31 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 7111 | Irvington | 60,268 |
| 7105 | Newark | 56,696 |
| 7104 | Newark | 55,412 |
| 7003 | Bloomfield | 52,594 |
| 7052 | West Orange | 48,399 |
| 7107 | Newark | 41,907 |
| 7017 | East Orange | 39,557 |
| 7109 | Belleville | 37,893 |
| 7106 | Newark | 36,538 |
| 7103 | Newark | 35,318 |
| 7050 | Orange | 33,523 |
| 7039 | Livingston | 31,091 |
| 7110 | Nutley | 29,695 |
| 7018 | East Orange | 29,216 |
| 7108 | Newark | 27,830 |
| 7112 | Newark | 27,122 |
| 7042 | Montclair | 26,945 |
| 7006 | Caldwell | 26,449 |
| 7040 | Maplewood | 25,384 |
| 7079 | South Orange | 18,648 |
| 7044 | Verona | 14,438 |
| 7078 | Short Hills | 14,287 |
| 7102 | Newark | 13,506 |
| 7043 | Montclair | 13,425 |
| 7009 | Cedar Grove | 13,225 |
| 7114 | Newark | 13,154 |
| 7028 | Glen Ridge | 7,970 |
| 7004 | Fairfield | 7,723 |
| 7041 | Millburn | 7,412 |
| 7068 | Roseland | 6,221 |
| 7021 | Essex Fells | 2,290 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 31 ZCTAs in Essex County, New Jersey (US Census).