There are 9 post offices under PIN code 121101.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Alipur B.O | Branch Office | Delivery | Ballabgarh | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 2 | Badarpur Syed B.O | Branch Office | Delivery | Ballabgarh | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 3 | Bhainsrawali B.O | Branch Office | Delivery | Ballabgarh | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 4 | Bhuvapur B.O | Branch Office | Delivery | Ballabgarh | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 5 | Chandpur B.O | Branch Office | Delivery | Ballabgarh | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 6 | Faridpur B.O | Branch Office | Delivery | Ballabgarh | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 7 | Kurali B.O | Branch Office | Delivery | Ballabgarh | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 8 | Manjhawali B.O | Branch Office | Delivery | Ballabgarh | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |
| 9 | Tigaon S.O | Sub Office | Delivery | Ballabgarh | Faridabad | Faridabad | Ambala Hq | Haryana | Haryana |