Where in North America is area code 268?

Area code 268 is the Caribbean island country of Antigua and Barbuda.

Calls to Antigua and Barbuda from the USA, Canada, and other parts of North America's telephone country code +1, are dialed "one plus," the same as domestic long distance calls, although international toll rates will apply.

(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)