Service Territory
Grayson County
| Incorporated Cities served by Oncor in Grayson County: | Dispatch Center |
| Bells | Texoma - (TXA) |
| Collinsville | Texoma - (TXA) |
| Denison | Texoma - (TXA) |
| Dorchester | Texoma - (TXA) |
| Gunter | Texoma - (TXA) |
| Howe | Texoma - (TXA) |
| Pottsboro | Texoma - (TXA) |
| Sadler | Texoma - (TXA) |
| Sherman | Texoma - (TXA) |
| Southmayd | Texoma - (TXA) |
| Van Alstyne | Texoma - (TXA) |
For a list of zip codes served by Oncor, click here.