wl: | Malta |
| Largest City Wl: | Malta |
| Area Total Sq Mi: | 5212 |
| Area Land Sq Mi: | 5140 |
| Area Water Sq Mi: | 72 |
| Area Percentage: | 1.4 |
| Population As Of: | 2020 |
| Population Total: | 4217 |
| Pop Est As Of: | 2022 |
| Population Est: | 4240 |
| Population Density Sq Mi: | auto |
| Ex Image: | Phillips County Courthouse Malta.JPG |
| Ex Image Cap: | Phillips County Courthouse in Malta |
| District: | 2nd |
| Time Zone: | Mountain |
| Footnotes: |
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Phillips County is a county in the U.S. state of Montana. As of the 2020 census, the population was 4,217.[1] Its county seat is Malta.[2] Before February 5, 1915, Phillips County was part of Blaine County, and before 1912 both were part of Chouteau County.[3] It was named for rancher and state senator Benjamin D. Phillips.
Its northern boundary is the Canada–United States border with Saskatchewan. The Missouri River defines its southern boundary.
According to the United States Census Bureau, the county has a total area of, of which is land and (1.4%) is water.[4] It is the second-largest county in Montana by land area and third-largest by total area.
As of the 2020 census, there were 4,217 people living in the county.
As of the 2010 census, there were 4,253 people, 1,819 households, and 1,159 families residing in the county. The population density was . There were 2,335 housing units at an average density of . The racial makeup of the county was 87.0% white, 8.3% American Indian, 0.2% Asian, 0.4% from other races, and 4.0% from two or more races. Those of Hispanic or Latino origin made up 1.9% of the population. In terms of ancestry, 26.2% were Norwegian, 24.3% were German, 13.4% were Irish, 10.1% were American, and 9.0% were English.
Of the 1,819 households, 27.6% had children under the age of 18 living with them, 52.9% were married couples living together, 7.4% had a female householder with no husband present, 36.3% were non-families, and 32.2% of all households were made up of individuals. The average household size was 2.27 and the average family size was 2.86. The median age was 46.8 years.
The median income for a household in the county was $36,453 and the median income for a family was $55,362. Males had a median income of $41,826 versus $26,417 for females. The per capita income for the county was $24,227. About 11.4% of families and 13.5% of the population were below the poverty line, including 17.1% of those under age 18 and 4.8% of those age 65 or over.
From its creation until 1964, voters of Phillips County were fairly balanced; they selected Democratic Party candidates in 58% of national elections. After 1964 the Republican presidential candidate has garnered the county's vote in every election.