bookslover
Puritan Board Doctor
Here is a map of the USA showing all practicing EP congregations throughout. https://www.google.com/maps/d/viewer?dg=feature&msa=0&mid=1q4ric5QVXOK8gvBEM-VnAiRjex0&ll=39.10027307175783,-97.21224968750005&z=4
Interesting: they seem to be clustered mostly in New England (the "burned-over district") and the Mid-West.