Founded in 1785, Dauphin County is one of 67 counties in the state of Pennsylvania. Historically, Dauphin County was formed from parts of Lancaster County. The city of Harrisburg is the county seat. With FIPS code of 43, Dauphin County has a population of 287,400 and area of 558 square miles (1,445 km2).
List of all cities in Dauphin County, PA alphabetically
| City/Town | Postal Code | Area Code |
| Bachmanville, PA | 17033 | 717 |
| Berrysburg, PA | 17005 | 717 |
| Blue Cross, PA | 17177 | 717 |
| Blue Shield, PA | 17140 | 717 |
| Bressler, PA | 17113 | 717 |
| Brownstone, PA | 17036 | 717 |
| Bureau of Motor Vehicles, PA | 17122 | 717 |
| Capital Blue Cross, PA | 17177 | 717 |
| Carsonville, PA | 17032 | 717 |
| Dauphin, PA | 17018 | 717 |
| Department of Revenue, PA | 17127 | 717 |
| 17128 | 717 | |
| Derry Church, PA | 17033 | 717 |
| Elizabethville, PA | 17023 | 717 |
| Ellendale, PA | 17018 | 717 |
| Enders, PA | 17032 | 717 |
| Enterline, PA | 17032 | 717 |
| Erdman, PA | 17048 | 717 |
| Eville, PA | 17023 | 717 |
| Fisherville, PA | 17032 | 717 |
| Grantville, PA | 17028 | 717 |
| Gratz, PA | 17030 | 717 |
| Green Fields, PA | 17098 | 717 |
| Halifax, PA | 17032 | 717 |
| Harrisburg, PA | 17101 | 717 |
| 17102 | 717 | |
| 17103 | 717 | |
| 17104 | 717 | |
| 17105 | 717 | |
| 17106 | 717 | |
| 17107 | 717 | |
| 17108 | 717 | |
| 17109 | 717 | |
| 17110 | 717 | |
| 17111 | 717 | |
| 17112 | 717 | |
| 17113 | 717 | |
| 17120 | 717 | |
| 17121 | 717 | |
| 17122 | 717 | |
| 17123 | 717 | |
| 17124 | 717 | |
| 17125 | 717 | |
| 17126 | 717 | |
| 17127 | 717 | |
| 17128 | 717 | |
| 17129 | 717 | |
| 17130 | 717 | |
| 17140 | 717 | |
| 17177 | 717 | |
| HBG Inter Airp, PA | 17057 | 717 |
| Hershey, PA | 17033 | 717 |
| High Spire, PA | 17034 | 717 |
| Highspire, PA | 17034 | 717 |
| Hoernerstown, PA | 17036 | 717 |
| Hot I A, PA | 17057 | 717 |
| Hummelstown, PA | 17036 | 717 |
| Inglenook, PA | 17032 | 717 |
| Killinger, PA | 17061 | 717 |
| Lenkerville, PA | 17061 | 717 |
| Linglestown, PA | 17112 | 717 |
| Londonderry, PA | 17057 | 717 |
| Lower Paxton, PA | 17109 | 717 |
| 17112 | 717 | |
| Lower Swatara, PA | 17057 | 717 |
| Loyalton, PA | 17048 | 717 |
| Lykens, PA | 17048 | 717 |
| McClellan, PA | 17032 | 717 |
| Middle Paxton, PA | 17018 | 717 |
| Middletown, PA | 17057 | 717 |
| Millersburg, PA | 17061 | 717 |
| Oberlin, PA | 17113 | 717 |
| Pa Blue Shield, PA | 17140 | 717 |
| Palmdale, PA | 17033 | 717 |
| Paxtang, PA | 17111 | 717 |
| 17112 | 717 | |
| Penbrook, PA | 17103 | 717 |
| 17109 | 717 | |
| Pheaa, PA | 17130 | 717 |
| Pillow, PA | 17080 | 717 |
| Powells Valley, PA | 17032 | 717 |
| Reed, PA | 17032 | 717 |
| Rife, PA | 17061 | 717 |
| Royalton, PA | 17057 | 717 |
| Sandbeach, PA | 17033 | 717 |
| Shellsville, PA | 17028 | 717 |
| Shope Gardens, PA | 17057 | 717 |
| Singersville, PA | 17018 | 717 |
| South Hanover, PA | 17036 | 717 |
| South Londonderry, PA | 17033 | 717 |
| Specktown, PA | 17048 | 717 |
| State Dept of Education, PA | 17126 | 717 |
| State Employment Security, PA | 17121 | 717 |
| State General Services, PA | 17125 | 717 |
| State Liquor Control, PA | 17124 | 717 |
| State of Pennsylvania, PA | 17120 | 717 |
| Steelton, PA | 17113 | 717 |
| Stoverdale, PA | 17036 | 717 |
| Swatara, PA | 17111 | 717 |
| Swatara Station, PA | 17033 | 717 |
| Traffic Safety, PA | 17123 | 717 |
| Union Deposit, PA | 17033 | 717 |
| Upper Paxton, PA | 17061 | 717 |
| USPS Official, PA | 17107 | 717 |
| Waltonville, PA | 17036 | 717 |
| Water Gap, PA | 17018 | 717 |
| Waynesville, PA | 17032 | 717 |
| West End, PA | 17102 | 717 |
| Wiconisco, PA | 17097 | 717 |
| Williams, PA | 17098 | 717 |
| Williamstown, PA | 17098 | 717 |