Only the section of road in Lower Township is state maintained; the rest is maintained by Cape May County and signed as County Route 633 (CR 633), which extends 0.34 mi (0.55 km)[2] past the southern terminus along Jackson Street and Perry Street to CR 626 in West Cape May.

Route 109 begins at an intersection with CR 633 in the city of Cape May, heading to the northeast on Lafayette Street, a two-lane undivided road that is county-maintained and signed as a part of CR 633, which itself extends past the southern terminus of Route 109 along Jackson Street and Perry Street to CR 626 in West Cape May.

[1][3] The road briefly widens into a four-lane divided highway and intersects U-turn ramps in both directions before the median ends and it crosses over the Cape May Canal on the Cape May County Veterans Memorial Bridge.

Upon crossing the canal, Route 109 becomes a divided highway again and intersects CR 621 (Ocean Drive).

[3] At this point, the route turns to the west and becomes a two-lane undivided road and heads through woods and marshland with some residences.

[9][10] The current high-level bridge over the Cape May Canal was built in 1960, replacing a wooden swing bridge built by the U.S. Government when the Cape May Canal was constructed during World War II.