319 Area Code has 415 prefixes
| Prefix | Primary City | Carrier |
|---|---|---|
| 319-935 | Winthrop | East Buchanan Telephone Cooperative |
| 319-936 | Iowa City | Iowa Wireless Services, Lp |
| 319-937 | Mediapolis | Mediapolis Telephone Co. |
| 319-938 | Rowley | Windstream Iowa Communications, Inc. |
| 319-939 | Cedar Rapids | United States Cellular Corp. - Iowa |
| 319-961 | Waterloo | Iowa Wireless Services, Lp |
| 319-981 | Cedar Rapids | Iowa Wireless Services, Lp |
| 319-983 | Cedar Rapids | Qwest Corporation |
| 319-984 | Cedar Rapids | Qwest Corporation |
| 319-985 | Mediapolis | Mediapolis Telephone Co. |
| 319-986 | Mount Pleasant | Windstream Iowa Communications, Inc. |
| 319-987 | Janesville | Windstream Iowa Communications, Inc. - Systems |
| 319-988 | Cedar Rapids | Qwest Corporation |
| 319-989 | Dike | Qwest Corporation |
| 319-999 | Cedar Rapids | Atkins Telephone Company, Inc. - Ia |