31 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Marysville | 1 | 3,415 | 3,448 | -0.2% | 749 | 5 | City |
| Marysville | 2 | 2,503 | 2,442 | 0.48% | 50 | 50 | Township |
| Blue Rapids City | 3 | 1,006 | 1,015 | -0.3% | 28 | 36 | Township |
| Blue Rapids | 4 | 919 | 926 | -0.22% | 463 | 2 | City |
| Vermillion | 5 | 890 | 894 | 0.11% | 25 | 36 | Township |
| Waterville | 6 | 763 | 774 | -0.26% | 21 | 36 | Township |
| Frankfort | 7 | 725 | 728 | -0.14% | 720 | 1 | City |
| Waterville | 8 | 648 | 658 | -0.31% | 1,317 | 0 | City |
| Murray | 9 | 608 | 602 | 0.33% | 17 | 36 | Township |
| Home | 10 | 528 | 520 | 0.57% | 15 | 36 | Township |
| Axtell | 11 | 407 | 397 | 0.49% | 778 | 1 | City |
| Guittard | 12 | 384 | 390 | -0.26% | 11 | 36 | Township |
| Marysville | 13 | 255 | 259 | 0% | 8 | 31 | Township |
| Herkimer | 14 | 217 | 221 | 0% | 6 | 36 | Township |
| Beattie | 15 | 201 | 203 | -0.5% | 878 | 0 | City |
| Oketo | 16 | 199 | 202 | 0% | 6 | 35 | Township |
| Noble | 17 | 174 | 177 | 0% | 5 | 35 | Township |
| Elm Creek | 18 | 145 | 150 | -1.36% | 4 | 36 | Township |
| Richland | 19 | 144 | 146 | -0.69% | 4 | 36 | Township |
| Center | 20 | 136 | 136 | -0.73% | 4 | 38 | Township |
| St. Bridget | 21 | 136 | 138 | 0% | 4 | 35 | Township |
| Summerfield | 22 | 123 | 126 | -0.81% | 357 | 0 | City |
| Cottage Hill | 23 | 122 | 123 | 0% | 3 | 36 | Township |
| Wells | 24 | 116 | 117 | 0% | 3 | 38 | Township |
| Blue Rapids | 25 | 76 | 78 | -1.3% | 2 | 36 | Township |
| Balderson | 26 | 75 | 75 | 0% | 2 | 38 | Township |
| Vermillion | 27 | 75 | 78 | -1.32% | 361 | 0 | City |
| Cleveland | 28 | 74 | 74 | 0% | 2 | 36 | Township |
| Oketo | 29 | 61 | 61 | 0% | 592 | 0 | City |
| Clear Fork | 30 | 45 | 43 | 0% | 1 | 36 | Township |
| Bigelow | 31 | 38 | 38 | 0% | 1 | 37 | Township |
Marysville is the largest city in Marshall County, with a population of 3,415.
Bigelow is the smallest city in Marshall County, with a population of 38.
There are 31 cities in Marshall County, Kansas.