I didn't call them but this is what their website says: "Credit Union of Texas membership is open to almost anyone in the Dallas Metroplex area, and East Texas communities"
https://www.cutx.org/about
I'm with Gullo, they've been decent. Basically told me when I got a VIN and when my build date got moved. They haven't reached out this week tho
I don't think some Houston zip codes qualify for Credit Union Texas, which is a bummer. Those are great rates.