Aladdin
Arizona Charlies
Binions Horsehoe
California Club
Castaways
Circus Circus
Desert Inn
Dunes
El Cortez
Fitzgeralds
Four Queens
Fremont
Frontier
Gold Coast
Golden Gate
Hacienda
Lady Luck
Las Vegas Club
Maxim
Orleans
Palace Station
Riviera
Sahara
Sams Town
San Remo
Showboat
Silver Slipper
Stardust
Stratosphere
Thunderbird
Tropicana
Union Plaza
Westward Ho

33 that I can recall, over 41 years. I think I probably spent more nights in the Hacienda than any other.