Meanwhile that little "th" looks SO peculiar. It's just possible that a place with "th" in its name would buy wheels containing that character, but...hmmm...no.
Yeah, I was going down that path, too, but from what I've read it's not unusual at all for zip codes to morph and change over time due to population growth.
In fact, today's 77027 is approx. 2 miles from today's 77056, so it's not that big of a stretch that it could have been one and now the other over the past 30-plus years. Pres Bush 41 lives in or near 77056, in fact.