Calamus to Cylinder
(Click a column header to sort)
| City | Population |
| Calamus | 394 |
| Callender | 424 |
| Calmar | 1,058 |
| Calumet | 181 |
| Camanche | 4,215 |
| Cambridge | 819 |
| Cantril | 257 |
| Carbon | 28 |
| Carlisle | 3,497 |
| Carpenter | 130 |
| Carroll | 10,098 |
| Carson | 668 |
| Carter Lake | 3,248 |
| Cascade | 1,958 |
| Casey | 478 |
| Castalia | 175 |
| Castana | 178 |
| Cedar Falls | 36,145 |
| Cedar Rapids | 120,758 |
| Center Junction | 131 |
| Center Point | 2,007 |
| Centerville | 5,924 |
| Central City | 1,157 |
| Centralia | 101 |
| Chariton | 4,573 |
| Charles City | 7,812 |
| Charlotte | 421 |
| Charter Oak | 530 |
| Chatsworth | 89 |
| Chelsea | 287 |
| Cherokee | 5,369 |
| Chester | 151 |
| Chillicothe | 90 |
| Churdan | 418 |
| Cincinnati | 428 |
| Clare | 190 |
| Clarence | 1,008 |
| Clarinda | 5,690 |
| Clarion | 2,968 |
| Clarksville | 1,441 |
| Clayton | 55 |
| Clear Lake | 8,161 |
| Clearfield | 371 |
| Cleghorn | 250 |
| Clemons | 148 |
| Clermont | 716 |
| Clinton | 27,772 |
| Clio | 91 |
| Clive | 14,125 |
| Clutier | 229 |
| Coburg | 31 |
| Coggon | 745 |
| Coin | 252 |
| Colesburg | 412 |
| Colfax | 2,223 |
| College Springs | 246 |
| Collins | 499 |
| Colo | 868 |
| Columbus City | 376 |
| Columbus Junction | 1,900 |
| Colwell | 76 |
| Conesville | 424 |
| Conrad | 1,055 |
| Conway | 63 |
| Coon Rapids | 1,305 |
| Coppock | 57 |
| Coralville | 17,269 |
| Corning | 1,783 |
| Correctionville | 851 |
| Corwith | 350 |
| Corydon | 1,591 |
| Cotter | 48 |
| Coulter | 262 |
| Council Bluffs | 61,324 |
| Craig | 102 |
| Crawfordsville | 295 |
| Crescent | 537 |
| Cresco | 3,905 |
| Creston | 7,597 |
| Cromwell | 120 |
| Crystal Lake | 285 |
| Cumberland | 281 |
| Cumming | 162 |
| Curlew | 62 |
| Cushing | 246 |
| Cylinder | 110 |
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