Direction:

North/South

Southern Terminus:

Pennsylvania Turnpike (I-70/I-76) and US 220 in Bedford

Northern Terminus:

I-80/US 220 and Jacksonville Road (PA 26) in Bellefonte

Distance:

85.74 miles

Counties:

Bedford, Blair, Centre

Signed:

Yes

I-99 is a north/south highway that, when completed, will extend from the Pennsylvania Turnpike (I-70/I-76) in Bedford, Pennsylvania, to the Southern Tier Expressway (I-86/NY 17) in Painted Post, New York. The portion in New York has been fully completed, while the section in Pennsylvania has only been upgraded to interstate standards and assigned the I-99 designation south of I-80. The portions of Future I-99 north of I-80 are designated US 220 and US 15. In New York, the US 15 designation continues and is multiplexed with I-99 for its entire length in the state.

Unlike most other interstates, I-99 had its route number written into federal law by Congress. It is a few hundred miles out of place under the numbering scheme where interstates increase from west to east. According to an article in The New York Times, the number was selected by Senator Bud Shuster of Pennsylvania based on a street car that once existed in the region.

The existing portion of I-99 in Pennsylvania is multiplexed with US 220 for its entire length. It has no direct connection to any other interstate. The exit at its southern terminus requires motorists to travel along a short section of Business US 220 to access the Pennsylvania Turnpike (I-70/I-76). At the current northern terminus, it narrows down to become a two-lane surface road just south of I-80. Construction work began in 2024 to upgrade this interchange and provide a direct connection.