Most states allow a person to own a slot machine as long as it is at least 25 years old.
The following states are the exceptions:

Alabama: All machines prohibited
Alaska: All machines legal
Arizona: All machines legal
Arkansas: All Machines legal
Colorado: All machines introduced before 1984
Connecticut: All machines prohibited
Florida: Machines must be at least 20 years old
Georgia: Pre 1950
Hawaii: All machines prohibited
Idaho: Pre 1950
Indiana: All machines prohibited
Kansas: Pre 1950
Kentucky: All machines legal
Main: All machines legal
Massachusetts: Machines must be at least 30 years old
Minnesota: All machines legal
Missouri: Machines must be at least 30 years old
Nebraska: Law unknown
New Jersey: Pre 1941
New Mexico: All machines legal
New York: Pre 1941
Nevada: All machines legal
Ohio: All machines legal
Oregon: Pre 1968
Pennsylvania: Pre 1941
South Carolina: All machines prohibited
South Dakota: Pre 1941
Tennessee: All machines prohibited
Texas: All machines legal
Utah: All machines legal
Vermont: Pre 1954
Virginia: All machines legal
Washington D. C.: Pre 1952
West Virginia: All machines legal

If your state is not listed then it is a state

that allows slot machines as long as they are

25 years old.