As genealogists researching American ancestors, one record set we focus on is census records. Now we tend to think of this mostly in terms of the U.S. Federal Census but most genealogists are also aware there are state and territorial census records as well.
But the government wasn't the only entity counting its population, some religious groups have also taken a census. One example is this counting of Quakers in 1828, available from the Family History Library on microfilm.
Quaker Census of 1828: Members of the New York Meeting, the Religious Society of Friends (in New York, Ontario, Vermont, Connecticut, Massachusetts, and Quebec) at the time of the seperation in 1828.