I've lived in South Jersey all my life (Ocean City area). Anyone will tell you anything above Cherry Hill is North Jersey. Anyone who says otherwise probably lives above Cherry Hill and is a Jets fan.
ok here we go... central jersey on the east is from turnpike exits 7-13. on the west from lambertville to burlington. got it? end of discussion. lol look at it on a map... it makes perfect sense. visit everywhere in new jersey and there is a different feel to each section. south = philly fans mostly. they even talk different central = is all confused... philly, new york, pittsburg, los angeles ...all kinda fans. they (we-i'm from hamilton square) talk like true new jersey people. not as much philly or new york influence here. north = mostly new york fans. if your from the north east theres a good chance you have a new york/jersey accent.
This is like asking "what state are the worst drivers from?" Everyone is going to have a different answer and it's going to depend entirely on where they themselves grew up. In other words, every answer is useless because of the ingrained bias of the answerer.
That's a good question. I'm in central jersey right by exits 8 and 8a (Mercer) and if I drive slightly north it gets more city-ish (New Brunswick, Newark, Edison) and if I drive slightly south east I hit Allentown, Imlaystown and slightly further is the barrens. Id say where I live is right on the border so if you ask me, south jersey starts about a few miles south of me.