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Interstate Highways of the Maryland highway system
Standard route signs in Maryland
Map
Interstate Highways highlighted in red
Highway names
InterstatesInterstate X (I-X)
System links

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 (177.04 km). The shortest primary interstate in Maryland is I-81 at 12.08 mi (19.44 km). I-97 is the shortest primary interstate at 17.62 mi (28.36 km) 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 (82.85 km). The shortest auxiliary interstate in Maryland is I-295 at 0.80 mi (1.29 km). 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.

Number Length (mi)[1] Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
I-68 81.09 130.50 I-68 at the West Virginia state line near Friendsville I-70 / US 40 / US 522 in Hancock 01991-01-011991[2] current Formerly designated as US 48.
I-70 91.85 147.82 I-70 / US 522 at the Pennsylvania state line in Hancock I-695 / MD 570 in Woodlawn 01962-01-011962[3] current Frederick–Baltimore section was designated I-70N in 1965;[4] that section became part of I-70 in 1974[5]
I-70N 93.62 150.67 I-70 in Frederick MD 122 / Park and ride in Baltimore 01965-01-011965[3] 01974-01-011974 Frederick–Baltimore section was designated I-70N in 1965;[4] that section became part of I-70 in 1974[5]
I-70S 32.60 52.46 I-495 / MD 355 in Bethesda I-70 / US 40 in Frederick 01959-01-011959[6] 01974-01-011974 Designated I-70S in 1959; became I-270 in 1974[5]
I-81 12.08 19.44 I-81 at the West Virginia state line in Williamsport I-81 at the Pennsylvania state line near Hagerstown 01959-01-011959[6] current
I-83 34.50 55.52 Fayette Street and President Street in Baltimore I-83 at the Pennsylvania state line at Maryland Line 01959-01-011959[6] current
I-95 109.01 175.43 I-95 / I-495 at the Virginia state line near Oxon Hill I-95 at the Delaware state line near Elkton 01963-01-011963[7] current
I-97 17.62 28.36 US 50 / US 301 in Parole I-695 / I-895 in Ferndale 01987-01-011987[8] current
I-170 1.40 2.25 US 1 / US 40 in Baltimore US 40 in Baltimore 01981-01-011981[9] 01985-01-011985[10] Replaced by US 40
I-195 4.35 7.00 I-95 / MD 166 in Arbutus MD 170 near BWI Airport 01989-01-011989[11] current
I-270 32.60 52.46 I-495 / MD 355 in Bethesda I-70 / US 40 in Frederick 01974-01-011974[6] current Designated I-70S in 1959; became I-270 in 1974[5]
I-270Y 2.10 3.38 I-495 near Bethesda I-270 near North Bethesda 01974-01-011974 current Known as I-270 Spur but referred to as I-270Y by MDSHA. Was originally I-270 when the current I-270 was I-70S.
I-295 0.80 1.29 I-95 / I-495 / MD 210 in Oxon Hill I-295 in Washington, D.C. 01965-01-011965[4] current
I-370 2.54 4.09 Sam Eig Highway in Gaithersburg MD 200 in Redland 01989-01-011989[11] current
I-395 1.33 2.14 I-95 in Baltimore Howard Street and Camden Street in Baltimore 01981-01-011981[9] current
I-495 41.09 66.13 I-95 / I-495 at the Virginia state line near Oxon Hill I-495 at the Virginia state line near Cabin John 01963-01-011963[7] current Beltway around Washington, D.C.
I-595 19.97 32.14 I-95 / I-495 / US 50 near Glenarden US 50 / US 301 / MD 70 in Parole 01991-01-011991 current Unsigned highway; signed as US 50 and US 301
I-695 51.46 82.82 Beltway around Baltimore 01959-01-011959[6] current
I-795 8.99 14.47 I-695 in Pikesville MD 140 / MD 795 in Reisterstown 01985-01-011985[10] current
I-895 14.87 23.93 I-95 in Elkridge I-95 in Baltimore 01979-01-011979[12] current
I-895A 0.71 1.14 I-97 in Brooklyn Park I-895B in Brooklyn Park 01957-01-011957 current Northward Unsigned highway extension of I-97
I-895B 2.67 4.30 MD 2 in Brooklyn Park I-895 in Brooklyn Park 01957-01-011957 current Unsigned highway except for mile marker posts
  •       Former

See also[edit]

References[edit]

  1. ^ Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved 2012-10-06.
  2. ^ Maryland State Highway Administration (1991). Maryland: Official Highway Map (PDF) (Map). Baltimore: Maryland State Highway Administration.
  3. ^ a b Maryland State Roads Commission (1962). Maryland: Official Highway Map (PDF) (Map). Baltimore: Maryland State Roads Commission.
  4. ^ a b c Maryland State Roads Commission (1965). Maryland: Official Highway Map (PDF) (Map). Baltimore: Maryland State Roads Commission.
  5. ^ a b c d Maryland State Highway Administration (1974). Maryland: Official Highway Map (PDF) (Map). Baltimore: Maryland State Highway Administration.
  6. ^ a b c d e Maryland State Roads Commission (1959). Maryland: Official Highway Map (PDF) (Map). Baltimore: Maryland State Roads Commission.
  7. ^ a b Maryland State Roads Commission (1963). Maryland: Official Highway Map (PDF) (Map). Baltimore: Maryland State Roads Commission.
  8. ^ Maryland State Highway Administration (1987). Maryland: Official Highway Map (PDF) (Map). Baltimore: Maryland State Highway Administration.
  9. ^ a b Maryland State Highway Administration (1981). Maryland: Official Highway Map (PDF) (Map) (1981–1982 ed.). Baltimore: Maryland State Highway Administration.
  10. ^ a b Maryland State Highway Administration (1985). Maryland: Official Highway Map (PDF) (Map) (1985–1986 ed.). Baltimore: Maryland State Highway Administration.
  11. ^ a b Maryland State Highway Administration (1989). Maryland: Official Highway Map (PDF) (Map). Baltimore: Maryland State Highway Administration.
  12. ^ Maryland State Highway Administration (1979). Maryland: Official Highway Map (PDF) (Map) (1979–1980 ed.). Baltimore: Maryland State Highway Administration.
source: https://en.wikipedia.org/wiki/List_of_Interstate_Highways_in_Maryland