Kentucky: 2am for most of the state, but 4am in Louisville
Louisiana: Bars can technically serve 24 hours a day if there's no law stating they can't.
Massachusetts: 1am for most of the state, but 2am in Boston
Mississippi: 12am, with some individual cities setting it at 1am or later
Missouri: 1:30am most of the week, but 12am on Sundays
Nebraska: 1am, but 2am in some larger cities
Nevada: 24 hours a day!
New Hampshire: 1am, but some towns allow ordering until 2am
New Jersey: The state allows towns to regulate closing time on a local level.