Seventh-grader Isabella Oleschuk was reported missing Sunday morning.
Orange Police Chief Robert Gagne made the announcement Wednesday just as police and Oleschuk's parents were about to hold a news conference.
"I am thrilled to be able to announce to you that she has been found," Gagne said. "She is safe."
A girl matching Isabella's description was seen Sunday morning walking and holding hands with a boy slightly taller than her at a nearby pond. He said the jogger who saw them did not notice any signs of distress.
It is unclear if that boy was the friend she was found with.
The Rev. Tod King, a pastor at the Orange Congregational Church, said Isabella is "a delightful child" who is quiet and bright and loves animals and nature.
The three-day search involved dogs as well as an FBI helicopter and an airplane. Crews also searched the woods behind the girl's house.