Presented by Village Profile. Ontario is nestled on the lush banks of the Snake River and is proud to be the first Oregon city you encounter when traveling west from the Idaho border. Once you enter the uniquely rugged landscape of the Treasure Valley, you will come to understand why many people never want to leave. Those who choose to live here understand the meaning and importance of a quality, family-oriented lifestyle. Thus, the community reflects the energy, distinction and diversity of the surrounding geography.