This is a link to the Dauphin County GIS Data Portal.
The following categories are available:
Boundaries
Election
Hydrology
Tax Assessment
Transportation
Elevation

The following Applications are available:
Mobile Parcel Viewer - provides the general public and other interested parties access to searchable and interactive information such as property tax and assessment information or the locations of water access points.

MDJ (Magisterial District Judges) Locator - Identifies Magisterial District Judge and Municipality

Dauphin County Homicides - Application showing Dauphin County homicides in 2015 and 2016

Parcel Viewer - Search for a Parcel, Property Information, Tax Assessment, Municipality, Assessed Land or Building Value, Acres, etc.

Digital Data is distributed as a countywide dataset in ESRI shapefile format. Aerial imagery is available as a countywide dataset either through Dauphin County GIS or downloaded from PA Spatial Data Access (PASDA also available on the Commonwealth Open Data portal)