Contact Us Waiting is not an option when you need results. Texoma's Law Firm The John Nix Law Office is a full service, bilingual criminal and civil law firm. We offer comprehensive representation for all of North Texas and Southern Oklahoma. Sherman, Texas (903) 868-2600 514 N Elm St Sherman, Texas 75090 McKinney, Texas(877) 655-2529 McKinney, Texas 75090 Fort Worth, Texas (877) 655-2529 4200 West Vickery Boulevard Ft. Worth, Texas 76107