Don't they use the same western town in a lot of TV shows and films? The town of Medicine Bow resembles, "High Noon," or Fastest Gun Alive," and even, "Gunsmoke." where is it? carson city? Virginia city? some of these places became tourist attractions in the mid 60's.
shareAll filming locations are listed on the main page. Just click on "Filming Locations" link then do the same with the other shows you listed.
I do notice that a lot of sherriff's jurisdiction ues the same jail as Marshal Dillon and that wherever the Virginian characters go by train the station always looks the same at the destination.