Counties in Montana by median age, 2024

Name: Counties in Montana by median age, 2024
Creator: U.S. Census Bureau
License: Public domain (US federal government work, citation requested)

Meagher County had the highest median age of 56 counties in 2024, at 58.3 years. Roosevelt County had the lowest, at 30.9 years. The median was 44.3 years and the figure for Montana was 40.4 years. Source: the U.S. Census Bureau.

Highest58.3Meagher County

Lowest30.9Roosevelt County

Median44.356 counties

Montana40.4History

All counties, 2024

CSV Chart (SVG)

years. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

Rank	Counties	2024 years	Change on 2023
1	Meagher County	58.3	-1.6
2	Prairie County	57.8	+8.7
3	Carter County	56.9	+0.2
4	Sanders County	54.6	0
5	Daniels County	53.4	+4.7
6	McCone County	53.2	+0.8
7	Granite County	53	-0.9
8	Lincoln County	52.8	+0.2
9	Madison County	52.2	-1.9
10	Treasure County	52	-1.4
11	Petroleum County	51.6	+0.1
12	Musselshell County	51.3	0
13	Golden Valley County	50.9	-3.9
14	Carbon County	50.4	-0.1
15	Mineral County	50	-0.1
16	Deer Lodge County	49.9	+0.3
17	Ravalli County	48.7	-0.2
18	Powder River County	47.3	-1.3
19	Jefferson County	47.1	-0.2
20	Sweet Grass County	47	+3
21	Stillwater County	46.7	-0.7
22	Judith Basin County	46.2	-4.7
22	Wheatland County	46.2	-1.1
24	Park County	46	-0.2
25	Broadwater County	45.9	-0.3
26	Powell County	45.8	+2.5
27	Phillips County	45.6	+0.7
28	Fergus County	44.4	-0.9
29	Lake County	44.3	+0.5
29	Valley County	44.3	+1.1
31	Garfield County	43.3	-0.6
32	Beaverhead County	43.2	-0.2
33	Sheridan County	43.1	-1.6
34	Chouteau County	43	+0.1
34	Dawson County	43	-0.5
36	Custer County	42.7	+0.1
37	Teton County	42.3	-0.7
38	Flathead County	42.2	+0.1
39	Pondera County	42	+0.8
40	Lewis and Clark County	41.8	+0.5
41	Wibaux County	41	-3.2
42	Silver Bow County	40.5	+0.2
43	Liberty County	39.8	+2.3
44	Yellowstone County	39	+0.3
45	Cascade County	38.6	+0.3
46	Richland County	38.4	+0.4
47	Rosebud County	38	+1.3
48	Toole County	37.7	-1.1
49	Fallon County	37.5	+0.3
50	Missoula County	37.1	+0.1
51	Blaine County	35.6	+1.7
52	Hill County	34.5	+0.5
53	Gallatin County	34.2	+0.4
54	Glacier County	33.4	-0.8
55	Big Horn County	31.9	-0.4
56	Roosevelt County	30.9	+0.4

Other periods

2024
2023
2022
2021

About this ranking

Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

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 B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat. Retrieved 2026-10-08.

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Questions

Which county has the highest median age?

Meagher County, with 58.3 years in 2024, according to the U.S. Census Bureau.

Which county has the lowest median age?

Roosevelt County, with 30.9 years in 2024.

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 B01002: median age, total population. Retrieved 2026-10-08.