I found mine though Ravelry. I live in Texas and there's a group called "Texas Knitters and Hookers". I am sure there are many groups in Houston. I found this just now:
1[I]. Houston/Heights Area
When: Every Friday evening
Time: People show up as early as 3 or 4 pm and many stick around until the shop closes at 8 pm
Where: Yarns 2 Ewe
- Not a "formal" SnB, but every Friday at Twisted Yarns a large group gathers to sit & knit.
When: Friday mornings/afternoons
Time: 10am - ??? (We often call out to order lunch or bring a sack lunch and eat there.)
Where: Twisted Yarns
Notes: Bring what you're working on, sit, knit, chat and have fun![/I]
I also just typed in Houston under the groups (on Rav) search link and a bunch of group came up. There are at least 4 LYS in Houston, so I know there are knitting circles. Good luck.