It sort of depends on how you define "North America".

Starting at the furthest North, there was Newfoundland, Canada, Nova Scotia (which then included New Brunswick), Prince Edward Island.

Then there were the 13 colonies which joined the revolution (Massachusetts, New Hampshire, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, North Carolina, South Carolina, Georgia).

Further south were East Florida and West Florida.

Then come a bunch of colonies which depend on the definition of "North America": Bermuda, The Bahamas, Antigua, Barbuda, Montserrat, St. Kitts, Nevis, (the previous 5 colonies, together with Anguilla and the British Virgin Islands, were sometimes governed more or less as one colony, "The Leeward Islands"), Dominica, St. Vincent, Grenada, Jamaica (which included the Cayman Islands). So, 7-11 colonies in the Atlantic and Caribbean.

(St. Lucia, Trinidad and Tobago, and Belize later became British colonies, but were not yet in 1775.)

26-30 British colonies in North America at the time of the American Revolution.