Some of the cities, towns, and places in Dauphin County are Bachmanville, Beaufort Farms, Berrysburg, Bressler, Carsonville, Chambers Hill, Clifton, Colonial Park, Conewago, county seat, Dauphin, Dayton, Deodate, Derry, Dietrich, East Hanover, Ebenezer, Edgemont, Elizabethville, Ellendale Forge, Enders, Enhaut, Enterline, Estherton, Fort Hunter, Freys Grove, Grantville, Gratz, Greenfield, Halifax, Hanoverdale, Harrisburg, Heckton, Hershey, Highspire, Hockersville, Hoernerstown, Hummelstown, Inglenook, Jackson, Jednota, Jefferson, Killinger, Lawnton, Lenkerville, Linglestown, Londonderry, Lower Paxton, Lower Swatara, Lykens, Malta, Manada Gap, Manada Hill, Matamoras, Matterstown, Middle Paxton, Middletown, Mifflin, Millersburg, Montrose Park, Oakleigh, Oakmont, Oberlin, Oberlin Gardens, Palmdale, Paxtang, Paxtang Manor, Paxtonia, Penbrook, Piketown, Pillow, Powells Valley, Progress, Reed, Ritzie Village, Rockville, Royalton, Rush, Rutherford, Sand Beach, Shellsville, Singersville, Skyline View, South Hanover, Speeceville, Steelton, Susquehanna, Swatara, Union Deposit, Upper Paxton, Vaughn, Washington, Wayne, Waynesville, West Hanover, Wiconisco, Williams, Williamstown, Windsor Farms
Dauphin County is a county in the U.S. state of Pennsylvania. As of the 2010 census, the population was 268,100. The county seat and the largest city is Harrisburg, Pennsylvania's state capital and ninth largest city. The county was created ("erected") on March 4, 1785, from part of Lancaster County and was named after Louis-Joseph, Dauphin of France, the first son of king Louis XVI.
Dauphin County is included in the Harrisburg–Carlisle Metropolitan Statistical Area.
Located within the county is Three Mile Island Nuclear Generating Station, site of the 1979 nuclear core meltdown. The nuclear power plant closed in 2019.