Pennsylvania Highways
State Highways


PA 1 - PA 50 PA 251 - PA 300 PA 501 - PA 550 PA 751 - PA 800
PA 51 - PA 100 PA 301 - PA 350 PA 551 - PA 600 PA 801 - PA 850
PA 101 - PA 150 PA 351 - PA 400 PA 601 - PA 650 PA 851 - PA 900
PA 151 - PA 200 PA 401 - PA 450 PA 651 - PA 700 PA 901 - PA 950
PA 201 - PA 250 PA 451 - PA 500 PA 701 - PA 750 PA 951 - PA 999

Click on the counties for their secondary highways
Westmoreland County Cameron County Somerset County Elk County Adams CountyMap of Pennsylvania

How the system works:
0001-0999 - Primary routes
1000-1999 - Northeast quadrant of county (non-traffic routes)1
2000-2999 - Southeast quadrant of county (non-traffic routes)1
3000-3999 - Southwest quadrant of county (non-traffic routes)1
4000-4999 - Northwest quadrant of county (non-traffic routes)1
5000-5999 - Unused
6000-6999 - Relocated traffic routes2
7000-7999 - Turned back, abandoned, or null routes
8001-8999 - Interchanges3
9101-9199 - WYEs4
9201-9299 - Rest areas5
9301-9399 - Truck escape ramps5
9401-9499 - Others

Location Referencing System PDF

1.  The first digit of a quadrant route is based on the quadrant of the county in which the route is located, as shown in the following diagram (Figure 1).
County numbering example
2.  The last three digits of a relocated traffic route are the same as the traffic route that was relocated.
3.  Interchanges are numbered sequentially.  Odd numbers are given to interchanges along SRs in the north/south direction; even numbers are given to interchanges along SRs in the east/west direction (Figure 2).

Interchange numbering example
4.  WYEs are given odd numbers if the connecting SR is odd numbered, and even numbers if the connecting SR is even numbered.
5.  Rest areas or truck escape ramps are given odd numbers if they connect to the southbound or westbound side of an SR, and even numbers if they connect to the northbound or eastbound side.

Links:
Interactive Traffic Volume Map - PennDOT
Pennsylvania State Highway Transfer Program - PennDOT
Pennsylvania State Highway Video Log - PennDOT
The "Logic" of the Commonwealth Route System - Adam Prince
Pennsylvania's Decommissioned State Routes - Adam Prince
Pennsylvania State Routes - Tim Reichard
Pennsylvania State Route Ends - Adam Prince
The Pennsylvania State Route Numbering System - Tim Reichard


Back to Pennsylvania Highways
Page updated March 26, 2014.
Content and graphics copyright Jeffrey J. Kitsko. All rights reserved.
Information courtesy of the Pennsylvania Department of Transportation.
Site additions, comments, complaints, or questions:  state#pahighways.com (replace "#" with "@").