Granite Staters celebrate June 3 as “603 Day” or “New Hampshire Day,” in honor of the New Hampshire’s sole area code, 603, in the North American Numbering Plan (NANP). In October 1947, the area code 603 was one of the original 86 numbering plan areas.
“603 Day“ began being celebrated around 2010.
On “603 Day,” it’s easy for many NH residents to express their love for The State of NH because as a few natives have stated: