What is 603 area code?

The 603 area code is used in the state of New Hampshire in the United States. It was one of the original area codes established in 1947. The area code covers the entire state of New Hampshire and is currently the only area code serving the state.

Some cities and towns within the 603 area code include Manchester, Nashua, Concord, Portsmouth, and Dover. The 603 area code is in the Eastern Time Zone.

As of now, the 603 area code is not projected to be exhausted, so there are no plans for any changes or overlays. It is expected to continue serving New Hampshire for the foreseeable future.