I was curious about the number of clubs in North America that have four courts or more. Here are the ones I can recall off the top of my head. Please feel free to add to the list.
Buffalo Croquet Club - New York
Merion Cricket Club - Pennsylvania
Mission Hills Croquet Club - California
National Croquet Center - Florida
Ponte Vedra - Florida
Sarasota Croquet Club - Florida
Tulsa Croquet Club - Oklahoma