| Business | Phone |
| Building Inspector 444 Sw 4th St, Ontario 97914 | (541) 881-3220 |
| City Engineering 458 Sw 3rd St, Ontario 97914 | (541) 881-3240 |
| Ontario Aquatic Center 790 Sw 3rd Ave, Ontario 97914 | (541) 889-7946 |
| Ontario Cemetery 1125 S Park Blvd, Ontario 97914 | (541) 889-8574 |
| Ontario City Adm Ontario 97914 | (541) 881-3232 |
| Ontario City Secretary 444 Sw 4th St, Ontario 97914 | (541) 881-3224 |
| Ontario Engineering Div 444 Sw 4th St, Ontario 97914 | (541) 881-3236 |
| Ontario Planning Dept 458 Sw 3rd St, Ontario 97914 | (541) 881-3222 |
| Ontario Street Maintenance 55 Ne 2nd Ave, Ontario 97914 | (541) 889-8572 |