| Business | Phone |
| Li Wan Po, A K Md 4239 Petrolia, Petrolia N0N 1R0 | (519) 882-0190 |
| Hodgetts, S D Md 431 King St, Petrolia N0N 1R0 | (519) 882-2620 |
| Mac Donald, W A C Md 360 Centre St, Petrolia N0N 1R0 | (519) 882-0140 |
| Mather, Susan Md 3958 Petrolia Line, Petrolia N0N 1R0 | (519) 882-1678 |
| Petrolia Family Medical Ctr 450 Blanche, Petrolia N0N 1R0 | (519) 882-2500 |
| Riedl, Frank W Md 411 Wingfield Ave, Petrolia N0N 1R0 | (519) 882-2110 |