Population Change
Approximately 96% of Florida’s 67 counties grew (and only three counties lost population) from 2022 to 2023. Other states, where a large majority of counties grew, included Idaho, where 95.5% or 42 of its 44 counties gained residents, and Tennessee, where 94.7% or 90 of its 95 counties gained residents.
Fastest Growing
Among counties with a population of 20,000 or more, the 10 fastest-growing were in the South—six in Texas (Kaufman, 7.6%; Rockwall, 6.5%; Liberty, 5.7%; Chambers, 5.0%; Comal, 5.0%; Ellis, 4.9%); two in Georgia (Jackson, 5.5%; Dawson, 5.1%); and one each in South Carolina (Jasper, 4.9%) and Virginia (New Kent, 4.7%).
Fastest Declining
Of the counties with populations above 20,000, Lassen County, California, experienced the biggest (3.9%) decrease in 2023. Randolph County, Missouri, followed with a loss of 2.1%. Population in Bronx County, New York, continued to decline, dropping by 1.8% in 2023 after dropping 3.0% in 2022 and 2.5% in 2021.
Largest Gaining
Eight of the 10 counties that led the nation by numeric change in 2023 were in Texas. This included Harris County, which added 53,788 residents and was the largest-gaining county in the nation, followed by Collin County (36,364) and Montgomery County (31,800).
Maricopa County, Arizona, the largest-gaining county in the nation in 2022, dropped to fourth in 2023 with a gain of just over 30,000 residents. Polk County, Florida, ranked fifth after adding 29,948 residents.
The remaining top five population gainers were all in Texas: Denton (29,943); Fort Bend (27,859); Bexar (27,488); Tarrant (27,301); and Williamson (24,918). Denton County gained nearly 30,000 new residents, pushing its population to just over 1 million and making it the seventh Texas county to reach this milestone.
Largest Declining
Los Angeles County, California, had the highest numeric population decline of 56,420 in 2023, compared to a loss of 89,697 people in 2022. Both drops stemmed from negative domestic migration. Kings, Queens, and Bronx counties in New York followed with population losses of 28,306; 26,362; and 25,332, respectively.
Among other large declines were Cook County, Illinois, which lost 24,494 people; Philadelphia County, Pennsylvania (-16,294); and Orange County, California (-14,617).
Refer to the bottom of the release for tables highlighting the top 10 most populous counties and top 10 counties for numeric growth and decline, as well as the fastest growing and declining.
