Data / Rankings / High school graduate or higher, population 25 and over / Counties in Montana

Counties in Montana by high school graduate or higher, population 25 and over

Petroleum County had the highest high school graduate or higher, population 25 and over of 56 counties in 2021, at 99.4%. Liberty County had the lowest, at 72.6%. The median was 92.7% and the figure for Montana was 94.4%. Source: the U.S. Census Bureau.

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Highest99.4Petroleum County
Lowest72.6Liberty County
Median92.756 counties
Montana94.4History

Map of counties, 2021

Beaverhead County: 94.5 %Big Horn County: 89.4 %Blaine County: 90.7 %Broadwater County: 92.9 %Carbon County: 95.5 %Carter County: 92.3 %Cascade County: 93 %Chouteau County: 92.1 %Custer County: 94.1 %Daniels County: 92.9 %Dawson County: 95 %Deer Lodge County: 90.7 %Fallon County: 95.5 %Fergus County: 95.3 %Flathead County: 94.9 %Gallatin County: 97.5 %Garfield County: 97.6 %Glacier County: 88.6 %Golden Valley County: 91.6 %Granite County: 91 %Hill County: 91.2 %Jefferson County: 94.5 %Judith Basin County: 94.9 %Lake County: 92.3 %Lewis and Clark County: 95.6 %Liberty County: 72.6 %Lincoln County: 91.5 %McCone County: 96.1 %Madison County: 96.4 %Meagher County: 96.4 %Mineral County: 92.6 %Missoula County: 96.3 %Musselshell County: 91.4 %Park County: 96.6 %Petroleum County: 99.4 %Phillips County: 92.6 %Pondera County: 91.4 %Powder River County: 93.8 %Powell County: 90.2 %Prairie County: 87 %Ravalli County: 92.6 %Richland County: 95.4 %Roosevelt County: 90.4 %Rosebud County: 89.5 %Sanders County: 91 %Sheridan County: 92.6 %Silver Bow County: 93.8 %Stillwater County: 92.7 %Sweet Grass County: 96.1 %Teton County: 92.5 %Toole County: 89.5 %Treasure County: 91.1 %Valley County: 93 %Wheatland County: 90.6 %Wibaux County: 92.6 %Yellowstone County: 95 %
  • Under 91
  • 91 to 92
  • 92 to 93
  • 93 to 95
  • 95 to 96
  • 96 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Petroleum County: 99.4 %Petroleum County99.4Garfield County: 97.6 %Garfield County97.6Gallatin County: 97.5 %Gallatin County97.5Park County: 96.6 %Park County96.6Madison County: 96.4 %Madison County96.4Meagher County: 96.4 %Meagher County96.4Missoula County: 96.3 %Missoula County96.3McCone County: 96.1 %McCone County96.1Sweet Grass County: 96.1 %Sweet Grass County96.1Lewis and Clark County: 95.6 %Lewis and Clark County95.6Carbon County: 95.5 %Carbon County95.5Fallon County: 95.5 %Fallon County95.5Richland County: 95.4 %Richland County95.4Fergus County: 95.3 %Fergus County95.3Yellowstone County: 95 %Yellowstone County95Dawson County: 95 %Dawson County95Flathead County: 94.9 %Flathead County94.9Judith Basin County: 94.9 %Judith Basin County94.9Beaverhead County: 94.5 %Beaverhead County94.5Jefferson County: 94.5 %Jefferson County94.5Custer County: 94.1 %Custer County94.1Powder River County: 93.8 %Powder River County93.8Silver Bow County: 93.8 %Silver Bow County93.8Valley County: 93 %Valley County93Cascade County: 93 %Cascade County93Daniels County: 92.9 %Daniels County92.9Broadwater County: 92.9 %Broadwater County92.9Stillwater County: 92.7 %Stillwater County92.7Wibaux County: 92.6 %Wibaux County92.6Phillips County: 92.6 %Phillips County92.6Ravalli County: 92.6 %Ravalli County92.6Sheridan County: 92.6 %Sheridan County92.6Mineral County: 92.6 %Mineral County92.6Teton County: 92.5 %Teton County92.5Lake County: 92.3 %Lake County92.3Carter County: 92.3 %Carter County92.3Chouteau County: 92.1 %Chouteau County92.1Golden Valley County: 91.6 %Golden Valley County91.6Lincoln County: 91.5 %Lincoln County91.5Musselshell County: 91.4 %Musselshell County91.4Pondera County: 91.4 %Pondera County91.4Hill County: 91.2 %Hill County91.2Treasure County: 91.1 %Treasure County91.1Sanders County: 91 %Sanders County91Granite County: 91 %Granite County91Deer Lodge County: 90.7 %Deer Lodge County90.7Blaine County: 90.7 %Blaine County90.7Wheatland County: 90.6 %Wheatland County90.6Roosevelt County: 90.4 %Roosevelt County90.4Powell County: 90.2 %Powell County90.2Rosebud County: 89.5 %Rosebud County89.5Toole County: 89.5 %Toole County89.5Big Horn County: 89.4 %Big Horn County89.4Glacier County: 88.6 %Glacier County88.6Prairie County: 87 %Prairie County87Liberty County: 72.6 %Liberty County72.6Petroleum County: 99.4 %Petroleum County99.4Garfield County: 97.6 %Garfield County97.6Gallatin County: 97.5 %Gallatin County97.5Park County: 96.6 %Park County96.6Madison County: 96.4 %Madison County96.4Meagher County: 96.4 %Meagher County96.4Missoula County: 96.3 %Missoula County96.3McCone County: 96.1 %McCone County96.1Sweet Grass County: 96.1 %Sweet Grass County96.1Lewis and Clark County: 95.6 %Lewis and Clark County95.6Carbon County: 95.5 %Carbon County95.5Fallon County: 95.5 %Fallon County95.5Richland County: 95.4 %Richland County95.4Fergus County: 95.3 %Fergus County95.3Yellowstone County: 95 %Yellowstone County95Dawson County: 95 %Dawson County95Flathead County: 94.9 %Flathead County94.9Judith Basin County: 94.9 %Judith Basin County94.9Beaverhead County: 94.5 %Beaverhead County94.5Jefferson County: 94.5 %Jefferson County94.5Custer County: 94.1 %Custer County94.1Powder River County: 93.8 %Powder River County93.8Silver Bow County: 93.8 %Silver Bow County93.8Valley County: 93 %Valley County93Cascade County: 93 %Cascade County93Daniels County: 92.9 %Daniels County92.9Broadwater County: 92.9 %Broadwater County92.9Stillwater County: 92.7 %Stillwater County92.7Wibaux County: 92.6 %Wibaux County92.6Phillips County: 92.6 %Phillips County92.6Ravalli County: 92.6 %Ravalli County92.6Sheridan County: 92.6 %Sheridan County92.6Mineral County: 92.6 %Mineral County92.6Teton County: 92.5 %Teton County92.5Lake County: 92.3 %Lake County92.3Carter County: 92.3 %Carter County92.3Chouteau County: 92.1 %Chouteau County92.1Golden Valley County: 91.6 %Golden Valley County91.6Lincoln County: 91.5 %Lincoln County91.5Musselshell County: 91.4 %Musselshell County91.4Pondera County: 91.4 %Pondera County91.4Hill County: 91.2 %Hill County91.2Treasure County: 91.1 %Treasure County91.1Sanders County: 91 %Sanders County91Granite County: 91 %Granite County91Deer Lodge County: 90.7 %Deer Lodge County90.7Blaine County: 90.7 %Blaine County90.7Wheatland County: 90.6 %Wheatland County90.6Roosevelt County: 90.4 %Roosevelt County90.4Powell County: 90.2 %Powell County90.2Rosebud County: 89.5 %Rosebud County89.5Toole County: 89.5 %Toole County89.5Big Horn County: 89.4 %Big Horn County89.4Glacier County: 88.6 %Glacier County88.6Prairie County: 87 %Prairie County87Liberty County: 72.6 %Liberty County72.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Petroleum County99.4
2Garfield County97.6
3Gallatin County97.5
4Park County96.6
5Madison County96.4
6Meagher County96.4
7Missoula County96.3
8McCone County96.1
9Sweet Grass County96.1
10Lewis and Clark County95.6
11Carbon County95.5
12Fallon County95.5
13Richland County95.4
14Fergus County95.3
15Yellowstone County95
16Dawson County95
17Flathead County94.9
17Judith Basin County94.9
19Beaverhead County94.5
20Jefferson County94.5
21Custer County94.1
22Powder River County93.8
23Silver Bow County93.8
24Valley County93
25Cascade County93
26Daniels County92.9
27Broadwater County92.9
28Stillwater County92.7
29Wibaux County92.6
30Phillips County92.6
30Ravalli County92.6
30Sheridan County92.6
33Mineral County92.6
34Teton County92.5
35Lake County92.3
36Carter County92.3
37Chouteau County92.1
38Golden Valley County91.6
39Lincoln County91.5
40Musselshell County91.4
41Pondera County91.4
42Hill County91.2
43Treasure County91.1
44Sanders County91
45Granite County91
46Deer Lodge County90.7
47Blaine County90.7
48Wheatland County90.6
49Roosevelt County90.4
50Powell County90.2
51Rosebud County89.5
52Toole County89.5
53Big Horn County89.4
54Glacier County88.6
55Prairie County87
56Liberty County72.6

