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.
Area codes 678 and 470 are North American Numbering Plan area codes assigned to metropolitan Atlanta, Georgia.They serve as overlays for the 404 and 770 area codes, which serve Atlanta itself and the suburbs respectively.rea codes 678 and 470 are North American Numbering Plan area codes assigned to metropolitan Atlanta, Georgia. They serve as overlays for the 404 and 770 area codes, which serve Atlanta itself and the suburbs respectively.