Which county has the highest population change?

Harris County, Texas ranks #1 with +638,686 (2020 Decennial Census).

What are the top 5 counties by population change?

Harris County, Texas, Maricopa County, Arizona, King County, Washington, Clark County, Nevada, Tarrant County, Texas.

How many counties are in this ranking?

3,131 counties qualify after filtering for population minimums and data availability. The ranking covers 2020 Decennial Census data.

How is population change measured?

Change in the number of residents from the prior decennial census (raw count, not a percentage). Source: US Census Bureau, 2020 Decennial Census.

RANKING · 2020 CENSUS · 131 SHOWN OF 3,131

Most population gained, US counties · 2020

US counties that added the most residents from the 2010 census to 2020, by raw count of people rather than percentage.

Flip the list · Most population lost, US counties →

All statesAll rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

3001Armstrong County, PAPA63,698-3,383+212%

3002Grant County, ININ66,524-3,387+342%

3003Marshall County, MSMS34,654-3,392−173%

3004Williamsburg County, SCSC29,662-3,397−945%

3005Lee County, VAVA21,642-3,414+276%

3006Ripley County, MOMO10,717-3,421−384%

3007Madison County, ILIL263,110-3,423−135%

3008St. Lawrence County, NYNY105,488-3,439+7898%

3009St. John the Baptist Parish, LALA39,875-3,447−213%

3010Fulton County, ILIL32,901-3,460−2135%

3011Chesterfield County, SCSC44,740-3,461−183%

3012Ouachita County, ARAR21,731-3,470+95%

3013Sunflower County, MSMS22,893-3,479−332%

3014Wayne County, WVWV37,309-3,499−376%

3015Floyd County, KYKY34,401-3,509+206%

3016Livingston County, NYNY61,438-3,559−282%

3017Vernon Parish, LALA45,091-3,584−62%

3018Somerset County, PAPA72,004-3,613−300%

3019Dunklin County, MOMO26,855-3,670−8635%

3020Delaware County, NYNY44,305-3,672−542%

3021Richmond County, NCNC42,041-3,693−280%

3022Dooly County, GAGA11,156-3,710−328%

3023Otsego County, NYNY60,589-3,735−422%

3024Buchanan County, VAVA18,492-3,743−14%

3025Hale County, TXTX31,819-3,751−294%

3026Dillon County, SCSC27,458-3,770−334%

3027Cayuga County, NYNY74,365-3,778+979%

3028Niagara County, NYNY208,912-3,803+318%

3029Clarendon County, SCSC31,043-3,827−194%

3030Marion County, SCSC28,242-3,879−348%

3031Belmont County, OHOH64,434-3,903+360%

3032Bay County, MIMI102,123-3,915+150%

3033Ashtabula County, OHOH96,713-3,923−235%

3034La Paz County, AZAZ16,711-3,932−167%

3035Leflore County, MSMS25,686-3,978−756%

3036Montgomery County, KSKS30,177-3,985+55%

3037Telfair County, GAGA11,195-4,023−607%

3038Franklin County, NYNY46,500-4,044−188%

3039Warren County, MSMS41,759-4,051−330%

3040Tazewell County, ILIL130,049-4,051−185%

3041Allen County, OHOH100,881-4,125+222%

3042Logan County, WVWV30,375-4,176−22%

3043Acadia Parish, LALA57,032-4,197−241%

3044Lawrence County, OHOH55,710-4,210−968%

3045Webster Parish, LALA34,948-4,240+2584%

3046LaSalle County, ILIL107,773-4,266−193%

3047Blair County, PAPA119,541-4,267+205%

3048Raleigh County, WVWV71,775-4,268−278%

3049Lenoir County, NCNC55,837-4,373−284%

3050Herkimer County, NYNY59,219-4,380+220%

3051Sampson County, NCNC61,504-4,395−134%

3052Buchanan County, MOMO83,540-4,408−251%

3053Jefferson County, OHOH63,597-4,460−30%

3054Venango County, PAPA49,346-4,530+149%

3055Oswego County, NYNY118,569-4,584−856%

3056Bell County, KYKY22,829-4,594+218%

