Founded in 1683, Essex County is one of 21 counties in the state of New Jersey. Historically, Essex County was one of four original counties created in East Jersey. The city of Newark is the county seat. With FIPS code of 13, Essex County has a population of 854,917 and area of 126 square miles (326 km2).
List of all cities in Essex County, NJ alphabetically
| City/Town | Postal Code | Area Code |
| Academy, NJ | 07102 | 973/862 |
| Ampere, NJ | 07017 | 973/862 |
| Bank of America, NJ | 07189 | 973/862 |
| Bank of New York, NJ | 07198 | 973/862 |
| Belleville, NJ | 07109 | 973/862 |
| Bloomfield, NJ | 07003 | 973/862 |
| Brookdale, NJ | 07003 | 973/862 |
| Caldwell, NJ | 07006 | 973/862 |
| 07007 | 973/862 | |
| Cedar Grove, NJ | 07009 | 973/862 |
| Cenlar Bank, NJ | 07184 | 973/862 |
| Doddtown, NJ | 07017 | 973/862 |
| East Orange, NJ | 07017 | 973/862 |
| 07018 | 973/862 | |
| 07019 | 973/862 | |
| Essex Fells, NJ | 07021 | 973/862 |
| Fairfield, NJ | 07004 | 973/862 |
| Glen Ridge, NJ | 07028 | 973/862 |
| Grove, NJ | 07003 | 973/862 |
| Ironbound, NJ | 07105 | 973/862 |
| Irvington, NJ | 07111 | 973/862 |
| J P Morgan Chase, NJ | 07193 | 973/862 |
| 07188 | 973/862 | |
| Livingston, NJ | 07039 | 973/862 |
| Maplecrest, NJ | 07040 | 973/862 |
| Maplewood, NJ | 07040 | 973/862 |
| Merrill Lynch Inc, NJ | 07199 | 973/862 |
| Midtown, NJ | 07102 | 973/862 |
| Millburn, NJ | 07041 | 973/862 |
| Montclair, NJ | 07042 | 973/862 |
| 07043 | 973/862 | |
| Newark, NJ | 07101 | 973/862 |
| 07102 | 973/862 | |
| 07103 | 973/862 | |
| 07104 | 973/862 | |
| 07105 | 973/862 | |
| 07106 | 973/862 | |
| 07107 | 973/862 | |
| 07108 | 973/862 | |
| 07112 | 973/862 | |
| 07114 | 973/862 | |
| 07175 | 973/862 | |
| 07184 | 973/862 | |
| 07188 | 973/862 | |
| 07189 | 973/862 | |
| 07191 | 973/862 | |
| 07192 | 973/862 | |
| 07193 | 973/862 | |
| 07195 | 973/862 | |
| 07198 | 973/862 | |
| 07199 | 973/862 | |
| North Caldwell, NJ | 07006 | 973/862 |
| North Center, NJ | 07003 | 973/862 |
| Nutley, NJ | 07110 | 973/862 |
| Orange, NJ | 07050 | 973/862 |
| 07051 | 973/862 | |
| Overbrook, NJ | 07009 | 973/862 |
| Roseland, NJ | 07068 | 973/862 |
| Roseville, NJ | 07107 | 973/862 |
| Short Hills, NJ | 07078 | 973/862 |
| South Orange, NJ | 07079 | 973/862 |
| The Bank of New York, NJ | 07195 | 973/862 |
| Town Center, NJ | 07052 | 973/862 |
| Upper Montclair, NJ | 07043 | 973/862 |
| Upr Montclair, NJ | 07043 | 973/862 |
| V A Hospital, NJ | 07018 | 973/862 |
| Vailsburg, NJ | 07106 | 973/862 |
| Verona, NJ | 07044 | 973/862 |
| Wachovia Bank, NJ | 07191 | 973/862 |
| Washington Park, NJ | 07102 | 973/862 |
| Weequahic, NJ | 07112 | 973/862 |
| West Caldwell, NJ | 07006 | 973/862 |
| 07007 | 973/862 | |
| West Orange, NJ | 07052 | 973/862 |