| Oliveira Noel | 5509 Doctor's Dr - Edinburg Telephone: |
| Omnicare Pharmacy Services | 101 E. Expwy. 83 Ste. D - Pharr Telephone: (956) 702-4601 |
| Oorjitham Edward | 1205 N Ed Carey Dr #2C - Harlingen Telephone: 956-440-8020 |
| Optimum Pain & Regenerative Medicine | 2121 Pease Street - Harlingen Telephone: 956) 350-0900 |
| Optimum Therapy | 5303 N McColl Rd - McAllen Telephone: 956-664-9955 |
| Oscar Sotelo | 6900 N. 10th St. #4 - McAllen Telephone: (956) 682-1591 |
| Our Sacred Heart Home Health | 1005 E 10th St - Weslaco Telephone: 956-969-8100 |
| Owens & Minor Inc | 1805 TX-499 Loop, - Harlingen Telephone: 956-428-6401 |
| Pable R. Pena | 1204 E. Hooks Ave. - Donna Telephone: (956) 464-4514 |
| Pablo Tagle Jr. | 2215 Fern Ave. - McAllen Telephone: (956) 686-2813 |