Reversal: Big Metro Counties Lose Population

Population growth in the United States ground to a halt during the pandemic. Between July 1, 2020, and June 30, 2021, the population grew by just 0.1 percent, according to Census Bureau estimates. This is the slowest rate of growth in the nation's history. 

The coronavirus pandemic explains the slow growth. Because of Covid, deaths exceeded births in a record high 73 percent of the nation's counties. Because of Covid, the number of net international migrants to the United States plunged, falling to just 247,000 in 2020–21, down from 477,000 in 2019–20. For context, net international migration was as high as 1,049,000 in 2015–16.

The pandemic also messed with domestic migration, consequently reversing the long-standing pattern of population growth by Rural-Urban Continuum. The Rural-Urban Continuum (RUC) is the federal government's system of classifying counties by their degree of urbanity. It is a useful tool for analyzing growth patterns at the county level. The RUC is a scale ranging from 1 (the most urban counties, in metropolitan areas of 1 million or more) to 9 (the most rural counties, lacking any settlements of 2,500 or more people and not adjacent to a metropolitan area).

The long-term pattern during the 2010s was one of urban growth—the more urban, the greater the growth. But this was not the case in 2020–21, according to a Demo Memo analysis. Counties with a rank of 1 on the continuum (the most urban) lost population during the year. Every other county type grew at least a bit, even the most rural. Here is how county populations changed in 2020–21 by rank on the Rural-Urban continuum...

County population change by Rural-Urban Continuum rank, July 1, 2020–June 30, 2021
1. -0.16% for counties in metros with 1 million or more people
2.  0.62% for counties in metros of 250,000 to 1 million people
3.  0.47% for counties in metros with less than 250,000 people
4.  0.36% for nonmetro counties with urban pop of 20,000-plus, adjacent to metro
5.  0.06% for nonmetro counties with urban pop of 20,000-plus, not adjacent to metro
6.  0.29% for nonmetro counties with urban pop of 2,500–19,999, adjacent to metro
7.  0.04% for nonmetro counties with urban pop of 2,500–19,999, not adjacent to metro 
8.  0.63% for nonmetro counties with urban pop less than 2,500, adjacent to metro 
9.  0.28% for nonmetro counties with urban pop less than 2,500, not adjacent to metro 

Behind the population loss in big metro counties is the one-two-three punch of the pandemic. Births fell, deaths increased, and the trickle of net international migrants could not make up for domestic migration losses in some of the largest metros such as New York, San Francisco, Los Angeles, and Chicago.

Source: USDA, Economic Research Service, Rural-Urban Continuum Codes and Census Bureau, County Population Totals: 2020–2021