Patricia Guinan promises to leave out milk and crackers for Santa Claus on Christmas Eve, 1947.
Elaine Jung is 6, wants a doll's house and carriage, and made sure to ask Santa not to forget her baby sister.
Jimmy O'Brien, 4, asked for a bike and a sailboat. "When Santa asked where he lived," LIFE reported, "he said, 'You know where.'"
Jo Ann Ward, 3, who wanted a doll and a boat, began with aplomb by saying, "Hello, Santa Claus. How you feel?"
"Santa and Mrs. Claus, who sometimes wear red coats to keep in character, answer calls at the F.A.O. Schwartz workshop," LIFE wrote.
Take a look at these heartwarming photos of kids chatting with Santa. See more images of children on the phone with Santa at Life.com.