Ontario has 5 ZIP Codes covering 72.71 square miles. Area includes Montclair and Ontario regions. Located in San Bernardino County. Served by 3 area codes: 909, 840, 951
Portland has 60 ZIP Codes covering 274.43 square miles of land. Area includes Clackamas, Portland, Maywood Park, and other 20 towns. Portland is part of Portland-Vancouver-Hillsboro CBSA with code 38900