Which county has the highest population change?

Harris County, Texas ranks #1 with +313,881 (2025 Census Population Estimates).

What are the top 5 counties by population change?

Harris County, Texas, Maricopa County, Arizona, Collin County, Texas, Denton County, Texas, Montgomery County, Texas.

How many counties are in this ranking?

3,135 counties qualify after filtering for population minimums and data availability. The ranking covers 2025 Census population estimates.

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, Population Estimates Program (2025).

RANKING · 2025 ESTIMATES · 135 SHOWN OF 3,135

Most population gained, US counties

US counties that added the most residents from the 2020 census to 2025, 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

3001▼57Greene County, PAPA33,885-2,069−284%

3002▲92Halifax County, NCNC46,534-2,088−213%

3003▼100Harlan County, KYKY24,725-2,106−38%

3004▼15Mingo County, WVWV21,455-2,113−61%

3005▲13Somerset County, PAPA72,004-2,125−218%

3006▼82Union County, ARAR36,926-2,128+95%

3007▲59Crawford County, PAPA81,792-2,146−151%

3008▲61Lawrence County, PAPA83,911-2,159+35%

3009▼84Mercer County, WVWV57,503-2,161+8%

3010▼2,316Charlottesville, VAVA44,388-2,165−146%

3011▼448Sangamon County, ILIL194,170-2,173−121%

3012▼127Beaver County, PAPA166,032-2,183−53%

3013▲29Logan County, WVWV30,375-2,192−59%

3014▼2,837Boulder County, COCO328,560-2,198−103%

3015▼53Knox County, ILIL47,767-2,200+295%

3016▼2,412Jefferson County, TXTX254,321-2,205−117%

3017▼51McDowell County, WVWV16,878-2,233−72%

3018▲54Phillips County, ARAR14,255-2,313−3%

3019▲64Fayette County, WVWV38,165-2,323+523%

3020▼331Erie County, OHOH73,296-2,326−184%

3021▼2,456Sonoma County, CACA486,444-2,419−103%

3022▲88Butte County, CACA209,211-2,421−112%

3023▲93Saginaw County, MIMI187,688-2,436+28%

3024▼2,890Jefferson County, COCO580,451-2,459−103%

3025▼1,735Tuolumne County, CACA53,160-2,460−141%

3026▼486Clearfield County, PAPA78,100-2,462−147%

3027▼2,598Monroe County, FLFL80,406-2,468−258%

3028▲64Columbiana County, OHOH99,377-2,500−166%

3029▲15Lawrence County, OHOH55,710-2,530−622%

3030▼52Hertford County, NCNC19,015-2,537−3353%

3031▼2,294Newport County, RIRI83,051-2,592+47%

3032▼23St. John the Baptist Parish, LALA39,875-2,602−185%

3033▼2,026Reeves County, TXTX12,138-2,610−4%

3034▼435Christian County, KYKY70,115-2,633−179%

3035▲46Scioto County, OHOH71,365-2,643+133%

3036▼1Leflore County, MSMS25,686-2,653−538%

3037▲65Lauderdale County, MSMS70,317-2,667−202%

3038▼57Bolivar County, MSMS28,262-2,723+119%

3039▼32Madison County, ILIL263,110-2,749−128%

3040▲53Mercer County, PAPA107,860-2,792+293%

3041▼82Rock Island County, ILIL141,869-2,803−531%

3042▲6Raleigh County, WVWV71,775-2,816−217%

3043▲31St. Mary Parish, LALA46,552-2,854−38%

3044▲44Mississippi County, ARAR37,828-2,857−48%

3045▲58Vermilion County, ILIL71,259-2,929−32%

3046▼235Broome County, NYNY195,736-2,947−75%

3047▼8Warren County, MSMS41,759-2,963−268%

3048▲61Trumbull County, OHOH198,972-3,005+11%

3049▼41St. Lawrence County, NYNY105,488-3,017+6916%

3050▼2,503Newport News, VAVA183,230-3,017−130%

3051▼1,004Montgomery County, ALAL225,891-3,063−121%

3052▼39Sunflower County, MSMS22,893-3,078−305%

3053▼61Iberia Parish, LALA66,846-3,083−162%

3054▼2,215Mobile County, ALAL411,658-3,151−115%

3055▼232Cabell County, WVWV91,183-3,167+7265%

3056▲56Dougherty County, GAGA82,616-3,174+1190%

3057▲3Peoria County, ILIL178,553-3,277−641%

3058▼11Blair County, PAPA119,541-3,281+135%

3059▲18Dallas County, ALAL35,140-3,322+88%

3060▼2,420Mendocino County, CACA88,122-3,479−159%

3061▲40Chautauqua County, NYNY124,126-3,531+65%

3062▼45Vernon Parish, LALA45,091-3,659−61%

