Which county has the highest population density?

New York County, New York ranks #1 with 65,652 (1990 Decennial Census).

What are the top 5 counties by population density?

New York County, New York, Kings County, New York, Bronx County, New York, Queens County, New York, San Francisco County, California.

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 population density measured?

Residents per square mile of land area. Source: US Census Bureau, 1990 Decennial Census.

RANKING · 1990 CENSUS · 122 SHOWN OF 3,122

Most densely populated, US counties · 1990

US counties ranked by residents per square mile (1990).

Flip the list · Most sparsely populated, US counties →

All statesAll rankings

SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS –

3001Sweet Grass County, MTMT3,7622–

3002Corson County, SDSD3,7812–

3003Stanley County, SDSD3,0182–

3004Piute County, UTUT1,5092–

3005Rich County, UTUT2,6872–

3006Valley County, MTMT7,3852–

3007Millard County, UTUT14,0572–

3008Madison County, MTMT10,0262–

3009Valley County, IDID12,8312–

3010Wheeler County, NENE7892–

3011Mellette County, SDSD2,1372–

3012Idaho County, IDID17,8742–

3013San Juan County, UTUT14,5422–

3014Glasscock County, TXTX1,1282–

3015Matanuska-Susitna, AKAK118,6662–

3016Liberty County, MTMT1,9572–

3017Blaine County, MTMT6,8602–

3018Daniels County, MTMT1,6122–

3019Wheatland County, MTMT2,1002–

3020Sully County, SDSD1,4792–

3021Sterling County, TXTX1,3492–

3022Irion County, TXTX1,4632–

3023Motley County, TXTX1,0432–

3024Logan County, NENE6692–

3025Beaverhead County, MTMT10,0432–

3026Oldham County, TXTX1,7832–

3027Lemhi County, IDID8,4742–

3028Jackson County, SDSD2,6662–

3029Alpine County, CACA1,0432–

3030Johnson County, WYWY8,9081–

3031Granite County, MTMT3,6581–

3032Saguache County, COCO6,7321–

3033Crockett County, TXTX2,7691–

3034Haakon County, SDSD1,8021–

3035Garden County, NENE1,8041–

3036Gilliam County, OROR1,9711–

3037Dolores County, COCO2,4661–

3038Brewster County, TXTX9,4581–

3039Chouteau County, MTMT5,8651–

3040Guadalupe County, NMNM4,3431–

3041Perkins County, SDSD2,8531–

3042Jones County, SDSD9131–

3043Cheyenne County, COCO1,7131–

3044Wibaux County, MTMT8851–

3045Humboldt County, NVNV17,2671–

3046Keya Paha County, NENE7921–

3047Butte County, IDID2,7831–

3048Kane County, UTUT8,5971–

3049Judith Basin County, MTMT2,1621–

3050Loup County, NENE5701–

3051Thomas County, NENE6391–

3052Banner County, NENE6861–

3053Lander County, NVNV5,8721–

3054Ziebach County, SDSD2,3891–

3055Kent County, TXTX6741–

3056Roberts County, TXTX8671–

3057Hooker County, NENE6861–

3058Owyhee County, IDID12,6611–

3059Union County, NMNM3,8441–

3060Edwards County, TXTX1,3701–

3061Cherry County, NENE5,5611–

3062White Pine County, NVNV8,6611–

3063Phillips County, MTMT4,2031–

3064Jackson County, COCO1,2111–

3065Sublette County, WYWY8,9291–

3066Daggett County, UTUT9341–

3067Grant County, NENE5611–

3068Nye County, NVNV57,3361–

3069De Baca County, NMNM1,6471–

3070Billings County, NDND1,0711–

3071Kiowa County, COCO1,4121–

3072Niobrara County, WYWY2,3411–

3073Blaine County, NENE4581–

3074Haines, AKAK2,0681–

3075Treasure County, MTMT7281–

3076Culberson County, TXTX2,2671–

3077Borden County, TXTX5671–

3078Wayne County, UTUT2,5871–

3079Lake County, OROR8,1871–

3080McCone County, MTMT1,7201–

3081Jeff Davis County, TXTX1,7111–

3082Custer County, IDID4,6361–

3083Wheeler County, OROR1,4721–

3084Prairie County, MTMT1,1121–

3085Golden Valley County, MTMT8441–

3086Garfield County, UTUT5,2561–

3087Meagher County, MTMT2,1371–

3088Sioux County, NENE1,1881–

3089Slope County, NDND6281–

3090Pershing County, NVNV6,4211–

3091McMullen County, TXTX5441–

3092Harney County, OROR7,3801–

3093Camas County, IDID1,3161–

3094Arthur County, NENE3961–

3095Hudspeth County, TXTX3,4331–

3096Mineral County, COCO9101–

3097McPherson County, NENE3691–

3098Powder River County, MTMT1,7811–

3099Harding County, SDSD1,3311–

3100Terrell County, TXTX7021–

3101Harding County, NMNM6170–

3102Carter County, MTMT1,3830–

3103Clark County, IDID7830–

3104Hinsdale County, COCO7530–

3105King County, TXTX1920–

3106Esmeralda County, NVNV7290–

3107Eureka County, NVNV1,8670–

3108Catron County, NMNM3,8270–

3109Nome Census Area, AKAK9,8300–

3110Lincoln County, NVNV4,3200–

3111Aleutians East, AKAK3,4790–

3112Garfield County, MTMT1,1480–

3113Bethel Census Area, AKAK18,3910–

3114Kenedy County, TXTX3190–

3115Petroleum County, MTMT5480–

3116Southeast Fairbanks Census Area, AKAK7,2700–

3117Dillingham Census Area, AKAK4,4830–

3118Northwest Arctic, AKAK7,0950–

3119Loving County, TXTX520–

3120Lake and Peninsula, AKAK1,3570–

3121North Slope, AKAK10,5820–

3122Yukon-Koyukuk Census Area, AKAK5,0280–

SHOWING 3,001–3,122 OF 3,122

1 2 3 4 5 6 7

Download CSV (full list, 3,122 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS