NJ is summed up in this quote.
"I am from NJ. I curse... a lot. I say "yo", and I say it often. I never had school on Rosh Hashanah or Yom Kippur. I sure as hell don't pump my own gas. I know what real pizza tastes like, and I know that a bagel is much more than a fuckin' roll with a hole in the middle. I judge people by what exit they get off the parkway. I can navigate a circle--with attitude. All good nights must end at a diner--preferably with cheese fries. It's a sub, not a hoagie or, worse yet, a hero, and I wash it down with soda, not pop. Two words... "mother fucker." I don't go to the beach, I go down the shore. And boardwalk brawls are just a part of the atmosphere. Yes, I drink cawfee. I know that 65mph really means 80. I've always lived within 10 minutes of a mall. When someone cuts me off, they get the horn AND the finger. And they expect it. I am from New Jersey, and damn proud of it."
The writers of Harold and Kumar go to White Castle were from Randolph, a stereotypical suburban New Jersey town.