Famous (or not) for a few things:

(1) You always hear it wrongly repeated that the first nuclear bomb was tested at Alamagordo but Alamagordo is 100 miles from the Trinity Site. San Antonio, NM was the closest settlement.

(2) Conrad Hilton, founder of the hotel chain, was born there (in his autobiography "Be My Guest" he talks about riding his horse up to Socorro, where I went to undergrad school)

(3) The Owl Bar and Cafe still serves a great green chili cheeseburger

https://sanantonioowl.com/

there was that time I ran from Socorro to San Antonio in a race and, despite being underage, got offered a beer from the bartender.

San Antonio is Spanish for “Saint Anthony”. The city in Texas is well known but there are many places in the world that share the name.

It's crazy that two states have cities of the same name?