For the wine region, see Napa Valley AVA. Napa County is a county located north of San Pablo Bay in the northern portion of the U.S. state of California. As of the 2010 census, the population was 136,484. The county seat is the City of Napa. Napa County was one of the original counties of California, created in 1850 at the time of statehood.
Area code 412 is a Pennsylvania area code that covers Pittsburgh and some of the surrounding areas. Area code 412 overlays the area code of 878. Pennsylvania has area codes of 215, 267, 272, 412, 484, 570, 610, 717, 724, 814, 878.
814 is one of the original area codes established in 1947, and is the largest in Pennsylvania in terms of area.It is the only one of Pennsylvania's original four area codes, and one of the few original area codes not covering an entire state, that has never been split or overlaid.14 is one of the original area codes established in 1947, and is the largest in Pennsylvania in terms of area.