3057Northampton County, NCNC16,491-4,628−459%

3058Tazewell County, VAVA38,635-4,649+241%

3059Muskogee County, OKOK66,708-4,651−439%

3060Peoria County, ILIL178,553-4,664−870%

3061Chemung County, NYNY80,415-4,682+14%

3062DeKalb County, ILIL101,835-4,740−143%

3063Coahoma County, MSMS19,849-4,761+356%

3064Aroostook County, MEME66,609-4,765−63%

3065Norfolk, VAVA231,013-4,798−82%

3066Crawford County, PAPA81,792-4,827−215%

3067Anson County, NCNC21,758-4,893−372%

3068Susquehanna County, PAPA38,237-4,922−365%

3069Lawrence County, PAPA83,911-5,038+214%

3070Sussex County, NJNJ148,063-5,044−138%

3071St. Francis County, ARAR21,800-5,168−721%

3072Phillips County, ARAR14,255-5,189+117%

3073Schuylkill County, PAPA145,085-5,240+133%

3074St. Mary Parish, LALA46,552-5,244+14%

3075Wayne County, NCNC122,278-5,290−161%

3076Wise County, VAVA34,824-5,322−1068%

3077Dallas County, ALAL35,140-5,358+204%

3078McDonough County, ILIL25,916-5,374+131%

3079Steuben County, NYNY91,855-5,406+1393%

3080Madison County, NYNY67,120-5,426−1790%

3081Scioto County, OHOH71,365-5,491+385%

3082Apache County, AZAZ64,445-5,497−170%

3083Fayette County, WVWV38,165-5,551+1388%

3084Bladen County, NCNC30,007-5,584−254%

3085Indiana County, PAPA82,878-5,634+1348%

3086Delaware County, ININ113,106-5,768+548%

3087Darlington County, SCSC62,888-5,776−204%

3088Mississippi County, ARAR37,828-5,795+4%

3089Cochise County, AZAZ126,332-5,899−129%

3090Isabella County, MIMI64,691-5,917−168%

3091Kankakee County, ILIL105,525-5,947−178%

3092Columbiana County, OHOH99,377-5,964−257%

3093Mercer County, PAPA107,860-5,986+743%

3094Halifax County, NCNC46,534-6,069−427%

3095Washington County, MSMS40,446-6,215+25%

3096Pike County, KYKY54,721-6,355+65%

3097Macon County, ILIL99,300-6,770+171%

3098Allegany County, MDMD66,848-6,981+43531%

3099Coles County, ILIL46,607-7,010−552%

3100Jackson County, ILIL52,501-7,244+398%

3101Chautauqua County, NYNY124,126-7,248+238%

3102Lauderdale County, MSMS70,317-7,277−379%

3103Vermilion County, ILIL71,259-7,437+71%

3104Columbus County, NCNC50,487-7,475−245%

3105Edgecombe County, NCNC49,121-7,652+704%

3106Fayette County, PAPA123,021-7,802−337%

3107Milwaukee County, WIWI924,216-8,246−57%

3108Orangeburg County, SCSC83,177-8,278−222%

3109Trumbull County, OHOH198,972-8,335+209%

3110Butte County, CACA209,211-8,368−140%

3111San Juan County, NMNM120,340-8,383−138%

3112Dougherty County, GAGA82,616-8,775+3467%

3113Erie County, PAPA265,832-9,690−284%

3114Duplin County, NCNC51,571-9,790−208%

3115Winnebago County, ILIL283,674-9,916−139%

3116Saginaw County, MIMI187,688-10,045+427%

3117Jefferson County, ARAR62,987-10,175+742%

3118Cambria County, PAPA128,968-10,207−2%

3119Mahoning County, OHOH224,706-10,209+41%

3120Westmoreland County, PAPA349,324-10,506+3103%

3121Lucas County, OHOH423,347-10,536+44%

3122Kanawha County, WVWV172,381-12,318+63%

3123St. Clair County, ILIL250,708-12,656+87%

3124Cuyahoga County, OHOH1,232,925-15,305−16%

3125Caddo Parish, LALA224,226-17,121−538%

3126Hinds County, MSMS211,888-17,543+382%

3127Robeson County, NCNC119,941-17,638−197%

3128St. Louis, MOMO278,144-17,716−63%

3129Genesee County, MIMI401,093-19,579−445%

3130Wayne County, MIMI1,769,038-27,023−47%

3131Baltimore, MDMD569,997-35,253−58%

SHOWING 3,001–3,131 OF 3,131

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