| Locality | Post Code |
|---|---|
| Aureola, Floyd | 50653 |
| Charles City, Floyd | 50616 |
| Colwell, Floyd | 50620 |
| Dougherty, Floyd | 50433 |
| Floyd, Floyd | 50435 |
| Greene, Floyd | 50636 |
| Maple Heights, Floyd | 50616 |
| Marble Rock, Floyd | 50653 |
| Nashua, Floyd | 50658 |
| Nora Springs, Floyd | 50458 |
| Oakwood, Floyd | 50653 |
| Orchard, Floyd | 50460 |
| Rockford, Floyd | 50468 |
| Rudd, Floyd | 50471 |