US Census Data

Oldest by median age in Idaho

Idaho counties and cities ranked by median age.

This page ranks the counties and cities of Idaho by median age — which have the highest median age, according to the US Census Bureau's American Community Survey 5-year estimates.

Among counties, Custer County leads at 59.5 yrs.

Among cities & places, Lost River leads at 76.1 yrs.

Counties

#NameMedian age
1Custer County59.5 yrs
2Adams County54.3 yrs
3Boise County53.5 yrs
4Lemhi County53.1 yrs
5Clearwater County52.0 yrs
6Idaho County49.6 yrs
7Valley County49.0 yrs
8Lewis County48.9 yrs
9Bonner County48.2 yrs
10Benewah County46.0 yrs
11Blaine County45.5 yrs
12Shoshone County45.1 yrs
13Washington County44.6 yrs
14Boundary County42.8 yrs
15Gem County42.8 yrs
16Nez Perce County40.9 yrs
17Kootenai County40.8 yrs
18Bear Lake County40.2 yrs
19Oneida County40.2 yrs
20Fremont County39.9 yrs
21Teton County39.8 yrs
22Butte County39.2 yrs
23Payette County38.8 yrs
24Gooding County38.4 yrs
25Ada County38.3 yrs
26Owyhee County38.3 yrs
27Caribou County38.0 yrs
28Lincoln County37.2 yrs
29Twin Falls County35.8 yrs
30Bannock County35.0 yrs
31Camas County34.9 yrs
32Bingham County34.8 yrs
33Canyon County34.8 yrs
34Minidoka County34.5 yrs
35Power County33.9 yrs
36Jerome County33.6 yrs
37Clark County33.4 yrs
38Bonneville County33.3 yrs
39Cassia County33.1 yrs
40Elmore County32.5 yrs
41Franklin County32.5 yrs
42Jefferson County32.3 yrs
43Latah County30.7 yrs
44Madison County21.4 yrs

Cities & places

Top 100.
#NameMedian age
1Lost River76.1 yrs
2Stanley73.1 yrs
3White Bird72.3 yrs
4Butte City69.5 yrs
5Placerville69.5 yrs
6Smiths Ferry69.2 yrs
7Conkling Park68.3 yrs
8Island Park67.0 yrs
9Spencer66.5 yrs
10Blanchard66.4 yrs
11Princeton66.0 yrs
12Lowman65.7 yrs
13Riggins65.0 yrs
14Hammett63.1 yrs
15Weippe62.4 yrs
16Elk River62.3 yrs
17Fernan Lake Village62.0 yrs
18Mackay61.1 yrs
19Bennington60.3 yrs
20Sun Valley59.8 yrs
21Harrison58.4 yrs
22East Hope58.3 yrs
23Council58.0 yrs
24Tensed58.0 yrs
25Irwin57.4 yrs
26Craigmont57.3 yrs
27Peck57.1 yrs
28Pierce56.7 yrs
29Rockford Bay56.7 yrs
30Kendrick56.4 yrs
31Kooskia55.8 yrs
32Crouch55.4 yrs
33Robie Creek55.3 yrs
34Parkline54.5 yrs
35Stites54.5 yrs
36Dover54.4 yrs
37Dalton Gardens54.3 yrs
38Winchester54.2 yrs
39Culdesac54.1 yrs
40Hamer54.1 yrs
41Cambridge54.0 yrs
42Ketchum54.0 yrs
43Sweetwater53.8 yrs
44Cascade53.5 yrs
45Donnelly53.5 yrs
46Murphy53.4 yrs
47Bovill53.2 yrs
48Kamiah53.0 yrs
49Hagerman52.9 yrs
50Leadore51.9 yrs
51Lava Hot Springs51.5 yrs
52Juliaetta51.4 yrs
53Letha51.3 yrs
54Hauser50.6 yrs
55Arbon Valley50.5 yrs
56Mullan50.0 yrs
57Avimor49.8 yrs
58Hayden Lake49.4 yrs
59Yellow Pine49.4 yrs
60Smelterville49.2 yrs
61Laclede48.2 yrs
62Grangeville48.1 yrs
63Horseshoe Bend46.5 yrs
64Salmon46.5 yrs
65Eagle46.1 yrs
66Marsing46.0 yrs
67Gannett45.9 yrs
68Midvale45.9 yrs
69Deary45.6 yrs
70Challis44.9 yrs
71Troy44.7 yrs
72Glenns Ferry44.6 yrs
73Grand View44.5 yrs
74Garden City44.0 yrs
75Priest River43.3 yrs
76Swan Valley43.3 yrs
77Hayden43.1 yrs
78St. Charles43.0 yrs
79Bancroft42.8 yrs
80Acequia42.5 yrs
81Osburn42.5 yrs
82Hailey42.4 yrs
83Orofino42.4 yrs
84Albion42.0 yrs
85Hidden Springs41.8 yrs
86Malta41.8 yrs
87Bliss41.6 yrs
88Sandpoint41.5 yrs
89McCammon41.4 yrs
90Menan40.9 yrs
91Ashton40.8 yrs
92Athol40.7 yrs
93Wallace40.7 yrs
94Bloomington40.6 yrs
95Pinehurst40.6 yrs
96Silverton40.6 yrs
97Star40.6 yrs
98Clark Fork40.4 yrs
99Elk City40.4 yrs
100Castleford40.1 yrs

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