BigPin22 is correct to a point. You must be registered thru a USAWKS sanctioned club in the district you are competing in. If you live in Shawnee County and you wrestles with a club in Jefferson or Douglas county you are crossing a district boundary. If you live in Chase county and you wrestle with a club in Butler or Sedgwick your are crossing a district boundary. This is allowed according to current rules/bylaws and I don't know how you would ever police policy that did not allow it. However, an individual can not just sign up to wrestle in another district without "first" being affiliated with a club in that district.
