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State Route Numbering System
Routes 1, 3, 5, 7, and 9 were found from south to north. Routes 2, 4, 10 & 60, and 8 were found from east to west (10 and 60 were used instead of 6 to avoid duplication with US 6). These nine routes formed a basic grid. The two-digit routes were found near the one-digit route that matched the last digit of the two-digit route. For example, 14, 24, .., 94 are found near 4. The x6 routes were found near where 6 would have gone, between the x4s and the x8s. As examples of the last part of the numbering rule, since US 13, US 40, US 140, and US 240 were assigned, the x13 and x40 parent routes were 113 and 340.
The three-digit parent routes, as described in the last part of the above numbering rule, are explained in greater detail on the US highways page.
Routes 21 (Graysville-Uniontown highway), 31 (Washington-Bedford highway), 41 (Harrisburg-Lancaster highway), and 51 (Pittsburgh-Uniontown highway) still exist today, all along the southern part of the state. 31 used to extend west to Ohio along 136 and 844. 41 used to extend northward along 230 from Lancaster to Harrisburg.
Routes 1, 41, and 81 were three of the main auto trails designated in the state. 1 was the Lincoln Highway (now 68 and 65 from Ohio to Pittsburgh, US 30 from Pittsburgh to Philadelphia, and US 1 to the east of Philadelphia). 41 was the Harrisburg-Lancaster highway, now 230 and bypassed by 283. 41 is now signed as a north-south route southeast of Lancaster and thus violates the original direction rule. 11, despite being the National Pike (now US 40) before 1928, was eliminated in favor of 81 to avoid duplication with US 11. 711 is the parent route of the small x11 family.
61 (Concordville-Chester highway) is now US 322 from US 1 to the Delaware state line. 61 has been reassigned to US 122 from Northumberland to Reading.
71 (Greensburg-Bentleyville highway) is now 136, I-70, and 917 from Greensburg to US 40.
91 (Chester-Philadelphia highway) is now US 13 from Delaware to Philadelphia. 91 was later reassigned to a road paralleling 191 to the east when 191 was 90.
Routes 23 (Lancaster-Philadelphia highway), 53 (Somerset-Bellefonte highway), 63 (Greenlane-Philadelphia highway), 73 (Reading-Philadelphia highway), and 93 (Berwick-Hazleton highway) still exist today, mainly between the central and southern part of the state. 53 is now a north-south route after the part southeast of 144 was renumbered to 144 and thus violates the direction rule.
3 was the William Penn Highway, one of the main auto trails, and extended from Ohio to New Jersey mainly along US 22 (Ohio to Harrisburg), US 322 and US 422 (Harrisburg to Reading), and US 222 (Reading to New Jersey); US 22 was originally assigned along this entire route but was later relocated over 43 east of Harrisburg to Allentown. 3 has been reassigned to the West Chester-Philadelphia highway, which was previously part of 5.
13 was the Chambersburg-Philadelphia highway before 1928, but was eliminated in favor of 17 (Philadelphia to Harrisburg), and 43? (Harrisburg to Carlisle), and 33 (Carlisle to Maryland). In its place, 113 was the parent of the x13 family.
33 was the Lykens Valley Trail, following US 11 (Chambersburg to Carlisle), 34 and 274 (Carlisle to Clark's Ferry), 147 (Clark's Ferry to Millersburg), and US 209 (Millersburg to New York). 33 has been reassigned to the Stroudsburg-Easton expressway.
43 was the Harrisburg-Allentown highway, now called US 22 between those cities. 43 has been reassigned twice: first to the I-76 Schuylkill Expressway from I-276 to New Jersey, and currently to the Mon-Fayette Expressway linking Pittsburgh to Morgantown, WV.
83 was the Schuylkill Haven-Norristown highway, renumbered (when I-83 was designated) as 183 north of Reading and 724 south of Reading.
25 (Millersburg-Hegins highway), 35 (Selinsgrove-Shade Gap highway), 45 (Easton-Ebensburg highway), 75 (Port Royal-Mercersburg highway), and 85 (Kittanning-Home highway) still exist in the center of the state. 35 and 75 are diagonal routes now signed as north-south routes, against the original numbering rule. 45 used to extend west along US 22 to Nanty Glo and east along 61, 54, US 209, and 248 to Easton.
