Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Parsippany-Troy Hills township | 1 | 56,448 | 56,024 | 0.28% | 2,389 | 23.6 | Township |
| Mount Olive township | 2 | 29,492 | 28,813 | 0.83% | 996 | 29.6 | Township |
| Randolph township | 3 | 26,628 | 26,444 | 0.3% | 1,274 | 20.9 | Township |
| Rockaway township | 4 | 26,554 | 25,359 | 0.7% | 636 | 41.7 | Township |
| Morris township | 5 | 23,569 | 23,006 | 0.26% | 1,503 | 15.7 | Township |
| Roxbury township | 6 | 23,299 | 23,018 | 0.4% | 1,118 | 20.8 | Township |
| Montville township | 7 | 22,561 | 22,395 | 0.3% | 1,212 | 18.6 | Township |
| Morristown | 8 | 20,782 | 20,126 | 1.03% | 7,144 | 2.9 | Town |
| Jefferson township | 9 | 20,581 | 20,485 | 0.23% | 528 | 39.0 | Township |
| Dover | 10 | 18,469 | 18,412 | 0.18% | 6,902 | 2.7 | Town |
| Denville township | 11 | 17,192 | 17,072 | 0.26% | 1,434 | 12.0 | Township |
| Madison borough | 12 | 16,619 | 16,902 | 1.14% | 3,854 | 4.3 | Borough |
| Pequannock township | 13 | 15,654 | 15,538 | 0.33% | 2,311 | 6.8 | Township |
| Florham Park borough | 14 | 14,782 | 12,611 | 4.9% | 2,021 | 7.3 | Borough |
| Hanover township | 15 | 14,677 | 14,643 | 0.2% | 1,396 | 10.5 | Township |
| Chatham township | 16 | 11,230 | 10,967 | 0.93% | 1,237 | 9.1 | Township |
| East Hanover township | 17 | 11,163 | 11,080 | 0.23% | 1,418 | 7.9 | Township |
| Lincoln Park borough | 18 | 10,998 | 10,886 | 0.43% | 1,719 | 6.4 | Borough |
| Kinnelon borough | 19 | 10,044 | 9,941 | 0.35% | 557 | 18.0 | Borough |
| Chatham borough | 20 | 9,337 | 9,193 | 0.67% | 3,985 | 2.3 | Borough |
| Boonton | 21 | 8,839 | 8,792 | 0.2% | 3,774 | 2.3 | Town |
| Long Hill township | 22 | 8,623 | 8,601 | 0.12% | 731 | 11.8 | Township |
| Butler borough | 23 | 8,157 | 8,027 | 0.29% | 4,010 | 2.0 | Borough |
| Chester township | 24 | 7,716 | 7,701 | 0.13% | 265 | 29.1 | Township |
| Wharton borough | 25 | 7,461 | 7,248 | 1.57% | 3,589 | 2.1 | Borough |
| Morris Plains borough | 26 | 6,937 | 6,132 | 6.1% | 2,716 | 2.6 | Borough |
| Rockaway borough | 27 | 6,609 | 6,581 | 0.2% | 3,184 | 2.1 | Borough |
| Mendham township | 28 | 5,989 | 5,996 | 0% | 337 | 17.8 | Township |
| Mount Arlington borough | 29 | 5,952 | 5,900 | 0.35% | 2,779 | 2.1 | Borough |
| Mendham borough | 30 | 4,987 | 4,969 | 0.34% | 841 | 5.9 | Borough |
| Mountain Lakes borough | 31 | 4,617 | 4,464 | 0.19% | 1,746 | 2.6 | Borough |
| Boonton township | 32 | 4,425 | 4,374 | 0.29% | 544 | 8.1 | Township |
| Riverdale borough | 33 | 4,111 | 4,098 | 0.15% | 2,029 | 2.0 | Borough |
| Mine Hill township | 34 | 4,019 | 4,005 | 0.33% | 1,369 | 2.9 | Township |
| Harding township | 35 | 3,894 | 3,872 | 0.08% | 194 | 20.1 | Township |
| Netcong borough | 36 | 3,673 | 3,368 | 0.22% | 4,415 | 0.8 | Borough |
| Chester borough | 37 | 1,682 | 1,669 | 0.24% | 1,056 | 1.6 | Borough |
| Victory Gardens borough | 38 | 1,587 | 1,579 | 0.25% | 10,945 | 0.1 | Borough |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Parsippany-Troy Hills township is the largest city in Morris County.
Victory Gardens borough is the smallest city in Morris County.
There are 38 cities in Morris County, New Jersey.