List of quadrant routes in Adams County, Pennsylvania

State routes in Pennsylvania are maintained by the Pennsylvania Department of Transportation. This article lists all the routes (except signed traffic routes) and their termini in Adams County. As is the case with the other counties in the state, quadrant route numbers start in the northeast quadrant and go clockwise from the 1000s to the 4000s. Odd numbered roads travel south to north, with numbering starting in the north and east of the quadrant. Even numbered roads travel west to east, with numbering also starting in the north and east.

The quadrant dividers are not explicitly delineated.

Prior to 1987, legislative route (LR) numbers were used instead.