Perhaps strange because I don’t see ‘the first church of Calvinism’ in any town, one does find Methodist and other churches that grew out of Calvinism. But never hear much mention of Calvin, or Swingel, others from the 15th & 16th Century, except for Henry VIII.
Calvinism isn’t a denomination, nor is it limited to the Orthodox Presbyterians (but don’t confuse us for the PCUSA). You will find Calvinists heavily amongst the Baptists, for example, such as Dr. John Piper.