I thought this site was interesting. It lists all of the Mega Churches in the US.
http://hirr.hartsem.edu/org/faith_me..._database.html
Divide it down into state, and you'll find that in OKC, the largest church is of course LifeChurch. Other notable churches are the more well known ones, like Crossings Community Church, Victory Christian Center, Henderson Hills Baptist, Council Road Baptist, Crossroads Cathedral, Church of the Servant UMC, Cathedral of Praise, etc.
In Tulsa, of course the more notable ones are Church on the Move, FBC Broken Arrow, Victory Christian Center, etc.
An article came out today discussing this. Said most of the mega churches are either non-denominational or Southern Baptist.
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