The 2020 PRRI Census of American Religion provides unprecedented county-level data on religious identity and diversity in the United States. Based on interviews with more than 500,000 respondents between 2013 and 2020, the census report reveals the shifting dynamics of American religious affiliation across geography, race and ethnicity, age, and political affiliation over the last decade. It provides the most detailed estimates of American religious affiliation since the U.S. Census Bureau last collected religious data in 1957.