There are Reformed churches in some "non-Reformed" denominations, too. My own church is in the Southern Baptist Convention, which is not officially Reformed at all - yet our church subscribes fully to the London Baptist Confession, which closely mirrors the Westminster Confession with exceptions in hermeneutics, baptism, and polity. It is far more Reformed in practice than my former church which belongs to an "officially Reformed" denomination.

Perhaps a Google search of churches that subscribe to at least the "Three Forms of Unity" (three major confessions of faith that define Reformed orthodoxy). Among Southern Baptists, most of the churches that teach and practice the Reformed faith are listed at the Founders web site.

Been there too,
Robin