What type of church is it? Presbyterian? Methodist? UCC? Catholic?
Do they have more than one?
The obvious place to look is the census, but I've had trouble tracking one down. (I've found an online copy of the raw data behind the 1901 census, but that's going to be an awful lot of work to analyze for this sort of thing. Beyond that, the closest I've gotten is 1981, which isn't much help.) I can't think where else to refer to for this sort of information.