| Zip Code | City | Population ↓ |
|---|---|---|
| 7960 | Morristown | 46,560 |
| 7054 | Parsippany | 30,392 |
| 7801 | Dover | 26,548 |
| 7869 | Randolph | 26,058 |
| 7866 | Rockaway | 22,383 |
| 7950 | Morris Plains | 21,738 |
| 7928 | Chatham | 19,559 |
| 7834 | Denville | 18,048 |
| 7405 | Butler | 17,993 |
| 7940 | Madison | 17,798 |
| 7005 | Boonton | 15,106 |
| 7828 | Budd Lake | 14,083 |
| 7853 | Long Valley | 12,548 |
| 7836 | Flanders | 12,034 |
| 7885 | Wharton | 11,673 |
| 7438 | Oak Ridge | 11,209 |
| 7936 | East Hanover | 11,102 |
| 7444 | Pompton Plains | 10,941 |
| 7932 | Florham Park | 10,941 |
| 7035 | Lincoln Park | 10,922 |
| 7045 | Montville | 10,240 |
| 7034 | Lake Hiawatha | 10,064 |
| 7945 | Mendham | 9,698 |
| 7876 | Succasunna | 9,527 |
| 7981 | Whippany | 8,938 |
| 7849 | Lake Hopatcong | 8,573 |
| 7930 | Chester | 8,138 |
| 7850 | Landing | 7,266 |
| 7058 | Pine Brook | 6,052 |
| 7082 | Towaco | 5,612 |
| 7440 | Pequannock | 4,620 |
| 7046 | Mountain Lakes | 4,499 |
| 7856 | Mount Arlington | 4,429 |
| 7927 | Cedar Knolls | 4,181 |
| 7852 | Ledgewood | 4,095 |
| 7457 | Riverdale | 4,081 |
| 7803 | Mine Hill | 3,990 |
| 7857 | Netcong | 3,564 |
| 7946 | Millington | 2,991 |
| 7980 | Stirling | 2,978 |
| 7933 | Gillette | 2,661 |
| 7847 | Kenvil | 1,685 |
| 7878 | Mount Tabor | 740 |
| 7935 | Green Village | 472 |
| 7976 | New Vernon | 355 |
| 7961 | Convent Station | 343 |
| 7970 | Mount Freedom | 257 |
| 7926 | Brookside | 69 |
| 7870 | Schooleys Mountain | 29 |
| 7842 | Hibernia | 0 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 50 ZCTAs in Morris County, New Jersey (US Census).