The main cities in New Jersey and their area code are:
Newark:973, 862, Jersey City: 201, 551, Paterson: 973, 862, Elizabeth: 908 and Edison: 732, 848.
The main airport is the Newark Liberty International Airport.
The main WhatsApp businesses are Professional Services such as IT, legal, financial and Retail Trade in general merchandise and food. You can contact these businesses with WhatsApp.