5 was another main auto trail, the Lakes-To-Sea Highway, connecting Erie with Philadelphia and Atlantic City. 5 roughly followed US 6 (Erie to Meadville), US 322 (Meadville to Philipsburg), 350 (Philipsburg to Bald Eagle), 453 (Tyrone to Water Street), US 22, 655, and US 322 (Water Street to Lewistown), US 22/US 322 (Lewistown to Newport), 34 and 274 (Newport to Amity Hall), US 11/US 15 (Amity Hall to Harrisburg), US 322 (Harrisburg to West Chester), and 3 (West Chester to Philadelphia). 5 now appears along the Lake Erie shore after switching places with 99 to match NY 5.
15 was a pre-1928 route that was eliminated in favor of 115 to avoid duplication with US 15. 115 was the Montoursville-Stroudsburg highway, roughly following 154 (Canton to Laporte), secondary roads (Laporte to Red Rock), 118 (Red Rock to Pikes Creek), 29 (Pikes Creek to Wilkes-Barre), and current 115 (Wilkes-Barre to Blakeslee), 940 and 611 (Blakeslee to Stroudsburg). 115 is the parent of the x15 family.
55 was the Bucktail Trail, now 120 from Ridgway to Lock Haven.
65 was the Sharon-Franklin highway, now replaced by US 62.
95 was the Mifflinburg-Centre Hall highway, which was renumbered to 192 when I-95 came to Pennsylvania.
Routes 17 (Benjamin Franklin Highway), 27 (Meadville-Pittsfield highway), 77 (Meadville-Garland highway), 87 (Forksville-Mahoopany highway), and 97 (Erie-Waterford highway) still exist today, between the middle and northern part of the state. 17 is a short piece of the Benjamin Franklin Highway that runs in two segments from Ohio to Philadelphia. Another piece of 17 became 317; the rest is now mainly US 224 and US 422 with US 22 and US 322 between the US 422 segments. 17 was also reassigned to Pennsylvania's piece of I-86 to match NY 17, but that PA 17 has been replaced by I-86. Similarly, a second 97 exists, matching MD 97 upon replacing US 140. 87 was extended to US 220 and is signed north-south, as is the original 97, violating the direction rule.
7 was an original state route, the Roosevelt Highway, which was supplemented with and replaced mainly by US 6.
37 was the short Greeley-Lackawaxen highway that is now the eastern part of 590.
47 was the Kingsley-Carbondale highway, later replaced by US 106 and now designated 106.
57 was the Oil City-Fryburg highway, renumbered for whatever reason to 157.
67 was the Wyalusing-New Milford highway, replaced by US 106 and now designated 706.
29 (Wilkes-Barre-West Chester highway) in two pieces, 49 (Lawrenceville-Coudersport highway), 59 (Port Allegheny-Warren highway), 69 (North Warren-Sugar Grove highway), 89 (Wattsburg-Northeast highway), and 99 (Lake Erie shore highway) still exist today along the northern part of the state. 29 has two pieces because US 309 took over the middle segment. 29 also is the replacement of 22 (a pre-1928 route), renumbered to avoid duplication with US 22. 29 is a direction-rule-breaking route, since the 22 it replaced was the north-south route and 29 should be an east-west number. 89 was always a direction rule violator. 99 is now also a direction rule violator, running north-south, but was an east-west route before swapping routings with 5. The number 99 is now also given to I-99.
9 was the Yellowstone Trail, an original state route. Its initial supplement and later replacement, US 20, leads to Yellowstone National Park in Wyoming. 9 was reassigned to the Northeast Extension Pennsylvania Turnpike until I-476 replaced it.
19 was another main auto trail, the Lewistown-Scranton highway, that was eliminated in favor of 39 to avoid duplication with US 19.
39 was the Lewistown-Scranton highway, now replaced by US 11 and US 522. The current 39 is found further south near Harrisburg as a Rockville-Hershey highway.
79 was the Albion-Union City highway, now replaced by US 6N and US 6. The remaining piece of 79 was renumbered (when I-79 came to Pennsylvania) and later decommissioned.
Routes 32 (Kintnersville-Philadelphia highway), 42 (Laporte-Oxford highway), 52 (Doylestown-West Chester highway), 72 (Lebanon-Lancaster highway), 82 (Birdsboro-Kennett Square highway), and 92 (Susquehanna-Luzerne highway) still exist in the eastern part of the state. 32 was replaced by US 13 from Morrisville to Philadelphia. 42 was replaced by US 120 and US 122 from Centralia to Oxford. 52 was replaced by US 122 and US 202 from West Chester to New Jersey.
