According to
this USA today article:
State high school associations that allow a shot clock in basketball
State: Boys, Girls
California: 35 seconds, 30 seconds
Maryland: none, 30 seconds
Massachusetts: 30 seconds, 30 seconds
New York: 35 seconds, 30 seconds
North Dakota: 35 seconds, 30 seconds
Rhode Island: 35 seconds, 30 seconds
South Dakota: 35 seconds, 35 seconds
Washington: 35 seconds, 30 seconds