A regional area code is a telephone prefix for a region of a country, rather than a single city or town and its environs.
The airport code for Tallahassee Regional Airport is TLH.
The 610 area code is in Pennsylvania, more specifically the southeastern region, including Delaware and Philadelphia counties. It is in the same regional area as 484, 267, and 215.
The airport code for Reading Regional Airport is RDG.
The airport code for Watertown Regional Airport is ATY.
The airport code for Idaho Falls Regional Airport is IDA.
The airport code for Ha'il Regional Airport is HAS.
The airport code for Anderson Regional Airport is AND.
The airport code for Ozark Regional Airport is WMH.
The airport code for Wittman Regional Airport is OSH.
The airport code for Pratt Regional Airport is PTT.
The airport code for Marana Regional Airport is AVW.
The airport code for Kindersley Regional Airport is YKY.