Fastest Growing Counties in America 2010-2020 | America's Fastest Growing Counties, Fastest Growing Counties in US, Counties Growing Fastest

Fastest Growing Counties in America 2010-2020

April 2022

**Main Street in Watford City, ND, the seat of McKenzie County**

The 2 fastest growing counties in the U.S. are small, rural counties in North Dakota whose oil boom continues to attract workers from all over the world. Long sustained by wheat and cattle, McKenzie County is now the top oil-producing county in the nation, helping to more than double the county's population and boost its median household income over 60% since 2010.

Over half of the 20 fastest growing counties since the 2010 census are in Texas and Florida. The Orlando area was Florida's fastest growing region, which has been particularly appealing to retirees. For example, Central Florida's largest retirement community of The Villages, which sprawls across Sumter, Lake and Marion counties, grew by 39% alone. In Texas, the highest growth has been in the region between Austin and San Antonio, which attracted people in search of lower taxes and high paying jobs at Austin's big tech companies like Tesla, Amazon and Oracle, and in San Antonio's growing petroleum sector.

	County	2020 Population	2010 Population	% Increase	Metro Area
1.	McKenzie County, ND	14,704	6,360	131.2%	n/a
2.	Williams County, ND	40,950	22,398	82.8%	Williston
3.	Hays County, TX	241,067	157,107	53.4%	Austin
4.	Dallas County, IA	99,678	66,135	50.7%	Des Moines
5.	Bryan County, GA	44,738	30,233	50%	Savannah
6.	Comal County, TX	161,501	108,472	49%	San Antonio
7.	Wasatch County, UT	34,788	23,530	47.8%	Salt Lake City
8.	Osceola County, FL	268,685	388,656	44.7%	Orlando
9.	Williamson County, TX	609,017	422,679	44.1%	Austin
10.	St. Johns County, FL	273,425	190,039	43.9%	Jacksonville
11.	Forsyth County, GA	251,283	175,511	43.2%	Atlanta
12.	Kaufman County, TX	145,310	103,350	40.6%	Dallas-Ft. Worth
13.	Ft. Bend County, TX	822,779	585,375	40.6%	Houston
14.	Stark County, ND	33,646	24,199	39%	Dickinson
15.	Sumter County, FL	129,752	107,819	38.9%	Orlando
16.	Rockwall County, TX	107,819	78,337	37.6%	Dallas-Ft.Worth
17.	Walton County, FL	75,305	55,043	36.8%	Ft. Walton/Destin
18.	Williamson County, TN	247,726	183,182	35.2%	Nashville
19.	Loudoun County, VA	420,959	312,311	34.8%	Washington, DC
20.	Kendall County, TX	44,279	33,410	32.5%	San Antonio
	National Average	331,449,281	308,745,538	7.4%

Population figures represent the 2020 and 2010 US Census Bureau results.