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 |
|---|---|---|---|---|---|---|---|
| San Rafael | 1 | 59,027 | 61,137 | -0.89% | 3,559 | 16.6 | City |
| Novato | 2 | 51,248 | 53,142 | -0.92% | 1,872 | 27.4 | City |
| Mill Valley | 3 | 13,655 | 14,201 | -0.99% | 2,855 | 4.8 | City |
| Larkspur | 4 | 12,442 | 13,029 | -1.17% | 4,149 | 3.0 | City |
| Tamalpais-Homestead Valley | 5 | 12,440 | 12,331 | 0.99% | 2,655 | 4.7 | CDP |
| San Anselmo | 6 | 12,394 | 12,808 | -0.83% | 4,633 | 2.7 | Town |
| Corte Madera | 7 | 9,859 | 10,209 | -0.89% | 3,120 | 3.2 | Town |
| Tiburon | 8 | 8,748 | 9,138 | -1.11% | 1,949 | 4.5 | Town |
| Kentfield | 9 | 7,564 | 7,423 | 1.03% | 2,499 | 3.0 | CDP |
| Fairfax | 10 | 7,360 | 7,586 | -0.77% | 3,303 | 2.2 | Town |
| Sausalito | 11 | 6,943 | 7,254 | -1.11% | 3,936 | 1.8 | City |
| Lucas Valley-Marinwood | 12 | 6,374 | 6,738 | 0.32% | 1,112 | 5.7 | CDP |
| Santa Venetia | 13 | 3,700 | 3,891 | -1.15% | 1,010 | 3.7 | CDP |
| Marin City | 14 | 3,544 | 3,040 | 1.78% | 6,600 | 0.5 | CDP |
| Sleepy Hollow | 15 | 2,844 | 2,366 | 1.17% | 959 | 3.0 | CDP |
| Ross | 16 | 2,273 | 2,341 | -0.74% | 1,459 | 1.6 | Town |
| Fairfax | 17 | 2,072 | 1,778 | 7.69% | 2,176 | 1.0 | CDP |
| Belvedere | 18 | 2,024 | 2,127 | -1.27% | 3,900 | 0.5 | City |
| Black Point-Green Point | 19 | 1,747 | 1,738 | 1.81% | 639 | 2.7 | CDP |
| Lagunitas-Forest Knolls | 20 | 1,735 | 1,874 | -0.34% | 409 | 4.2 | CDP |
| Inverness | 21 | 1,496 | 1,497 | 0.88% | 234 | 6.4 | CDP |
| Woodacre | 22 | 1,396 | 1,464 | 0.29% | 777 | 1.8 | CDP |
| Bolinas | 23 | 1,223 | 1,223 | -2.32% | 210 | 5.8 | CDP |
| Petaluma Center | 24 | 990 | 1,020 | 7.61% | 844 | 1.2 | CDP |
| Alto | 25 | 650 | 818 | -0.76% | 5,159 | 0.1 | CDP |
| Dillon Beach | 26 | 468 | 309 | 2.86% | 157 | 3.0 | CDP |
| San Geronimo | 27 | 424 | 176 | -0.24% | 281 | 1.5 | CDP |
| Muir Beach | 28 | 423 | 360 | 1.93% | 858 | 0.5 | CDP |
| Stinson Beach | 29 | 328 | 583 | -6.02% | 368 | 0.9 | CDP |
| Point Reyes Station | 30 | 306 | 210 | -11.05% | 85 | 3.6 | CDP |
| Tomales | 31 | 174 | 160 | -1.14% | 524 | 0.3 | CDP |
| Bloomfield | 32 | 172 | 243 | -7.03% | 21 | 8.1 | CDP |
| Nicasio | 33 | 97 | 123 | 7.78% | 74 | 1.3 | CDP |
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.
San Rafael is the largest city in Marin County.
Nicasio is the smallest city in Marin County.
There are 33 cities in Marin County, California.