There are 8 post offices under PIN code 121001.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Factory Area Faridabad S.O | Sub Office | Non-Delivery | Faridabad | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 2 | Faridabad NIT H.O | Head Office | Delivery | Faridabad | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 3 | Feroz Gandhi Nagar Faridabad S.O | Sub Office | Non-Delivery | Faridabad | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 4 | Industrial Area Faridabad S.O | Sub Office | Non-Delivery | Faridabad | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 5 | N.I.F.M. Faridabad S.O | Sub Office | Non-Delivery | Faridabad | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 6 | Nh-2 Faridabad S.O | Sub Office | Non-Delivery | Faridabad | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 7 | Nh-3 Faridabad S.O | Sub Office | Non-Delivery | Faridabad | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 8 | Nh-4 Faridabad S.O | Sub Office | Non-Delivery | Faridabad | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |