# U.S. Route 15 in Pennsylvania

U.S. Route 15 (US 15) is United States Numbered Highway that runs from Walterboro, South Carolina, north to Painted Post, New York. In Pennsylvania, the highway runs for 194.89 miles (313.65 km), from the Maryland state line just south of Gettysburg, north to the New York state line near Lawrenceville.

## Route description

US 15 enters Pennsylvania south of Gettysburg, Adams County, from Frederick County, Maryland, on a freeway alignment. The route heads to the north and bypasses Gettysburg, where the route has an interchange with US 30. The freeway alignment ends at York Springs, carrying US 15 on a four-lane expressway, then becoming a four-lane arterial road in Dillsburg, until the route upgrades to a freeway again. The route continues north toward Harrisburg, where the freeway terminates again as US 15 joins with US 11. The two routes begin to follow the west shore of the Susquehanna River with limited-access sections until they split across the river from Sunbury. US 15 continues north into Williamsport, joining Interstate 180 (I-180) and US 220. At I-180's western terminus, US 220, signed south, heads due west toward Jersey Shore and Lock Haven, while US 15 turns due north through Mansfield and crosses into New York near Lawrenceville, Tioga County.
The majority of US 15 is four lanes, alternating between limited and unlimited access. There are two segments where the road is two lanes. One is from East Pennsboro Township, Cumberland County, just north of the I-81 interchange, to just south of Duncannon. The other is between White Deer and South Williamsport. The segment between Williamsport and the New York state line will eventually be designated I-99.

## History

With the adoption of the U.S. Numbered Highway System, US 15 originally terminated at Harrisburg, while US 111 serviced the modern route north of that point. In 1937, US 15 was extended north to the New York state line, effectively replacing US 111 north of Harrisburg. However, instead of replacing US 111's old routing directly, US 15 ran along the east bank of the Susquehanna River between Harrisburg and Williamsport. Meanwhile, the road on the western bank of the river was Pennsylvania Route 14 (PA 14) between Lemoyne and Duncannon, US 11 between Duncannon and Shamokin Dam, and PA 404 between Shamokin Dam and Williamsport. In 1941, US 15 was rerouted to follow the western bank of the river between Harrisburg and Williamsport, replacing PA 14 between Lemoyne and Duncannon, running concurrent with US 11 between Lemoyne and Shamokin Dam, and replacing the entire length of PA 404. The former alignment of US 15 on the east side of the river became PA 14.

## Future

The section of US 15 north of Williamsport will gain the additional designation of I-99 when the connection from I-76 to I-86 is completed. No additional work is needed to upgrade this stretch, as it is already up to Interstate standards.
As part of the construction of the Central Susquehanna Valley Thruway, US 15 is planned to be rerouted to the new freeway between Selinsgrove and Union Township, bypassing Shamokin Dam. The former alignment of US 15 through Shamokin Dam will be designated as US 15 Business, partly running concurrent with US 11.

## Major intersections

| County | Location | mi | km | Exit | Destinations | Notes |
| Adams | Freedom Township | 0.0 | 0.0 | | US 15 south (Catoctin Mountain Highway) – Frederick | Continuation into Maryland |
| Adams | Freedom Township | 1.74 | 2.80 | | US 15 Bus. (Steinwehr Avenue) | |
| Adams | Cumberland Township | 5.88 | 9.46 | | PA 134 (Taneytown Road) | |
| Adams | Mount Joy Township | 8.15 | 13.12 | | PA 97 south (Baltimore Pike) | Northern terminus of PA 97; access to Gettysburg National Military Park |
| Adams | Straban Township | 10.01 | 16.11 | | PA 116 (Hanover Road) | |
| Adams | Straban Township | 11.52 | 18.54 | | US 30 (York Street) | Access to Gettysburg College |
| Adams | Straban Township | 14.71 | 23.67 | | PA 394 / US 15 Bus. south – Hunterstown | Northern terminus of US 15 Bus.; access to Gettysburg College |
| Adams | Tyrone Township | 19.59 | 31.53 | | PA 234 – East Berlin, Heidlersburg | |
| Adams | Huntington Township | 23.59 | 37.96 | | PA 94 – Hanover, York Springs | |
| York | Dillsburg–Carroll Township line | | | Northern end of limited-access section | Northern end of limited-access section | Northern end of limited-access section |
| York | Dillsburg–Carroll Township line | 32.51 | 52.32 | | PA 74 south (Baltimore Street) to PA 194 – Dillsburg, York | Southern end of PA 74 concurrency |
| York | Dillsburg–Carroll Township line | 32.72 | 52.66 | | PA 74 north (York Road) – Williams Grove, Carlisle | Northern end of PA 74 concurrency |
| Cumberland | Upper Allen Township | | | Southern end of freeway section | Southern end of freeway section | Southern end of freeway section |
| Cumberland | Upper Allen Township | 36.32 | 58.45 | | Lisburn Road | |
| Cumberland | Upper Allen Township | 37.68 | 60.64 | | PA 114 – Bowmansdale, Mechanicsburg | |
| Cumberland | Upper Allen Township | 38.72 | 62.31 | | Winding Hill Road / Cumberland Parkway | |
| Cumberland | Upper Allen Township | 39.29 | 63.23 | | I-76 / Penna Turnpike – Pittsburgh, Philadelphia | Exit 236 on I-76 / Turnpike |
| Cumberland | Lower Allen Township | 40.31 | 64.87 | | Wesley Drive / Rossmoyne Road | |
| Cumberland | Lower Allen Township | 41.03 | 66.03 | | Slate Hill Road | |
| Cumberland | Lower Allen Township | 41.76 | 67.21 | | Lower Allen Drive | |
| Cumberland | Camp Hill | 42.49 | 68.38 | | US 11 south / PA 581 to I-81 / I-83 – Carlisle, Harrisburg, York | Exit 5 on PA 581; southern end of US 11 concurrency |
| Northern end of freeway section |||
| Cumberland | Camp Hill | 42.99 | 69.19 | | PA 641 west (Trindle Road) – Mechanicsburg | Eastern terminus of PA 641 |
| Cumberland | Camp Hill–East Pennsboro Township line | | | | M. Harvey Taylor Bridge – Harrisburg | Northbound exit and southbound entrance |
| Cumberland | East Pennsboro Township | 47.34 | 76.19 | | PA 944 west (State Street) | Eastern terminus of PA 944 |
| Cumberland | East Pennsboro Township | 50.35 | 81.03 | | I-81 (Capital Beltway) – Carlisle, Harrisburg | Exit 65 on I-81 |
| Perry | Marysville | 52.61 | 84.67 | | PA 850 west (Valley Street) | Eastern terminus of PA 850 |
| Perry | Penn Township | | | Southern end of freeway section | Southern end of freeway section | Southern end of freeway section |
| Perry | Penn Township–Duncannon line | 60.10 | 96.72 | | PA 274 west – Duncannon | Eastern terminus of PA 274 |
| Dauphin | Reed Township | 62.59 | 100.73 | | US 22 / US 322 – Harrisburg, Lewistown | |
| Perry | Watts Township | | | Northern end of freeway section | Northern end of freeway section | Northern end of freeway section |
| Perry | Buffalo Township | 72.78 | 117.13 | | PA 34 south (Hunters Valley Road) – Newport | Northern terminus of PA 34 |
| Perry | Liverpool | 74.54 | 119.96 | | PA 17 west – Millerstown | Eastern terminus of PA 17 |
| Perry | Liverpool Township | 78.90 | 126.98 | | PA 104 north – Middleburg | Southern terminus of PA 104 |
| Juniata | No major junctions | No major junctions | No major junctions | No major junctions | No major junctions | No major junctions |
| Snyder | Penn Township | | | Southern end of freeway section | Southern end of freeway section | Southern end of freeway section |
| Snyder | Penn Township | 91.15 | 146.69 | | PA 35 south – Selinsgrove | Northern terminus of PA 35 |
| Snyder | Monroe Township | 95.58 | 153.82 | | US 522 south – Selinsgrove | Northern terminus of US 522 |
| Snyder | Monroe Township | | | Northern end of freeway section | Northern end of freeway section | Northern end of freeway section |
| Snyder | Shamokin Dam | 96.63 | 155.51 | | PA 61 south / PA 147 south – Sunbury | Interchange; northern terminus of PA 61; southern end of PA 147 concurrency |
