State Route 784/Dale Boulevard begins at the SR 642 (Hoadly Road)/SR 643 (Purcell Road) intersection in northern Dale City where it continues southeast serving many residential areas and providing primary access to parks, schools, and shopping plazas in the area.

The road continues southeast from there and passes through more residential areas before intersecting Benita Fitzgerald Drive then Gideon Drive (which heads north towards Potomac Mills) and heading east passing the PRTC OmniRide Transit Center and forming a cloverleaf interchange with Interstate 95.

SR 784 then ends at U.S. Route 1, with continuation beyond the southeastern terminus as Rippon Boulevard heading towards the Potomac River.

[1] Since July 4, 1970, Dale City has held a nearly 2.5 mi (4.0 km) annual Independence Day parade along SR 784/Dale Boulevard from Mapledale Avenue and Queensdale Drive at Mapledale Plaza to the Center Plaza at Gemini Way near Minnieville Road.

The parade usually consists of parade floats, marching bands from local schools, churches, and community groups, martial arts and cheerleading performances, and convoys of motorcycles, police cars and fire engines, and PRTC buses.