That is the same ZIP I use for calculating UPS rates to the west coast
It tends to catch in my mind for some reason...
The rate difference is due to economies of scale, it is like a bulk buy discount, there are many more users in Beverly Hills than in your neighborhood (I'm guessing but pretty sure) so they can divide the costs of the towers and service personnel over a larger number of bills. Is it truly fair, no, probably not but it is life.
You see the same thing in many other industries. In an opposite example, the Wegmans market in my area charges much less for most items than the Wegmans in the larger (higher cost of living) markets of Rochester NY or Buffalo. Pricing is regional and varies on costs and what people are willing to pay.