BOSTON (CBS) – Are you registered to vote? Those who want to cast a ballot in next month’s state primaries have until Wednesday to take action.

Massachusetts Secretary of State Bill Galvin wants to let Bay Staters know that Aug. 15 is the last day they can register to vote in time for the Sept. 4 primaries. Wednesday is also the deadline for voters to change their political party or address.

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Those registered as independents in Massachusetts can vote in whichever party primary they want.

Residents can check their voter registration information here. To register to vote or to make changes to registration, visit www.RegisterToVoteMA.com

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City and town election offices will be open until 8 p.m. on Wednesday to let people register to vote in person. Anyone registering to vote by mail must have their forms postmarked by Aug. 15.