"Believe It or Not!" was a syndicated newspaper feature, meaning it was published in
hundreds of newspapers across the United States and around the world. It's difficult to give an exact number because the syndication changed over time, and records are incomplete.
The feature began in 1919 and ran until 1949, when Robert Ripley's death. While Ripley's "Believe It or Not!" was popular in newspapers, it also expanded to other media, like radio, television, books, and exhibitions.