There are 27 post offices under PIN code 123001.
| Post Office | Office Type | Delivery Status | Taluk | District | Division | Region | State | Circle | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Azamabad Mukhota B.O | Branch Office directly a/w Head Office | Delivery | Azamabad Mukhota | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 2 | Barkoda B.O | Branch Office directly a/w Head Office | Delivery | Barkoda | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 3 | Bashirpur B.O | Branch Office directly a/w Head Office | Delivery | Bashirpur | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 4 | Bhushan Kalan B.O | Branch Office directly a/w Head Office | Delivery | Bhushan Kalan | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 5 | Chillro B.O | Branch Office directly a/w Head Office | Delivery | Chillro | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 6 | Dhanota B.O | Branch Office directly a/w Head Office | Delivery | Dhanota | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 7 | Dharson B.O | Branch Office directly a/w Head Office | Delivery | Dharson | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 8 | Dhor Kalan B.O | Branch Office directly a/w Head Office | Delivery | Dhor Kalan | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 9 | Dochana B.O | Branch Office directly a/w Head Office | Delivery | Dochana | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 10 | Dublana B.O | Branch Office directly a/w Head Office | Delivery | Narnaul | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 11 | Hamidpur B.O | Branch Office directly a/w Head Office | Delivery | Hamidpur | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 12 | Hudina B.O | Branch Office directly a/w Head Office | Delivery | Hudina | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 13 | Kamania B.O | Branch Office directly a/w Head Office | Delivery | Kamania | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 14 | Kanwi B.O | Branch Office directly a/w Head Office | Delivery | Kanwi | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 15 | Karota B.O | Branch Office directly a/w Head Office | Delivery | Karota | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 16 | Koriawas B.O | Branch Office directly a/w Head Office | Delivery | Koriawas | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 17 | Krishan Nagar B.O | Branch Office directly a/w Head Office | Delivery | Krishan Nagar | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 18 | Kultazpur B.O | Branch Office directly a/w Head Office | Delivery | Kultazpur | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 19 | Madhana Kalan B.O | Branch Office directly a/w Head Office | Delivery | Madhana Kalan | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 20 | Mandi B.O | Branch Office directly a/w Head Office | Delivery | Mandi | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 21 | Mini Sectt.Narnaul S.O | Sub Office | Non-Delivery | Narnaul | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 22 | Nangal Katha B.O | Branch Office directly a/w Head Office | Delivery | Nagal Katha | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 23 | Narnaul City S.O | Sub Office | Non-Delivery | Narnaul | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 24 | Narnaul H.O | Head Office | Delivery | Civil Line | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 25 | Narnaul Kty. S.O | Sub Office | Non-Delivery | Narnaul | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 26 | Neerpur B.O | Branch Office directly a/w Head Office | Delivery | Neerpur | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |
| 27 | Nizampur R.S. B.O | Branch Office directly a/w Head Office | Non-Delivery | Nizampur R.S. | Mahendragarh | Gurgaon | Ambala Hq | Haryana | Haryana |