Devyn Burnett was last seen at about 3am on Sunday on a canal path in Bonnybridge.
Oliver Dalton, 14, was last seen in the Denny area of Falkirk on Friday afternoon.
Chloe Brand, from Carron in Falkirk, was last seen at around 3.30pm on Friday.
A search was launched after the teen was last seen in Cruden Crescent, Aberdeen, at around 5.30pm on Friday.
Amie Choat, 13, was last seen in the Staunton Rise area of Livingston at around 8.30am on Tuesday.
Abbey Rogan was last seen leaving an address in Kirkcaldy at around 9.45pm on Tuesday.