One of several Catholic Church's in Harlingen, is the quaint Our Lady of the Assumption Catholic Church at 1313 W Buchanan St, Harlingen, TX 78550.
Sunday mass is 8, 10, Noon and 6. They have a "Valley" population so there is both English and Spanish speaking congregation and visitors. You are warmly greeted here as a visitor and I liked that a lot. The church seating is half-round style and comfortable.