List of Interstate Highways in Maryland

The following is a list of Interstate Highways in Maryland. There are currently 16 Interstate Highways that exist entirely or partially in the U.S. state of Maryland. Six of these are primary interstates while ten are auxiliary interstates related to one of the primary interstates. The longest primary interstate in Maryland is Interstate 95 (commonly abbreviated I-95) at 110.01 mi. The shortest primary interstate in Maryland is I-81 at 12.08 mi. I-97 is the shortest primary interstate at 17.62 mi and the shortest intrastate interstate. I-97 is also the only primary interstate to be located entirely within one county and to not connect with any other primary interstate. The longest auxiliary interstate in Maryland is I-695 at 51.48 mi. The shortest auxiliary interstate in Maryland is I-295 at 0.80 mi. All interstates are maintained by the Maryland State Highway Administration except for all of I-395, all of I-895, a small part of I-695, I-95 within and north of Baltimore, and I-83 within Baltimore. Maryland has one unsigned interstate, I-595; that highway is marked as U.S. Route 50 and US 301, which are concurrent with I-595 for its entire length. Maryland has three former interstates which are shaded in dark gray in the list.