# Counties in Montana by average household size, 2024

All 56 values come from U.S. Census Bureau for 2024, so the places are comparable.

- Indicator id: `average_household_size`
- Unit: persons per household
- Definition: Average number of persons per private household. EU countries: EU-SILC. United States: American Community Survey five-year estimate of people in households divided by occupied housing units, where the period shown is the last year of the five-year span.
- Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B25010: average household size of occupied housing units (https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat)
- Publisher page: https://invokely.ai/en/publishers/us-census-bureau
- Retrieved: 2026-10-12
- Citation: U.S. Census Bureau. American Community Survey 5-year estimates, table B25010: average household size of occupied housing units. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25010.dat. Retrieved 2026-10-12.
- Web page: https://invokely.ai/rankings/average-household-size/montana-counties

| Rank | Place | persons per household |
|---:|---|---:|
| 1 | Big Horn County | 3.3 |
| 1 | Roosevelt County | 3.3 |
| 3 | Glacier County | 3 |
| 4 | Blaine County | 3 |
| 5 | Broadwater County | 2.7 |
| 6 | Chouteau County | 2.7 |
| 7 | Rosebud County | 2.6 |
| 8 | Pondera County | 2.6 |
| 9 | Lake County | 2.6 |
| 10 | Hill County | 2.5 |
| 10 | Richland County | 2.5 |
| 12 | Liberty County | 2.5 |
| 12 | Wibaux County | 2.5 |
| 14 | Garfield County | 2.5 |
| 14 | Jefferson County | 2.5 |
| 14 | Valley County | 2.5 |
| 17 | Powder River County | 2.5 |
| 17 | Ravalli County | 2.5 |
| 19 | Flathead County | 2.5 |
| 20 | Teton County | 2.4 |
| 21 | Madison County | 2.4 |
| 21 | Sheridan County | 2.4 |
| 23 | Sanders County | 2.4 |
| 23 | Toole County | 2.4 |
| 25 | Stillwater County | 2.4 |
| 26 | Musselshell County | 2.4 |
| 26 | Sweet Grass County | 2.4 |
| 26 | Yellowstone County | 2.4 |
| 29 | Carbon County | 2.4 |
| 30 | Dawson County | 2.3 |
| 30 | Gallatin County | 2.3 |
| 32 | Golden Valley County | 2.3 |
| 33 | Cascade County | 2.3 |
| 33 | Lewis and Clark County | 2.3 |
| 33 | Lincoln County | 2.3 |
| 36 | Phillips County | 2.3 |
| 37 | Custer County | 2.3 |
| 37 | Fallon County | 2.3 |
| 37 | Mineral County | 2.3 |
| 40 | Judith Basin County | 2.3 |
| 41 | Prairie County | 2.2 |
| 41 | Silver Bow County | 2.2 |
| 43 | Missoula County | 2.2 |
| 44 | Powell County | 2.2 |
| 45 | Beaverhead County | 2.2 |
| 45 | Granite County | 2.2 |
| 47 | Wheatland County | 2.2 |
| 48 | Carter County | 2.1 |
| 49 | Meagher County | 2.1 |
| 50 | Fergus County | 2.1 |
| 51 | Park County | 2.1 |
| 52 | McCone County | 2 |
| 53 | Treasure County | 2 |
| 54 | Petroleum County | 2 |
| 55 | Daniels County | 2 |
| 56 | Deer Lodge County | 2 |