Area code 773 was brought into effect on October 12, 1996. 773 was split from the parent 312 area code.
Counties in Area Code 773
Most Populous Cities in Area Code 773
|City||County||City Population||Time Zone|
Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.
View all United States Area Codes.