Here's a bunch, courtesy of my iTunes library and its "smart playlist" feature:

Child Ballads:

The Two Magicians (Child Ballad # 44)
The Two Sisters ( # 10)
Three Gypsies ( # 200)
The Three Knights ( # 11)
The Three Ravens ( # 26)
Seven yellow gypsies (# 200)

And some other songs:

Three Fishers
Three Score And Ten
Four Loom Weaver
Four Strong Winds
Four Green Fields
Seven Joys Of Mary
Ten Thousand Miles
The Ten Dollar Bill
Sixteen Tons
Sixteen Come Next Sunday (AKA Seventeen Come Sunday)
Days Of Forty Nine
500 Miles
900 Miles
Thousand Mile Blues
Thousands Are Sailing