| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Deep River | 1 | 2,080 | 2,051 | 0.19% | 59 | 35 | Township |
| Standish | 2 | 1,697 | 1,682 | 0.18% | 61 | 28 | Township |
| Standish | 3 | 1,447 | 1,460 | -0.14% | 664 | 2 | City |
| Moffatt | 4 | 1,171 | 1,163 | 0.09% | 37 | 31 | Township |
| Sims | 5 | 984 | 982 | 0.1% | 86 | 11 | Township |
| Au Gres | 6 | 955 | 947 | 0.1% | 419 | 2 | City |
| Whitney | 7 | 915 | 907 | 0.22% | 30 | 31 | Township |
| Au Gres | 8 | 890 | 900 | -0.22% | 27 | 33 | Township |
| Arenac | 9 | 869 | 866 | 0% | 24 | 36 | Township |
| Adams | 10 | 548 | 553 | -0.18% | 15 | 36 | Township |
| Turner | 11 | 517 | 516 | 0% | 17 | 31 | Township |
| Sterling | 12 | 451 | 450 | 0% | 462 | 1 | Village |
| Omer | 13 | 282 | 276 | 0.36% | 249 | 1 | City |
| Twining | 14 | 138 | 138 | 0% | 142 | 1 | Village |
| Turner | 15 | 116 | 118 | -0.85% | 113 | 1 | Village |
Deep River is the largest city in Arenac County, with a population of 2,080.
Turner is the smallest city in Arenac County, with a population of 116.
There are 15 cities in Arenac County, Michigan.