From the Houston Chronicle.
"In Texas, they are most common in towns and cities southeast of a line extending from Dallas to Austin, San Antonio, Laredo and including Houston," said Dan Brooks, curator of vertebrate zoology at the Houston Museum of Natural Science. "Some of the most concentrated populations in our region are in Bellaire, communities along upper Galveston Bay, like League City, and some areas surrounding downtown," Brooks said.
https://www.houstonchronicle.com/news/article/Monk-parakeets-are-a-fun-outdoor-surprise-6691473.php