Other periods

About this ranking

People aged 25 and over who hold a regular high school diploma, a GED or alternative credential, or any higher level of education, as a percentage of all people aged 25 and over. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

Measures the adult population, not students: it is not the high school graduation rate of a class. Not comparable with the EU share below upper secondary education, which covers ages 25 to 64.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs (Counties in Montana by high school graduate or higher, population 25 and over, 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat

MLA 9

American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Montana by high school graduate or higher, population 25 and over, 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/montana-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. Counties in Montana by high school graduate or higher, population 25 and over, 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Also distributed by Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/montana-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs, Counties in Montana by high school graduate or higher, population 25 and over, 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat, via Invokely: https://invokely.ai/rankings/high-school-graduate-or-higher/montana-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_montana_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Montana by high school graduate or higher, population 25 and over, 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/montana-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs: Counties in Montana by high school graduate or higher, population 25 and over, 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat
L2  - https://invokely.ai/rankings/high-school-graduate-or-higher/montana-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/high-school-graduate-or-higher/montana-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b15003.dat. Retrieved 2026-10-12.
ER  -
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Rank Counties in Montana by high school graduate or higher, population 25 and over using official data, and cite the source.
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Questions

Which county has the highest high school graduate or higher, population 25 and over?

Petroleum County, with 99.4% in 2021, according to the U.S. Census Bureau.

Which county has the lowest high school graduate or higher, population 25 and over?

Liberty County, with 72.6% in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B15003: population 25 years and over with a high school diploma, GED or higher as a percentage of the population 25 years and over, calculated with stored inputs. Retrieved 2026-10-12.

High school graduate or higher, population 25 and over: other rankings

Counties in Montana: more rankings