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 code 610 is a Pennsylvania area code that covers the surrounding areas of Philadelphia.Area code 610 overlays the area code of 484. Pennsylvania has area codes of 215, 267, 272, 412, 484, 570, 610, 717, 724, 814, 878.The following map shows the coverage of 610 area code. The coverage area is shown in green.Area code map of the entire U.S. The USA.com website and domain are privately owned and are not operated by or affiliated with any government or municipal authority.ennsylvania has area codes of 215, 267, 272, 412, 484, 570, 610, 717, 724, 814, 878. The following map shows the coverage of 610 area code. The coverage area is shown in green.