Over time, zip codes became part of everyday speech, transcending their functional origins — the epitome of which occurred in 1990, when "Beverly Hills, 90210" debuted on Fox that October.

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.

(Updated at 2:25 p.m.) Arlington's 22201 ZIP code, which contains Clarendon, Courthouse Virginia Square and part of Ballston, is the top area for "educated millennials" in the country, according ...