| Snyder | Shamokin Dam | 96.98 | 156.07 | | US 11 north – Northumberland, Danville | Northern end of US 11 concurrency |
| Union | Union Township | | | | PA 147 north (Central Susquehanna Valley Thruway) to I-80 / I-180 – Milton | Interchange; northern end of PA 147 concurrency |
| Union | Union Township | 101.83 | 163.88 | | PA 304 west – New Berlin | Eastern terminus of PA 304 |
| Union | East Buffalo Township–Lewisburg line | 105.79 | 170.25 | | PA 45 (Market Street) – Lewisburg|Lewisburg Business District | |
| Union | Lewisburg | 106.25 | 170.99 | | PA 192 west (Buffalo Road) – Cowan | Eastern terminus of PA 192 |
| Union | Kelly Township | | | Southern end of freeway section | Southern end of freeway section | Southern end of freeway section |
| Union | Kelly Township | 110.21 | 177.37 | | PA 642 east (Mahoning Street) – Milton, West Milton, Pottsgrove | Western terminus of PA 642 |
| Union | White Deer Township | 111.78 | 179.89 | | New Columbia | |
| Union | White Deer Township | 112.57 | 181.16 | | I-80 – Bloomsburg, Bellefonte | Exit 210 on I-80 |
| Union | White Deer Township | 114.29 | 183.93 | | Watsontown, White Deer | |
| Union | White Deer Township | | | Northern end of freeway section | Northern end of freeway section | Northern end of freeway section |
| Union | Gregg Township | 116.81 | 187.99 | | PA 44 (Bridge Avenue) – Jersey Shore, Dewart | |
| Lycoming | Clinton Township | 122.66 | 197.40 | | PA 54 east – Montgomery | Western terminus of PA 54 |
| Lycoming | South Williamsport | 128.34 | 206.54 | | PA 554 south (South Market Street) | Northern terminus of PA 554 |
| Lycoming | South Williamsport | 128.95 | 207.52 | | PA 654 west (Southern Avenue) | Eastern terminus of PA 654 |
| Lycoming | Williamsport | 129.35 | 208.17 | Southern end of freeway section | Southern end of freeway section | Southern end of freeway section |
| Lycoming | Williamsport | 129.35 | 208.17 | 27A | I-180 east / US 220 north – Montoursville, Muncy | Southern end of I-180/US 220 concurrency |
| Lycoming | Williamsport | 129.85 | 208.97 | 27B | Hepburn Street | Eastbound exit and westbound entrance |
| Lycoming | Williamsport | 130.53 | 210.07 | 28 | Maynard Street | Access to Pennsylvania College of Technology |
| Lycoming | Williamsport | 131.67 | 211.90 | 29 | Future I-99 south / US 220 south – Lock Haven I-180 ends | Northern end of US 220 concurrency; current southern terminus of I-99; exit number not signed southbound |
| Lycoming | Williamsport | 132.09 | 212.58 | 136 | Third Street | Northbound exit and entrance |
| Lycoming | Williamsport | 132.37 | 213.03 | 136 | Fourth Street | Southbound exit and entrance |
| Lycoming | Old Lycoming Township | 132.99 | 214.03 | 137 | Foy Avenue / High Street / Lycoming Creek Road | |
| Lycoming | Lycoming Township | 136.34 | 219.42 | 140 | Hepburnville | |
| Lycoming | Lycoming Township | 138.90 | 223.54 | 143 | PA 973 – Perryville, Cogan Station | Southbound exit only |
| Lycoming | Lewis Township | 144.00 | 231.75 | 148 | PA 14 north – Trout Run, Canton | Southern terminus of PA 14 |
| Lycoming | Cogan House Township | 148.27 | 238.62 | 152 | Cogan House | Southbound exit and entrancd; access via State Route 4011 |
| Lycoming | Cogan House Township | 148.89 | 239.62 | 152 | Cogan House | Northbound exit and entrance; access via State Route 4011 |
| Lycoming | Cogan House Township | 150.90 | 242.85 | 155 | PA 184 west – Steam Valley | Eastern terminus of PA 184 |
| Lycoming | Jackson Township | 153.68 | 247.32 | 158 | PA 284 west – Buttonwood, English Center | Eastern terminus of PA 284 |
| Tioga | Liberty | 158.81 | 255.58 | 162 | PA 414 – Liberty, Morris | |
| Tioga | Liberty | 160.96 | 259.04 | 165 | Sebring | |
| Tioga | Blossburg | 168.08 | 270.50 | 172 | Blossburg | |
| Tioga | Richmond Township | 175.55 | 282.52 | 179 | US 15 Bus. north / PA 660 west – Canoe Camp, Covington | Southern terminus of US 15 Bus.; eastern terminus of PA 660 |
| Tioga | Mansfield | 177.82 | 286.17 | 182 | US 6 – Mansfield, Wellsboro | Access to Hills Creek State Park and Mansfield University |
| Tioga | Richmond Township | 179.16 | 288.33 | 183 | US 15 Bus. south (Main Street) | Southbound exit and northbound entrance; northern terminus of US 15 Bus. |
| Tioga | Tioga Township | 187.65 | 301.99 | 191 | PA 287 – Tioga, Tioga Junction | |
| Tioga | Lawrence Township | 192.46 | 309.73 | 196 | PA 49 – Elkland, Lawrenceville | Access to Cowanesque Lake |
| Tioga | Lawrenceville | 194.89 | 313.65 | | I-99 north / US 15 north – Corning | Continuation into New York |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus Electronic toll collection Incomplete access |||||||