38 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Parsippany-Troy Hills | 1 | 56,889 | 56,024 | 0.14% | 2,407 | 24 | Township |
| Mount Olive | 2 | 29,617 | 28,815 | 0.2% | 1,000 | 30 | Township |
| Montville | 3 | 28,098 | 22,392 | 6.93% | 1,509 | 19 | Township |
| Rockaway | 4 | 27,601 | 25,360 | 1.3% | 661 | 42 | Township |
| Randolph | 5 | 26,932 | 26,430 | 0.28% | 1,288 | 21 | Township |
| Morris | 6 | 23,863 | 23,009 | 0.29% | 1,522 | 16 | Township |
| Roxbury | 7 | 23,477 | 23,020 | 0.17% | 1,126 | 21 | Township |
| Morristown | 8 | 20,802 | 20,121 | 0.17% | 7,151 | 3 | Town |
| Jefferson | 9 | 20,783 | 20,485 | 0.19% | 533 | 39 | Township |
| Dover | 10 | 19,633 | 18,406 | 1.88% | 7,337 | 3 | Town |
| Denville | 11 | 17,562 | 17,098 | 0.53% | 1,465 | 12 | Township |
| Madison | 12 | 16,601 | 16,902 | 0.14% | 3,850 | 4 | Borough |
| Pequannock | 13 | 15,817 | 15,539 | 0.24% | 2,335 | 7 | Township |
| Hanover | 14 | 15,793 | 14,644 | 2.27% | 1,502 | 11 | Township |
| Florham Park | 15 | 15,243 | 12,615 | 2.38% | 2,084 | 7 | Borough |
| Chatham | 16 | 11,522 | 9,191 | 6.76% | 4,918 | 2 | Borough |
| Chatham | 17 | 11,448 | 10,969 | 0.72% | 1,261 | 9 | Township |
| East Hanover | 18 | 11,270 | 11,085 | 0.17% | 1,431 | 8 | Township |
| Lincoln Park | 19 | 11,056 | 10,885 | 0.12% | 1,728 | 6 | Borough |
| Kinnelon | 20 | 10,166 | 9,947 | 0.29% | 563 | 18 | Borough |
| Boonton | 21 | 8,920 | 8,796 | 0.15% | 3,809 | 2 | Town |
| Long Hill | 22 | 8,738 | 8,602 | 0.26% | 741 | 12 | Township |
| Butler | 23 | 8,230 | 8,022 | 0.21% | 4,046 | 2 | Borough |
| Chester | 24 | 7,816 | 7,702 | 0.26% | 268 | 29 | Township |
| Wharton | 25 | 7,538 | 7,251 | 0.63% | 3,626 | 2 | Borough |
| Rockaway | 26 | 6,675 | 6,582 | 0.18% | 3,215 | 2 | Borough |
| Morris Plains | 27 | 6,612 | 6,132 | 0.17% | 2,589 | 3 | Borough |
| Mendham | 28 | 6,087 | 6,010 | 0.25% | 342 | 18 | Township |
| Mount Arlington | 29 | 6,001 | 5,898 | 0.18% | 2,802 | 2 | Borough |
| Mendham | 30 | 5,020 | 4,957 | 0.2% | 847 | 6 | Borough |
| Mountain Lakes | 31 | 4,660 | 4,462 | 0.17% | 1,762 | 3 | Borough |
| Boonton | 32 | 4,496 | 4,376 | 0.4% | 553 | 8 | Township |
| Mine Hill | 33 | 4,451 | 4,004 | 3.25% | 1,516 | 3 | Township |
| Netcong | 34 | 4,399 | 3,367 | 5.69% | 5,287 | 1 | Borough |
| Riverdale | 35 | 4,160 | 4,099 | 0.22% | 2,053 | 2 | Borough |
| Harding | 36 | 3,974 | 3,873 | 0.48% | 198 | 20 | Township |
| Chester | 37 | 1,707 | 1,670 | 0.35% | 1,072 | 2 | Borough |
| Victory Gardens | 38 | 1,602 | 1,579 | 0.19% | 11,048 | 0 | Borough |
Parsippany-Troy Hills is the largest city in Morris County, with a population of 56,889.
Victory Gardens is the smallest city in Morris County, with a population of 1,602.
There are 38 cities in Morris County, New Jersey.