Billings Mill Brook begins in Helman Swamp in Lemon Township.
It flows south-southwest through a valley for several tenths of a mile and enters Tunkhannock Township before turning south.
After a few tenths of a mile, it turns southwest for a short distance before turning south-southeast.
After several tenths of a mile, the stream turns south-southwest for several tenths of a mile before receiving Kern Glen Creek, its only named tributary, from the right.
The stream then continues flowing south-southwest as its valley broadens.
After several tenths of a mile, it reaches its confluence with Tunkhannock Creek.

Billings Mill Brook joins Tunkhannock Creek 2.78 miles (4.47 km) upstream of its mouth.
Billings Mill Brook begins in Helman Swamp in Lemon Township. It flows south-southwest through a valley for several tenths of a mile and enters Tunkhannock Township before turning south. After a few tenths of a mile, it turns southwest for a short distance before turning south-southeast. After several tenths of a mile, the stream turns south-southwest for several tenths of a mile before receiving Kern Glen Creek, its only named tributary, from the right. The stream then continues flowing south-southwest as its valley broadens. After several tenths of a mile, it reaches its confluence with Tunkhannock Creek.
Billings Mill Brook joins Tunkhannock Creek 2.78 miles (4.47 km) upstream of its mouth.
Billings Mill Brook