| Locality | Post Code |
|---|---|
| Allisona, Williamson | 37046 |
| Arrington, Williamson | 37014 |
| Bethesda, Williamson | 37046 |
| Brentwood, Williamson | 37027 |
| College Grove, Williamson | 37046 |
| Fairview, Williamson | 37062 |
| Forest Hills, Williamson | 37027 |
| Franklin, Williamson | 37064, 37067, 37069 |
| Kingfield, Williamson | 37064 |
| Nolensville, Williamson | 37135 |
| Peytonsville, Williamson | 37064 |
| Primm Springs, Williamson | 38476 |
| Rudderville, Williamson | 37064 |
| Thompsons Station, Williamson | 37179 |
| Triune, Williamson | 37014 |