2 was a main auto trail , the Lackawanna Trail, and followed US 11 (New York to Scranton) and I-380, 435, and 611 (Scranton to Philadelphia).
12 was another main auto trail, the Baltimore Pike, which followed current 33 and 512 (Scotia to Bethlehem), 378 and 309 (Bethlehem to Philadelphia), and US 1 (Philadelphia to Maryland). 12 has been reassigned to the Warren Street bypass of Reading.
22 was the Allentown-Wilkes-Barre highway, eliminated in 1928 favor of 29 (New York state line to Hazleton), 93 (Hazleton to Mauch Chunk), and ?? (Mauch Chunk to Schnecksville) to avoid duplication with US 22.
62 was the West Chester-Schnecksville highway, renumbered to 100 when US 62 came to Pennsylvania.
14 (Elmira-Gettysburg highway), 24 (Harrisburg-York highway), 34 (Newport-Gettysburg highway), 44 (Shinglehouse-Jersey Shore highway), 54 (Jersey Shore-Elysburg highway), 64 (Laporte-Bedford highway), 74 (Carlisle-York highway), and 94 (York Springs-Hanover highway) still exist today between the middle and eastern parts of the state. 14 used to extend south along US 15, US 220, I-180, 405, 147, US 11/US 15/US 22/US 322 and US 15 to Gettysburg and maybe south along 97 to the Maryland state line. 34 extended south along current Business US 15 to the Maryland line. 44 replaced 54 between Jersey Shore and Turbotville. 54 was a north-south highway, but became east-west upon replacing parts of 45, in violation of the direction rule. 64 has been replaced almost entirely by US 220.
4 was a main auto trail, the Susquehanna Trail, now following US 15 from New York to Harrisburg and I-83 south to the Maryland border.
84 was the Larryville-Tioga highway, renumbered to 287 when I-84 came to Pennsylvania.
16 (McConnellsburg-Greencastle highway), 26 (Huntingdon-Bedford highway), 36 (Pleasantville-Altoona highway), 46 (Bradford-Emporium highway), 56 (New Kensington-Johnstown highway), 66 (Warren-Uniontown highway), 86 (Meadville-Cambridge Springs highway), and 96 (Weyant-Hyndman highway) still exist between the middle and western parts of the state. 16 and 56 have always been east-west routes, in violation of the direction rule. 66 was replaced by US 119 south of Greensburg and by US 62 north of Tionesta. The number 86 is duplicated by I-86.
6 was the Old Monument Trail, a main auto trail, until 1928. 6 was replaced by 10 north of Dubois and by 60 south of Dubois, and the whole route also became US 219, all to avoid duplication with US 6.
76 was the Warfordsburg-Reedsville highway, now called 655 to avoid duplication with I-76.
8 (William Flinn Highway), 18 (Lake City-Waynesburg highway), 28 (Brockway-Pittsburgh highway), 38 (Butler-Emlentown highway), 48 (Monroeville-Elizabeth highway), 58 (Greenville-Harrisville highway), 68 (Clarion-Beaver highway), 88 (Perry Highway), and 98 (Fairville-Meadville highway) still exist in the western part of the state. 8 and 88 were main auto trails. 68 north of Clarion has been replaced by 66. 88 originally followed US 19 north of Pittsburgh to Meadville, was then truncated to Pittsburgh, and was later extended north of Pittsburgh to New Castle along current 65.
78 was the Cochrantown-Slippery Rock highway, renumbered to 173 when I-78 came to Pennsylvania.
None of the x0 routes have survived from the early days.
0 was never assigned.
10 was the Buffalo-Pittsburgh highway. 10 became US 119 (Blairsville to Dubois) and US 219 (Dubois to New York). 10 has been reassigned to replace US 122 from Reading to Oxford.
20, 30, and 40 may never have been assigned to avoid duplication with US 20, US 30, and US 40.
50 followed 64 (Mill Hall to Zion) and 550 (Zion to Bellefonte). US 220 replaced this routing. 50 was reassigned to 28 west of Pittsburgh.
60 was the Dubois-Grantville highway, now US 219. 60 was reassigned to the expressway from Sharon to Pittsburgh via the Pittsburgh International Airport.
70 was the Susquehanna-Carbondale highway, renumbered 171 when I-70 came to the state.
80 was the Pittsburgh-Indiana highway, now 380 in Pittsburgh and 286 to the east. 80 was renumbered to 380 and 286 when I-80 came to the state.
90 was the Hancock-Stroudsburg highway, renumbered 191 when I-90 came to Pennsylvania.