* Data is updated decenially in conjunction with the decennial U.S. Census.
Figures are sums of individual group responses to the Religion Census. Use great caution in comparing 2010 to prior years of this census, particularly for non-Christian groups. Groups vary widely with their definitions of congregations and members; adherents and adherent rate are the most comparable across groups. However, black Protestant Christian churches are known to be undercounted; see URL for details. Data used with permission of the Association of Statisticians of American Religious Bodies.
Years Available: 1980, 1990, 2000, 2010
Permanent Link: http://data.sagepub.com/sagestats/4302
General Notes: *Median value gives the value for the "average" county for this metric, the 50th percentile of all counties reporting data. **Members are determined by the by-laws of each participating group. Members in Christian Protestant denominations are most often referred to as "full" or "communicant" members.