Iglesia San Patricio (Calle Espíritu Santo, Loíza, 787/876-2229, Mon.–Fri. 8 a.m.–4 p.m.) is claimed to be Puerto Rico [1]’s oldest church in continuous use, founded in 1670. It is also known as Espíritu Santo.
Links:
[1] http://www.moon.com/destinations/puerto-rico