Bay St. Louis
Below are utility companies that service the Bay St. Louis area.
| Power | Phone | Television | Internet | Water |
| Mississippi Power 300 Highway 90 Bay St. Louis, MS 39520 800-532-1502 |
AT&T
800-288-2020 |
AT&T 800-288-2020 |
AT&T 866-861-6075 |
City of Bay St. Louis P.O. Box 2759 Bay St. Louis, MS 39520 228-467-6208 |
| Coast Electric 1005 U.S. Highway 90 P.O. Box 2430 Bay St. Louis, MS 39521-2430 877-769-2372 |