Bedrock, Colorado is the only town by that name in the U.S., so Postmaster Ruth Swain gets all of the Flintstones' fan mail.
alwaysusezipcode.com, Tiny Fox Lab

The post office in Bedrock, Colorado receives so much fan mail addressed to characters from “The Flintstones” that they have a special stamp for rejecting the mail that says “Return to Sender – Fictitious Cartoon Character.”Tiny Fox Lab Facts

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