Ones that I have found worth visiting over the years.
Hunter Museum in Chattanooga
Southwest Museum of the American Indian in Los Angeles
Speed Art Museum in Louisville
The Nelson Museum of the West in Cheyenne
The Nelson-Atkins Museum of Art in Kansas City
Portland Museum of Art in Maine
Newark Museum in New Jersy
Phillips Collection in DC
Ogden Museum of Southern Art in New Orleans
Cincinnati Museum of Art in Ohio
The Nelson-Atkins Museum of Art

Hunter Museum
The Nelson Museum of the West