- Notes on Early New Testament Manuscripts
- Notes on Population in Second Temple Judaism and Early Christianity
From Encountering the Manuscripts: An Introduction to New Testament Paleography & New Testament by Philip W. Comfort (see Annotated Bibliography on New Testament Text and Canon).
By the end of the second century, there was a church in almost every major city [in the Greco-Roman world]. [Kindle location 1353]
There were, of course, other churches in villages and the countryside. But these city churches totaled forty-three in the first century and another fifty-four in the second. Roughly, one hundred local churches were in existence by the year 200. [Kindle location 1369]
From Destroyer of the Gods: Early Christian Distinctiveness in the Roman World by Larry W. Hurtado, Baylor University Press, 2016, page 3. In his footnote, Hurtado cites as his source Keith Hopkins in “Christian Number and Its Implications (Journal of Early Christian Studies, 1998) for this information. He also cites two additional sources for this kind of information.
One recent estimate of the number of sites where there were bodies or “communities” of Christians posits a hundred or so (many of these comprising several house-based groups) by 100 AD and two hundred to four hundred sites by 200 AD.