Museums--all great,all different
I can add at least one more in Idaho and will try to give a brief description of each.(I have met Don Aslett,know Tom Gasko and have visited the Hoover museum.)
In Idaho,Don Asletts Museum of Clean--Mr Aslett has operated some of the largest and most successful cleaning companies in the US cleaning 1000s of bathrooms,miles of glass and acres of floors and carpets.He has renovated a historic building to show all aspects of cleaning history including vacs.The building can be rented for events and even has a kids space.You may remember D Aslett promoting Eureka at one time.He also sells cleaning & janitorial supplies.
In Ohio,Hoover Historical Center--Located in the original Hoover home(moved to a new location)it shows very early cleaning machines and vacs.After the introduction of the Model O they only show Hoover vacs.They also do an exellent job showing history of the Hoover home,local area,vintage clothing,furniture and more.
In Oregon,Starks vacuum store & Museum--As above Starks is THE place for vacs in their region with a room to the side having a variety of rare and historic vacs and great people willing to show them to any with an interest.
In Missouri,Tacony Vacuum Museum--A modern factory building housing all brands from all periods in the museum that can be used to show best features from the past that can be used in vacs of the future from the factory.The vacs are very well arranged by decades and while they have furniture,rugs and many other household items from each period it is all about the vacuums and related supplies and literature.Visitors will find vacs in good original or restored condition that can be used and demonstrated.
Other can add to this as there are some amazing museums in Europe as well as other US museums with at least a few vacs.