I have friends in NJ who never mentioned Yom Kippur being a state holiday and any banks closing or even most government offices across the state..
I find that mystifying.
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I live close to Lakewood, everything shuts down for Yom Kippur
Businesses, schools, local government, I am not 100% sure about the state though, since I would never notice when it is shut down. Trenton is 100% useless as it is