UPDATE: View our newer map with more recent 2012 data.
Many counties have seen sizable swings in population since the 2010 Census.
Estimated changes in population, shown in the map below, occurred from April 2010 to July 2011. For some counties, recent poulation trends were much different than shifts experienced during the prior decade.
Much of the counties reporting the largest gains are in the southern and western regions of the U.S.
Harris County, Texas, gained an estimated 88,452 residents – the largest raw increase of any county. The county’s birth rate more than tripled its death rate, according to census data. Los Angeles County, Calif., added 70,451 residents – second only to Harris County.
The map below shows the fastest growing counties by percent change. Select and drag to pan the map or click a county to view detailed data.
|< -1%||-0.1 to -1%||No Change||< +1%||+1 to 3%||> +3%|
|County||2011 Estimate||2010-2011 Change||Percent change|
|Harris County, Texas||4,180,894||88,452||2.2|
|Los Angeles County, California||9,889,056||70,451||0.7|
|Maricopa County, Arizona||3,880,244||63,127||1.7|
|Miami-Dade County, Florida||2,554,766||58,331||2.3|
|Riverside County, California||2,239,620||49,979||2.3|
|Dallas County, Texas||2,416,014||47,875||2.0|
|Orange County, California||3,055,745||45,513||1.5|
|San Diego County, California||3,140,069||44,756||1.4|
|Bexar County, Texas||1,756,153||41,376||2.4|
|Tarrant County, Texas||1,849,815||40,776||2.3|
|Travis County, Texas||1,063,130||38,858||3.8|
|Hillsborough County, Florida||1,267,775||38,549||3.1|
|King County, Washington||1,969,722||38,473||2.0|
|Broward County, Florida||1,780,172||32,106||1.8|
|San Bernardino County, California||2,065,377||30,167||1.5|
|Collin County, Texas||812,226||29,885||3.8|
|Fulton County, Georgia||949,599||29,016||3.2|
|Wake County, North Carolina||929,780||28,787||3.2|
|Kings County, New York||2,532,645||27,945||1.1|
|Santa Clara County, California||1,809,378||27,736||1.6|
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New Census estimates suggest that many larger cities continue to see populations climb, including some that could be experiencing their first growth in years. View data for each city.