Elinor Trotta, 3, was kidnapped by her father, Michael Trotta, 43, in New Castle, Delaware after he assaulted her mother.
Michael Trotta is said to have grown up in Carbon County and lived in Lansford several years ago.
Police believe Trotta may have fled with the girl to New Jersey or New York City.
Michael Trotta is described as white, 5 feet 8 inches tall, 160 pounds, balding, and with a scruffy beard and mustache.
Elinor is 60 pounds with brown shoulder-length hair and was last seeing wearing a purple puffy coat, pink pants and "Frozen" sneakers.
