Area code 727 covers Pinellas county, including St. Petersburg, Clearwater, Pinellas Park, excluding Oldsmar and the western third of Pasco, including New Port Richey, Port Richey, and Holiday. For 43 years the 13 counties around Tampa Bay, including all exurbs like Srasota, Ellenton and Port Charlotte were 813. In 1998, Pinellas and western part of Pasco County were split into area code 727. Areas south of Hillsborough became 941.
Oldsmar
When area code 813 was being split into the three area codes 813, 727, and 941, Oldsmar, being right on the county line between Pinellas and Hillsborough, was wired into the Tampa trunk, rather than Pinellas (nothing really existed between Clearwater and Oldsmar). The cost was prohibitive to rewire Oldsmar to tie it into Pinellas' trunk, so Oldsmar has the distinction of being the only location in Pinellas county that is 813.
The 941 areacode is created on March 3, 1996, from a split of 13 counties in Southwest Florida from the 813 areacode.
The 561 areacode is created on April 13, 1997, as Indian River, St. Lucie, Martin and Palm Beach counties are split from the 407 areacode, leaving just Seminole, Orange, Osceola and Brevard counties in the 407 areacode.
The 850 areacode is created on March 23, 1998, when the 904 areacode split so that 18 counties in the Florida Panhandle are in the new 850 areacode.
Those gadgets, with all their phone numbers, are eating away at the region's pool of areacodes.
And the 352 areacode, covering northeastern Pasco and nine counties including Citrus and Hernando, will be exhausted by 2006, according to the numbering administration.
The areacode problem is nationwide, but there still are 14 states with only one areacode.