Ranking of Montana Counties By Population Aged 25 years and above with an Educational attainment of Less than High School Diploma in 2021 (ACS-5Yrs)
Updated on September 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the population of Montana (aged 25 years and above) who had an educational attainment of Less than High School Diploma was 42,160. Among all Montana counties, Yellowstone County had the highest population (aged 25 years and above) with an educational attainment of Less than High School Diploma (5,582), followed by Cascade County (4,058), and Flathead County (3,729).
The chart below shows the top 10 Montana counties, and the table below shows the ranking of all Montana counties.
You can see similar information for other educational attainments.
You can also see similar information for other states and for the United States.
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Related Topics: Montana ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates.
Ranking of Montana Counties By Population (Aged 25yrs+) with an Educational Attainment of Less than High School Diploma in 2021
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| Rank | County | Number of People |
|---|---|---|
| 1 | Yellowstone County | 5582 |
| 2 | Cascade County | 4058 |
| 3 | Flathead County | 3729 |
| 4 | Missoula County | 2918 |
| 5 | Ravalli County | 2425 |
| 6 | Lewis and Clark County | 2164 |
| 7 | Gallatin County | 1919 |
| 8 | Lake County | 1644 |
| 9 | Silver Bow County | 1503 |
| 10 | Lincoln County | 1288 |
| 11 | Glacier County | 965 |
| 12 | Hill County | 893 |
| 13 | Sanders County | 849 |
| 14 | Big Horn County | 789 |
| 15 | Deer Lodge County | 685 |
| 16 | Roosevelt County | 598 |
| 17 | Rosebud County | 556 |
| 18 | Powell County | 532 |
| 19 | Custer County | 507 |
| 20 | Jefferson County | 480 |
| 21 | Stillwater County | 469 |
| 22 | Park County | 453 |
| 23 | Fergus County | 399 |
| 24 | Blaine County | 394 |
| 25 | Liberty County | 386 |
| 26 | Toole County | 376 |
| 27 | Valley County | 372 |
| 28 | Carbon County | 361 |
| 29 | Pondera County | 355 |
| 30 | Beaverhead County | 348 |
| 30 | Richland County | 348 |
| 31 | Broadwater County | 336 |
| 32 | Dawson County | 328 |
| 33 | Chouteau County | 325 |
| 34 | Teton County | 315 |
| 35 | Musselshell County | 314 |
| 36 | Mineral County | 255 |
| 37 | Madison County | 243 |
| 38 | Granite County | 225 |
| 39 | Phillips County | 223 |
| 40 | Sheridan County | 188 |
| 41 | Wheatland County | 147 |
| 42 | Prairie County | 119 |
| 43 | Sweet Grass County | 102 |
| 44 | Fallon County | 94 |
| 45 | Daniels County | 92 |
| 46 | Powder River County | 80 |
| 47 | Carter County | 79 |
| 48 | Judith Basin County | 72 |
| 49 | Golden Valley County | 53 |
| 49 | McCone County | 53 |
| 49 | Wibaux County | 53 |
| 50 | Meagher County | 52 |
| 51 | Treasure County | 49 |
| 52 | Garfield County | 16 |
| 53 | Petroleum County | 2 |
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