The flag of Charles City, Iowa, is a white background with a green-fimbriated blue wavy line. In the center is a white cogwheel with an outline of the Cable-Stayed Pedestrian Bridge inside an orange field. At the bottom of the cogwheel is a black ribbon reading "1854".
2022 NAVA survey[]
The flag reached 118th out of 312 on the 2022 NAVA City Flag Survey, with a score of 4.23 / a C-, behind Butte, and ahead of Mount Dora.