I never saw The Beverly Hillbillies – not because it was before my time, but because my family's television didn't get ITV in those days. But the Internet and quiz question setters alike seem to agree that this was the fictional address of the Clampett family. I could find very little reliable evidence to support the assertion however; Wikipedia doesn't mention it, and a Google search for "beverly hillbillies address crestview" comes up with only the usual unsubstantiated suspects (funtrivia.com, quora.com, etc.).
Both of these sources will tell you that the mansion shown in the opening credits for The Beverly Hillbillies was in fact 750 Bel Air Road - not in Beverly Hills at all, but in nearby Bel Air. Wikipedia has a page on this stately pile, referring to it as the Chartwell Mansion, which acknowledges the Beverly Hillbillies connection (but doesn't give the address used in the series). It was built in 1933 "in the style of a French chateau" for Lynn Atkinson, a wealthy engineering contractor, as a surprise present for his wife. Sadly the first owners never lived there, after Mrs. Atkinson described it as "so grandiose", not to say "pretentious". Atkinson sold the property in 1945 to the hotelier Arnold Kirkeby. One rumour suggests that Kirkeby had bankrolled the building of the house; another that Atkinson was forced to sell it to pay off a gambling debt.
The mansion was largely rebuilt in the 1980s, and in 2018 it was bought by Rupert Murdoch's eldest son, Lachlan, for a reported $150 million - the highest price for any American home that year, and the highest ever in California.
If you want to read more about 750 Bel Air Road, you can find it on a blog with the catchy title of iamnotastalker.com. (This is my source for much of the above information.)
As for Crestview Drive: a search for that name alone found nothing to do with the Beverly Hillbillies, but it did come up with two addresses in England: one in Orpington, Kent (south-east London) and the other in Lowestoft, Suffolk. A two-bed semi in the former was on sale on Rightmove for £550,000, and a three-bed semi for £100,000 more. Meanwhile in Lowestoft you can get a two-bed detached bungalow for £240,000.
The bungalows in Lowestoft appear to be of 1960s or 70s vintage, so you have to wonder whether the developers knew about the Hillbillies. I don't think you could say that about those in Orpington however; those semis look more like the 1930s, and Crest View is spelt as two different words.
© Haydn Thompson 2021