It is a mostly two-lane, undivided road traversing through farmland in Cumberland, Salem, and Gloucester Counties.

Route 77 heads into a commercial area, passing under a Winchester and Western Railroad line and crossing into Upper Deerfield Township at the junction with Laurel Plaza Drive.

[1][3] Past the Pole Tavern Circle, the route becomes Bridgeton Pike and crosses CR 660.

Past this junction, the route crosses CR 618 and enters Harrison Township.

[1] Route 77 continues northwest and enters Mullica Hill, where it intersects the northern terminus of CR 581 and heads north on South Main Street.

[1][3] Sections of today's Route 77 appear on the earliest historical maps of southern New Jersey, and it may follow a Lenape trail known to early colonists as Cohawkin Road.