The name of the state Mayfield was in was never mentioned, although it was said to be somewhere in the Midwest. But in one episode, the Beaver wanted to earn money with a paper route, to join-in with a friend to buy a surf board. That would suggest Mayfield is near the ocean.
The address of the first house the Cleavers owned in Mayfield was 485 Mapleton Drive, a reference to first season network CBS's then New York headquarters at 485 Madison Avenue. The address of their second home was 211 Pine Street.
Produced by Gomalco Productions (1957-61) and Kayro Productions (1961-63) in association with Revue Productions. Produced at Republic Studios (1957-59) and Universal-International Studios (1959-63). Originally syndicated by MCA-TV, more recently by Program Exchange.
The house on Universal's backlot that was used for the exterior shots of the Cleavers' second home (in Season 3, after the move to ABC) was later used for the exterior shots of Marcus Welby's house. in Marcus Welby, M.D. (1969).
When filming was shifted to Universal's backlot (then known as Universal International) a new house was built. This house remained as a standing set and was later used for many other television programs and motion pictures. It is a popular attraction on Universal's Tour. More than forty years after the show ended, the still standing set is known as "The Cleaver House."
Although the series was still earning good ratings, its star, Jerry Mathers, wanted to retire from acting to focus on his education upon entering high school. As a result, it was agreed to halt production and the series became the first prime time American production to have a series finale.
The pilot of the show, "It's a Small World", was first broadcast on April 23, 1957 on a syndicated anthology series, Studio 57. It did not have a laugh track or the opening a closing theme. It never aired within the series itself.
There are two indications that the Cleavers lived in Wisconsin. In one scene, Wally mentions the high school band is going to Madison to play for the governor. In another episode, the Cleavers are going to a pro football game and repeatedly refer to the Packers.
Ward made at least four references to having attended high school in Shaker Heights, a town located between Mayfield and Cleveland, rendering yet another suggestion that Mayfield was most likely in Ohio.