Trends in Percentages of the US Population Covered by State-Issued COVID-19 Nonpharmaceutical Interventions, March 1, 2020-August 15, 2021.

Trends in the percentages of the US population covered by state-issued nonpharmaceutical interventions (NPIs), including restaurant and bar restrictions, stay-at-home orders, gathering limits, and mask mandates, were examined by using county-specific data sets on state-issued orders for NPIs from March 1, 2020, to August 15, 2021. Most of the population was covered by multiple NPIs early in the pandemic. Most state-issued orders were lifted or relaxed as COVID-19 cases decreased during summer 2020. Few states reimplemented strict NPIs during later surges in US COVID-19 cases over the winter of 2020-2021. The exceptions were mask mandates, which covered about 80% of the population between August 2020 and February 2021, and the most restrictive gathering limits, which covered a maximum of 66% of the population in early 2020 and 68% of the population in winter 2020-2021. Most NPIs were lifted by the end of the analysis period.