Interstate 66

Interstate 66 marker
Interstate 66
I-66 highlighted in red
Route information
Length76.28 mi (122.76 km)
ExistedAugust 14, 1957–present
NHSEntire route
RestrictionsNo trucks on Custis Memorial Parkway or Theodore Roosevelt Bridge
Major junctions
West end I-81 near Middletown, VA
Major intersections
East end US 29 in Washington, D.C.
Location
CountryUnited States
StatesVirginia, District of Columbia
CountiesVA: Frederick, Warren, Fauquier, Prince William, Fairfax, Arlington
DC: City of Washington
Highway system
← SR 65VA→ SR 67
← US 50DC→ I-95

Interstate 66 (I-66) is a 76.32 mile east–west interstate highway in the eastern United States. The highway runs from an interchange with I-81 near Middletown, Virginia, on its western end to an interchange with U.S. Route 29 (US 29) in Washington, D.C., at the eastern terminus. The route parallels State Route 55 (SR 55) from its western terminus at I-81 to Gainesville, Virginia, and US 29 from Gainesville to its eastern terminus in Washington. I-66 is unrelated to US 66, which was located in the Midwest-West region of the United States.

The E Street Expressway is a spur from I-66 into the Foggy Bottom neighborhood of Washington, D.C.

Planned expansions of I-66, including an auxiliary route, I-266, were ended by community opposition in the 1970s. I-266 would have begun in Arlington, Virginia, and terminated in Washington at K Street NW.

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