Counties in Montana by median age

Name: Counties in Montana by median age, 2023
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 2023, at 59.9 years. Roosevelt County had the lowest, at 30.5 years. The median was 44.1 years and the figure for Montana was 40.2 years. Source: the U.S. Census Bureau.

Highest59.9Meagher County

Lowest30.5Roosevelt County

Median44.156 counties

Montana40.2History

All counties, 2023

CSV Chart (SVG)

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

Full ranking

Rank	Counties	2023 years	Change on 2022
1	Meagher County	59.9	+2.3
2	Carter County	56.7	-0.1
3	Golden Valley County	54.8	-0.1
4	Sanders County	54.6	-0.1
5	Madison County	54.1	-0.2
6	Granite County	53.9	-0.8
7	Treasure County	53.4	-0.9
8	Lincoln County	52.6	+0.1
9	McCone County	52.4	-1.6
10	Petroleum County	51.5	+1.9
11	Musselshell County	51.3	-0.7
12	Judith Basin County	50.9	+0.7
13	Carbon County	50.5	-0.2
14	Mineral County	50.1	-0.2
15	Deer Lodge County	49.6	0
16	Prairie County	49.1	+1.9
17	Ravalli County	48.9	-0.1
18	Daniels County	48.7	-3.7
19	Powder River County	48.6	-1.3
20	Stillwater County	47.4	-0.6
21	Jefferson County	47.3	-0.1
21	Wheatland County	47.3	-1.8
23	Broadwater County	46.2	-1.2
23	Park County	46.2	0
25	Fergus County	45.3	-1.4
26	Phillips County	44.9	-1
27	Sheridan County	44.7	+0.9
28	Wibaux County	44.2	-2.2
29	Sweet Grass County	44	+0.4
30	Garfield County	43.9	+1.9
31	Lake County	43.8	+0.1
32	Dawson County	43.5	+0.7
33	Beaverhead County	43.4	+1.1
34	Powell County	43.3	-2.2
35	Valley County	43.2	0
36	Teton County	43	+0.6
37	Chouteau County	42.9	+0.5
38	Custer County	42.6	-0.2
39	Flathead County	42.1	-0.2
40	Lewis and Clark County	41.3	+0.1
41	Pondera County	41.2	-0.4
42	Silver Bow County	40.3	0
43	Toole County	38.8	-1.6
44	Yellowstone County	38.7	+0.3
45	Cascade County	38.3	+0.4
46	Richland County	38	-0.3
47	Liberty County	37.5	+0.6
48	Fallon County	37.2	0
49	Missoula County	37	+0.3
50	Rosebud County	36.7	+0.3
51	Glacier County	34.2	0
52	Hill County	34	+0.6
53	Blaine County	33.9	+0.3
54	Gallatin County	33.8	+0.3
55	Big Horn County	32.3	+0.7
56	Roosevelt County	30.5	+0.1

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/2023/table-based-SF/data/5YRData/acsdt5y2023-b01002.dat. Retrieved 2026-10-08.

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Questions

Which county has the highest median age?

Meagher County, with 59.9 years in 2023, according to the U.S. Census Bureau.

Which county has the lowest median age?

Roosevelt County, with 30.5 years in 2023.

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.