Not saying these rankings are the be-all, end-all, but may provide a semi-decent comparison between different states:
America
Charlotte metro (about 1.75 million people):
Weddington #416
Ardrey Kell #469
Providence #643
(some will probably argue Marvin Ridge will make this list soon but I think is too new? Did some of their students come from Weddington?)
Houston metro (about 6 million people) (tried to google map some of these places but forgive me if I left out other schools considered to be in their metro as I'm not familiar with the area):
Andrew Carnegie Vanguard #13
Westlake Academy #18
Eastwood Academy #72
Debakey High School for Health Professions #75
Houston? School for the Performing and Visual Arts #162
Seven Lakes #277
Memorial #307
Cinco Ranch #354
The Woodlands College Park #382
Clear Horizons Early College #401
Harmony Science Academy #404
Westchester Academy for International Studies #414
Bellaire #439
Challenge Early College #446
Kipp Houston #522
Cypress Woods #536
James E. Taylor #599
Yes Prep North Central Campus #611
The Woodlands #626
Clear Lake #634
Stratford #700
Glenda Dawson #805
Yes Prep Southeast #862
Mirabeau Lamar #883
Dulles #950
Clear Creek #951
Friendswood #952
Mount Carmel Academy #957
Cypress Ranch #969
Little Rock metro (about 700,000 people):
Little Rock Central #810
So obviously Houston is a much bigger metro, and they snuck quite a few schools on the list between 950-1000, but there does seem to be a lot of good schools there (edit: although I don't think any schools in the "Klein" district mentioned in the OP made the list). I also think it's a little strange that they include charter/magnet type schools on these lists, which it appears a number of the Houston ones are.