Which county has the lowest median age?

Madison County, Idaho ranks #1 with 20.0 (1990 Decennial Census).

What are the top 5 counties by median age?

Madison County, Idaho, Todd County, South Dakota, Radford, Virginia, Buffalo County, South Dakota, Utah County, Utah.

How many counties are in this ranking?

3,122 counties qualify after filtering for population minimums and data availability. The ranking covers 1990 Decennial Census data.

How is median age measured?

Median age of all residents. Source: US Census Bureau, 1990 Decennial Census.

RANKING · 1990 CENSUS · 122 SHOWN OF 3,122

Youngest by median age, US counties · 1990

US counties with the youngest median age (1990 ACS).

Flip the list · Oldest by median age, US counties →

All statesAll rankings

SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS –

3001Marshall County, OKOK16,25541.0–

3002Montmorency County, MIMI9,84241.0–

3003Greer County, OKOK5,37341.0–

3004Henderson County, NCNC122,37541.0–

3005Delta County, COCO32,17841.0–

3006Knox County, MOMO3,72841.0–

3007Jefferson County, WAWA33,97041.1–

3008Garfield County, WAWA2,41641.1–

3009Cleburne County, ARAR25,67241.1–

3010Traverse County, MNMN3,13041.1–

3011Bent County, COCO5,71641.2–

3012Jerauld County, SDSD1,65441.2–

3013Daniels County, MTMT1,61241.3–

3014Foard County, TXTX1,04441.3–

3015Boyd County, NENE1,67441.3–

3016Harlan County, NENE3,00041.3–

3017Monona County, IAIA8,53941.3–

3018Donley County, TXTX3,21341.4–

3019De Baca County, NMNM1,64741.4–

3020Greenwood County, KSKS5,82641.4–

3021Trinity County, TXTX14,38441.4–

3022Bosque County, TXTX18,91841.5–

3023Menard County, TXTX1,95641.5–

3024Hutchinson County, SDSD7,41341.5–

3025Cottle County, TXTX1,22441.5–

3026Fall River County, SDSD7,46741.6–

3027Camden County, MOMO44,04741.6–

3028Coleman County, TXTX7,91541.7–

3029Furnas County, NENE4,52441.8–

3030Comanche County, KSKS1,67341.8–

3031Ozark County, MOMO9,17241.8–

3032Cheyenne County, KSKS2,60441.8–

3033Wayne County, IAIA6,73841.8–

3034Franklin County, NENE2,79541.9–

3035Lincoln County, KSKS2,86141.9–

3036Cedar County, MOMO14,88842.0–

3037Sheridan County, NDND1,29642.0–

3038Woodson County, KSKS3,11842.0–

3039Thayer County, NENE4,84242.1–

3040Morgan County, MOMO22,41842.1–

3041Gillespie County, TXTX28,52742.1–

3042Putnam County, MOMO4,54642.2–

3043Lee County, FLFL875,60742.2–

3044Sullivan County, MOMO5,73842.2–

3045McIntosh County, OKOK19,75842.2–

3046Motley County, TXTX1,04342.2–

3047Pinellas County, FLFL948,56342.3–

3048Harrison County, MOMO8,28142.3–

3049St. Clair County, MOMO9,97642.3–

3050Burke County, NDND2,13242.4–

3051Ringgold County, IAIA4,64242.4–

3052Wells County, NDND3,72942.4–

3053Garden County, NENE1,80442.4–

3054Iron County, WIWI6,12742.5–

3055Jewell County, KSKS2,83042.5–

3056Yavapai County, AZAZ252,55242.5–

3057Aitkin County, MNMN16,25242.6–

3058Marion County, ARAR17,59342.6–

3059Kimble County, TXTX4,43842.6–

3060Stone County, MOMO32,50342.6–

3061Polk County, NCNC20,53342.8–

3062Mills County, TXTX4,58042.8–

3063Worth County, MOMO1,91442.8–

3064Mercer County, MOMO3,40442.9–

3065Osborne County, KSKS3,28542.9–

3066Macon County, NCNC39,23242.9–

3067Real County, TXTX2,74542.9–

3068Dickens County, TXTX1,69242.9–

3069Middlesex County, VAVA10,84142.9–

3070Mason County, TXTX3,99042.9–

3071Rush County, KSKS2,84543.1–

3072Coke County, TXTX3,41243.1–

3073Hall County, TXTX2,73743.1–

3074Manatee County, FLFL468,20043.2–

3075Towns County, GAGA13,28543.2–

3076Logan County, NDND1,85943.2–

3077Vilas County, WIWI23,76143.3–

3078Prairie County, MTMT1,11243.3–

3079San Juan County, WAWA18,57743.4–

3080Wheeler County, OROR1,47243.4–

3081Hamilton County, TXTX8,68043.5–

3082Iron County, MIMI11,75743.5–

3083Webster County, NENE3,33643.5–

3084Baylor County, TXTX3,47243.7–

3085Van Buren County, ARAR16,23843.7–

3086Sierra County, CACA3,09843.7–

3087Hooker County, NENE68643.8–

3088Indian River County, FLFL172,79943.8–

3089Chautauqua County, KSKS3,32143.8–

3090Izard County, ARAR14,40543.9–

3091Curry County, OROR22,62143.9–

3092Pawnee County, NENE2,51043.9–

3093Republic County, KSKS4,64044.0–

3094Divide County, NDND2,11044.3–

3095Martin County, FLFL166,27244.3–

3096Benton County, MOMO20,53644.6–

3097Roscommon County, MIMI23,91444.6–

3098Lake County, FLFL456,06844.6–

3099Mathews County, VAVA8,52944.7–

3100Northumberland County, VAVA12,55744.9–

3101Sharp County, ARAR18,12245.0–

3102Alcona County, MIMI10,55645.2–

3103Nelson County, NDND2,96345.3–

3104Lancaster County, VAVA10,99545.4–

3105Sabine County, TXTX10,01245.4–

3106Smith County, KSKS3,56645.5–

3107Keweenaw County, MIMI2,18646.1–

3108Flagler County, FLFL140,36046.1–

3109McPherson County, SDSD2,34746.6–

3110Elk County, KSKS2,45846.7–

3111Baxter County, ARAR42,98247.5–

3112Pasco County, FLFL674,51648.1–

3113Sarasota County, FLFL479,95848.9–

3114McIntosh County, NDND2,45148.9–

3115Hernando County, FLFL221,70149.7–

3116Citrus County, FLFL171,66650.7–

3117Hickory County, MOMO9,04450.8–

3118Sierra County, NMNM11,39551.3–

3119Highlands County, FLFL111,12251.4–

3120Charlotte County, FLFL217,21253.7–

3121Llano County, TXTX23,35355.6–

3122Kalawao County, HIHI8262.6–

SHOWING 3,001–3,122 OF 3,122

1 2 3 4 5 6 7

Download CSV (full list, 3,122 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS