Voter registration in the United States is required for voting in federal, state and local elections in the United States. The only exception is North Dakota, although cities in North Dakota may register voters for city elections. Voter registration takes place at the county level in many states and at the municipal level in several states. Most states set cutoff dates for voter registration and to update details, ranging from 2 to 4 weeks before an election; while a third of states have Election Day or "same-day" voter registration which enables eligible citizens to register or update their registration when they vote before or on election day.