Where in North America is area code 469?

Area code +1 470 is an overlay on area codes 404, 770, and 678, serving the Atlanta metropolitan area in Georgia, USA.

(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.)