Through an article in the newsletter of the Presbyterian Historical Society, I've become aware of a newly-completed online resource that's part of the PHS website. It's called Hall's Index of American Presbyterian Congregations, and it's a respository of basic information about every Presbyterian church in the country that's ever existed, of the PC(USA) and its antecedent denominations, as well as the Cumberland Presbyterian Church.
The information there is pretty limited: mostly the name and location of the church, and the date of founding.
Still, you may be interested to go to the site and look up your church's listing.
It's mostly a tool for historical researchers, but is available to anyone.
The Presbyterian Historical Society is supported largely by per capita funds.