Direction:
East/West
Western Terminus:
I-81 in Middletown
Eastern Terminus:
Virginia-District of Columbia state line
Distance:
74.52 miles
Counties:
Warren, Fauquier, Prince William, Fairfax, Arlington
Signed:
Yes

I-66 is an east/west highway connecting Washington to its suburbs and exurbs. It begins at I-81 in Middletown, near Winchester and Front Royal, and runs east to a bridge over the Potomac River to Washington. It ends a short distance after crossing the bridge.

While it is technically Route 66 because of its I-66 designation, it has no connection to the famed Route 66 of the American West, which is US 66 and doesn't come anywhere near Virginia.

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