Old Greenwich, Connecticut Area Code

Old Greenwich, CT Area Codes are

203 and 475

Old Greenwich, CT is officially utilizing an area code overlay in which area codes 203 and 475 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.

In addition to Old Greenwich, CT area code information read more about area codes 203 and 475 details and Connecticut area codes.

Old Greenwich, CT is located in Fairfield County and observes the Eastern Time Zone. View our Times by Area Code tool.