303 Area Code

Area code 303 serves the entire state of Colorado in United State, providing phone services to both residential and business users. It covers urban, suburban, and rural areas alike, ensuring reliable communication across the region.

Area code 303 is located in the Mountain Standard Time (MST) time zone. This designation indicates the predominant time zone for calls made within this area code.

Area code 303 was officially assigned on 01-JAN-47, signifying its designation for use in telecommunications, and it became operational on 01-JAN-47, allowing callers to begin using this area code for their dialing needs.

Yes, the 302 area code is still active and in service. It is the primary area code for all landline and mobile phones registered in Delaware. There are no overlay codes currently in place for the state.

For local calls within area code 303, the required dialing pattern is 10D. For toll calls, you'll need to dial 1+10D , where "D" indicates the number of digits to dial. When calling foreign NPAs from area code 303, local calls require 10D, and toll calls use 1+10D.