3063▼2Chemung County, NYNY80,415-3,733−10%

3064▼36Niagara County, NYNY208,912-3,754+313%

3065▼417Yazoo County, MSMS22,947-3,796−244%

3066▲53Mahoning County, OHOH224,706-3,908−46%

3067▲29Pike County, KYKY54,721-3,948+3%

3068▼148Potter County, TXTX114,453-4,072−126%

3069▼846Anchorage, AKAK287,155-4,092−112%

3070▼344Rapides Parish, LALA125,877-4,146−21%

3071▼2,648Maui County, HIHI160,592-4,162−115%

3072▲45Jefferson County, ARAR62,987-4,273+253%

3073▼1,374Howard County, TXTX30,504-4,356−439%

3074▲21Washington County, MSMS40,446-4,476−10%

3075▲43Cambria County, PAPA128,968-4,504−57%

3076▼218Lassen County, CACA28,117-4,613−174%

3077▲20Macon County, ILIL99,300-4,698+88%

3078▼2,756Muscogee County, GAGA202,171-4,751−168%

3079▼2,159McKinley County, NMNM68,119-4,783−134%

3080▼2,242Humboldt County, CACA131,647-4,816−165%

3081▲32Erie County, PAPA265,832-5,044−196%

3082▼2,190Napa County, CACA132,949-5,070−138%

3083▲46Genesee County, MIMI401,093-5,118−190%

3084▼1,937Jefferson County, NYNY111,540-5,181−752%

3085▼2,829Monterey County, CACA433,729-5,306−112%

3086▲34Westmoreland County, PAPA349,324-5,339+1528%

3087▼209Terrebonne Parish, LALA104,163-5,417−172%

3088▼139Oneida County, NYNY226,392-5,733−63%

3089▼2,815Virginia Beach, VAVA453,737-5,733−118%

3090▲16Fayette County, PAPA123,021-5,783−276%

3091▼3,014Suffolk County, MAMA791,891-6,045−123%

3092▼2,841Santa Barbara County, CACA442,065-6,164−121%

3093▲30St. Clair County, ILIL250,708-6,692−1%

3094▼2,963Baltimore County, MDMD847,650-6,885−111%

3095▼30Norfolk, VAVA231,013-6,992−74%

3096▼2,915Erie County, NYNY946,741-7,495−59%

3097▲24Lucas County, OHOH423,347-7,932+9%

3098▼2,843Calcasieu Parish, LALA208,466-8,319−154%

3099▲23Kanawha County, WVWV172,381-8,364+11%

3100▼2,676Marin County, CACA253,694-8,627−150%

3101▼2,742Bernalillo County, NMNM667,601-8,843−112%

3102▼2,757Monroe County, NYNY750,506-8,937−142%

3103▼2,771Jefferson County, ALAL665,742-8,979−185%

3104▼2,624Jefferson Parish, LALA431,398-9,383−231%

3105▼2,666Onondaga County, NYNY466,584-9,932−7%

3106▼2,955Pinellas County, FLFL948,563-10,544−115%

3107▼2,961Ramsey County, MNMN541,623-10,729−142%

3108▼2,640Santa Cruz County, CACA258,852-12,009−146%

3109▼2,825Ventura County, CACA830,851-12,992−115%

3110▼2,553St. Louis County, MOMO990,911-13,214−158%

3111▲14Caddo Parish, LALA224,226-13,622−449%

3112▼5Milwaukee County, WIWI924,216-15,273−20%

3113▲18Baltimore, MDMD569,997-15,711−81%

3114▲12Hinds County, MSMS211,888-15,854+335%

3115▼3,097San Diego County, CACA3,282,248-16,386−105%

3116▼2,315Shelby County, TNTN910,226-19,518−127%

3117▼3,051Multnomah County, OROR795,391-20,037−126%

3118▼2,977San Mateo County, CACA743,568-20,874−136%

3119▼2,957Orleans Parish, LALA362,154-21,843+78%

3120▼3,089Santa Clara County, CACA1,914,391-21,868−112%

3121▲7St. Louis, MOMO278,144-23,434−52%

3122▲8Wayne County, MIMI1,769,038-24,523−51%

3123▼2,889Allegheny County, PAPA1,225,035-25,543−53%

3124▼3,025Honolulu County, HIHI988,703-27,805−170%

3125▼3,078New York County, NYNY1,664,862-29,389−159%

3126▼3,053Philadelphia County, PAPA1,574,281-29,516−57%

3127▼3Cuyahoga County, OHOH1,232,925-31,892+76%

3128▼3,105Orange County, CACA3,149,507-37,482−109%

3129▼3,104Alameda County, CACA1,636,630-45,723−128%

3130▼3,106Queens County, NYNY2,358,182-47,282−117%

3131▼3,043San Francisco County, CACA826,079-47,886−191%

3132▼3,074Bronx County, NYNY1,406,332-66,322−151%

3133▼3,069Cook County, ILIL5,194,625-80,916−130%

3134▼3,121Kings County, NYNY2,653,963-82,111−150%

3135▼3,114Los Angeles County, CACA9,694,934-319,075−149%

SHOWING 3,001–3,135 OF 3,135

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES