Denison, TX utilizes an area code overlay in which area codes 903 and 430 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.
In addition to Denison, TX area code information view area codes 903 and 430 details and Texas area codes.
Denison, TX is located in Grayson County and observes the Central Time Zone.
View our Times by Area Code tool.