Some online users have reported receiving phone scam calls from 626 area code telephone numbers, where the callers impersonate IRS agents and request money. If you have calls from area code 626, please share experiences with us by leaving a comment below. Area code 626 is an overlay of 714 that became effective on September 23, 2008. It encompasses northern Orange County, a portion of Los Angeles County, and the Sleepy Hollow and Carbon Canyon areas of Chino Hills in San Bernardino County.