| Business | Phone |
| Alliance Church 832 S Virginia Ave, Mercedes 78570 | (956) 565-4497 |
| Christian & Missionary 844 S Virginia Ave, Mercedes 78570 | (956) 565-1579 |
| Church-Jesus Christ-Lds 321 S Virginia Ave, Mercedes 78570 | (956) 514-2438 |
| El Buen Pastor United Meth Ch 341 S Virginia Ave, Mercedes 78570 | (956) 565-1169 |
| El Principe De Paz Prsbytrn 1340 S Georgia Ave, Mercedes 78570 | (956) 565-1668 |
| First Baptist Church 508 S Missouri Ave, Mercedes 78570 | (956) 565-2248 |
| First Mexican Baptist Church 309 N Texas Ave, Mercedes 78570 | (956) 565-3586 |
| First Presbyterian Church 601 S Texas St, Mercedes 78570 | (956) 565-4615 |
| First Untd Mthdst Chr Mercedes 200 W 16th St, Mercedes 78570 | (956) 565-1301 |
| Iglesia Bautista Filadelfia 410 Dawson Rd, Mercedes 78570 | (956) 565-3611 |
| Iglesia De Cristo 144 N Texas Ave, Mercedes 78570 | (956) 514-1858 |
| Iglesia Evangelica Inc Templo 3313 Mile 10 N, Mercedes 78570 | (956) 514-5011 |
| Iglesiadel Nazareno 648 S Indiana Ave, Mercedes 78570 | (956) 565-0488 |
| Immanuel Lutheran Church 703 W 3rd St, Mercedes 78570 | (956) 565-1518 |
| Jehovah's Witnesses 1501 Rio Rico Rd, Mercedes 78570 | (956) 514-1512 |
| Jehovah's Witnesses W Expressway 83, Mercedes 78570 | (956) 565-4134 |
| Mercedes Christian Church 612 S Texas St, Mercedes 78570 | (956) 565-1509 |
| Mision Luterana Emanuel 257 S Washington Ave, Mercedes 78570 | (956) 565-4678 |
| Our Lady Of Mercy 322 S Vermont Ave, Mercedes 78570 | (956) 565-1141 |
| Presbyterian Church 1332 S Georgia Ave, Mercedes 78570 | (956) 565-9793 |
| Sacred Heart Church 920 Anaquitas St, Mercedes 78570 | (956) 565-0271 |
| Sacred Heart Catholic Church 600 N Washington Ave, Mercedes 78570 | (956) 565-7746 |