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 614 serves the Columbus metropolitan area in central Ohio including the larger cities and communities of Dublin, Gahanna, Grove City, Hilliard, Reynoldsburg, Upper Arlington, and Westerville in addition to many smaller communities within the area code 614 service area.rea code 380 has been approved by the Public Utilities Commission of Ohio as an overlay of area code 614 with an implementation date of February 27, 2016.