In Georgia, the most expensive ZIP code is 31561 in Sea Island, where a median home price goes for about $2.75 million, according to GOBankingRates. The state boasts one of the highest figures in ...

There is also another type of postal code, the ZIP + 4 code. According to unitedstateszipcodes.org, the ZIP + 4 was established in 1983 and identifies an even more specific location within a ZIP code.