San Francisco got 628 about four years ago and it's slowly crept into use.The 346 area code went into operation in 2014, so not really new. Houston is a rare example of four overlay area codes (713/281/832/346).
We might be getting a fifth area code in the next two or three years: Sorry, 713 Day: Houston's growth will lead to new area code
Of course the outer reaches of Houston metro also have 409, 936 and 979.
Denver now has 983 but I never see it anywhere - still everything is 303 or 720.
With cellphones and no real concept of "long distance" any more, every phone number is effectively a 10-digit number. Most radio call-in shows have toll-free numbers now, too. It's a long ways from the days when KMOX in St. Louis would tell the suburbs (including the one where I went to high school) to "dial the operator and ask for Enterprise 9808".