There are 31 cities in Mercer County, New Jersey.
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 | State | 2024 Population | 2020 Census | Annual Change | Density (mi²) | Area (mi²) |
|---|---|---|---|---|---|---|---|
| Trenton | 1 | New Jersey | 89,296 | 90,592 | -0.36% | 11,740 | 7.61 |
| Princeton | 2 | New Jersey | 30,182 | 30,610 | -0.35% | 1,682 | 17.95 |
| Princeton Meadows | 3 | New Jersey | 15,773 | 14,261 | 0.6% | 6,185 | 2.55 |
| Mercerville | 4 | New Jersey | 14,624 | 12,783 | 0.9% | 3,965 | 3.69 |
| Hamilton Square | 5 | New Jersey | 12,262 | 11,526 | 1.52% | 2,868 | 4.28 |
| Kendall Park | 6 | New Jersey | 10,752 | 9,852 | 0.6% | 2,844 | 3.78 |
| Monmouth Junction | 7 | New Jersey | 9,794 | 8,911 | 0.22% | 2,236 | 4.38 |
| White Horse | 8 | New Jersey | 9,656 | 9,557 | -0.19% | 3,097 | 3.12 |
| Twin Rivers | 9 | New Jersey | 8,334 | 7,221 | 1.15% | 6,599 | 1.26 |
| Yardville | 10 | New Jersey | 6,602 | 6,208 | 1.52% | 1,621 | 4.07 |
| Heathcote | 11 | New Jersey | 6,207 | 7,389 | -4.36% | 1,980 | 3.13 |
| Hightstown | 12 | New Jersey | 5,843 | 5,883 | -0.17% | 4,739 | 1.23 |
| The College New Jersey | 13 | New Jersey | 4,355 | 3,864 | 0.65% | 10,175 | 0.43 |
| Lambertville | 14 | New Jersey | 4,166 | 4,130 | 0.22% | 3,843 | 1.08 |
| Lawrenceville | 15 | New Jersey | 3,955 | 3,515 | 2.54% | 3,796 | 1.04 |
| Robbinsville Center | 16 | New Jersey | 3,492 | 2,978 | 3.84% | 5,448 | 0.64 |
| Groveville | 17 | New Jersey | 3,491 | 2,953 | 2.28% | 1,578 | 2.21 |
| Pennington | 18 | New Jersey | 2,854 | 2,796 | 0.49% | 2,970 | 0.96 |
| Cranbury | 19 | New Jersey | 2,647 | 2,213 | 4.29% | 2,163 | 1.22 |
| Ten Mile Run | 20 | New Jersey | 2,161 | 1,801 | -1.82% | 851 | 2.54 |
| Princeton Junction | 21 | New Jersey | 2,055 | 1,989 | 0.83% | 1,127 | 1.82 |
| Hopewell | 22 | New Jersey | 1,892 | 1,899 | -0.11% | 2,613 | 0.72 |
| Allentown | 23 | New Jersey | 1,720 | 1,734 | -0.23% | 2,886 | 0.60 |
| Kingston | 24 | New Jersey | 1,615 | 963 | 11.23% | 862 | 1.87 |
| Griggstown | 25 | New Jersey | 1,346 | 858 | 9.97% | 551 | 2.44 |
| Titusville | 26 | New Jersey | 717 | 817 | 3.31% | 1,532 | 0.47 |
| East Rocky Hill | 27 | New Jersey | 487 | 335 | 8.46% | 117 | 4.17 |
| Washington Crossing | 28 | New Jersey | 457 | 548 | -0.65% | 1,821 | 0.25 |
| Skillman | 29 | New Jersey | 131 | 476 | -38.78% | 89 | 1.47 |
| Blawenburg | 30 | New Jersey | 125 | 99 | 5.93% | 206 | 0.61 |
| Windsor | 31 | New Jersey | 118 | 618 | -47.09% | 103 | 1.15 |
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.
Trenton is the largest city in Mercer County.
Windsor is the smallest city in Mercer County.
There are 31 cities in Mercer County, New Jersey.