Echo Valley 2-6809 parodies the 1970s TV music group, the Partridge Family.
Echo Valley 2-6809 is a phone number that is a title of a Partridge Family song by the same name. Many years ago, phone numbers were 7 digits. The first two digits were often listed as the letters on the phone dial. So, this phone number was EV2-6809. The "EV" letters were pronounced as "Echo Valley." Later, the letters were dropped and only numerals were used in phone numbers.