League City is an interesting result. It's a fairly small and partially rural area between Houston and Galveston surrounded by more developed areas. My first thought was that maybe the population is so small that it might throw off the numbers, but then I remembered it's the location of the Texas Killing Fields where in the 70s and 80s there were a string of murders of young girls hitchhiking or otherwise getting rides from strangers on I-45 between Houston and Galveston. Maybe this has something to do with the 99% rate of car ownership? After a community goes through something like that... wouldn't be surprising to me.