Region's growth will soon exceed 615's capacity.

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Get ready for the 629.

Nashville and Middle Tennessee will add a second area code, state officials say, starting in about two years, when the 615 and its booming population are expected to run out of phone numbers.

The Tennessee Regulatory Authority announced Thursday that it had decided unanimously to create a 629 overlay to supplement the 615 area code, which has served the 13-county region centered on Nashville since 1954.

The agency said the decision reflected the results of a survey taken over the past two months, which found that 83 percent favored an overlay over splitting the 615 into two regions.

The overlay will let old phone customers keep their current numbers. But in addition to being a scarlet number for newcomers, it means all Middle Tennesseans will have to dial 10 digits every time they make a call, even in the 615 area code.

Those calls usually will not be considered long distance, however.

The TRA projects that the first 629 numbers will be issued in spring of 2015. Plenty of time to get dialing fingers in shape and cellphone directories up to date.