This is out east of Dallas a ways, but they have a variety of shooting matches, rifle, pistol, rimfire and shotgun. The range is private, but you can attend matches without being a member.
These guys are a little closer to you. They also have a pretty good variety of shooting matches, but no shotgun.
If you're looking specifically for IDPA, this club is fairly active.
Don't know anything about these folks, but it's probably worth contacting them.