Ontario, Oregon Area Code
Ontario, OR utilizes an area code overlay in which area codes 458 and 541 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.
In addition to Ontario, OR area code information read more about area codes 458 and 541 details and Oregon area codes.
Ontario, OR is located in Malheur County and observes the Mountain Time Zone. View our Times by Area Code tool.