| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Clara | city | Iowa | United States | 41.35 | -95.90 | 987 | |
| Clare | city | Iowa | United States | 42.59 | -94.35 | 1213 | |
| Clarence | city | Iowa | United States | 41.89 | -91.06 | 889 | |
| Clarinda | city | Iowa | United States | 40.74 | -95.04 | 1046 | |
| Clarinda Junction (historical) | city | Iowa | United States | 40.93 | -95.00 | 1049 | |
| Clarion | city | Iowa | United States | 42.73 | -93.73 | 1164 | |
| Clark | city | Iowa | United States | 40.95 | -95.54 | 1085 | |
| Clarkdale | city | Iowa | United States | 40.79 | -92.90 | 898 | |
| Clarkson (historical) | city | Iowa | United States | 41.33 | -93.45 | 895 | |
| Clarksville | city | Iowa | United States | 42.78 | -92.67 | 938 | |
| Clay Mills | city | Iowa | United States | 42.18 | -90.94 | 830 | |
| Clayton | city | Iowa | United States | 42.90 | -91.15 | 971 | |
| Clayton Center | city | Iowa | United States | 42.88 | -91.33 | 958 | |
| Clear Creek Mobile Home Park | city | Iowa | United States | 41.70 | -91.66 | 830 | |
| Clear Lake | city | Iowa | United States | 43.14 | -93.38 | 1236 | |
| Clearfield | city | Iowa | United States | 40.80 | -94.48 | 1669 | |
| Cleghorn | city | Iowa | United States | 42.81 | -95.71 | 1669 | |
| Clemons | city | Iowa | United States | 42.11 | -93.16 | 941 | |
| Clermont | city | Iowa | United States | 43.00 | -91.65 | 892 | |
| Cleves | city | Iowa | United States | 42.47 | -93.05 | 1069 | |
| Cliffland | city | Iowa | United States | 40.97 | -92.33 | 830 | |
| Climax | city | Iowa | United States | 40.93 | -95.37 | 1043 | |
| Climbing Hill | city | Iowa | United States | 42.34 | -96.08 | 1207 | |
| Clinton | city | Iowa | United States | 41.84 | -90.19 | 830 | |
| Clinton Center | city | Iowa | United States | 40.61 | -93.38 | 1040 | |
| Clinton Stock Yards | city | Iowa | United States | 41.82 | -90.22 | 830 | |
| Clio | city | Iowa | United States | 40.64 | -93.45 | 1115 | |
| Clive | city | Iowa | United States | 41.60 | -93.72 | 846 | |
| Cloud | city | Iowa | United States | 41.17 | -93.24 | 895 | |
| Cloverdale | city | Iowa | United States | 43.35 | -95.69 | 1669 | |
| Clucas | city | Iowa | United States | 41.50 | -94.05 | 944 | |
| Clutier | city | Iowa | United States | 42.08 | -92.40 | 875 | |
| Clyde | city | Iowa | United States | 41.84 | -93.27 | 948 |