| # | Village / Locality | Post Office | PIN Code | Sub District | Type |
|---|---|---|---|---|---|
| 2001 | ODAMEDU | Talguni BO | 📍 638456 | Gobichettipalayam | Branch Post Office |
| 2002 | ODAMEDU | Theethampalayam BO | 📍 638456 | Gobichettipalayam | Branch Post Office |
| 2003 | ODAMEDU | Perumugaipudur BO | 📍 638505 | Gobichettipalayam | Branch Post Office |
| 2004 | ODAN THOTTAM PUDUR | Theethampalayam BO | 📍 638456 | Gobichettipalayam | Branch Post Office |
| 2005 | ODANILAI | Kasthurbagarm BO | 📍 638101 | Erode | Branch Post Office |
| 2006 | ODATHALAM PATHI | Vallipuram BO | 📍 638103 | Erode | Branch Post Office |
| 2007 | Odathurai | Odathurai BO | 📍 638455 | Bhavani | Branch Post Office |
| 2008 | ODAYA GOUNDAN PALAYAM | Odayagoundenpalayam BO | 📍 638454 | Gobichettipalayam | Branch Post Office |
| 2009 | Odayagoundanpalayam | Kasipalayam SO Erode | 📍 638454 | Gobichettipalayam | Post Office - PO |
| 2010 | Odayagoundanpalayam | Odayagoundenpalayam BO | 📍 638454 | Gobichettipalayam | Branch Post Office |
| 2011 | Oddapalayam | Olagadam SO | 📍 638314 | Bhavani | Post Office - PO |
| 2012 | Oddarur | Uthandiyur BO | 📍 638402 | Sathyamangalam | Branch Post Office |
| 2013 | OLA PALAYAM | Mullampatti BO | 📍 638107 | Perundurai | Branch Post Office |
| 2014 | OLAGADAM | Olagadam SO | 📍 638314 | Bhavani | Post Office - PO |
| 2015 | OLAGAPPA GOUNDAN PUDUR | Kaliappampalayam BO | 📍 638110 | Perundurai | Branch Post Office |
| 2016 | OLAGAPPAGOUNDEN PUDUR | Kaikolapalayam BO | 📍 638056 | Perundurai | Branch Post Office |
| 2017 | OLAITHUNDU | Periavattam BO | 📍 638151 | Erode | Branch Post Office |
| 2018 | Olakkaran palayam | Periakallipatti BO | 📍 641302 | Sathyamangalam | Branch Post Office |
| 2019 | Olalakovil | Olalakoil BO | 📍 638460 | Gobichettipalayam | Branch Post Office |
| 2020 | OLAPALAYAM | Olapalayam BO | 📍 638052 | Perundurai | Branch Post Office |
| 2021 | OLAPALAYAM | Modakurichi SO | 📍 638104 | Erode | Post Office - PO |
| 2022 | OLAPALAYAM | Pattimaniakaranpalayam BO | 📍 638462 | Gobichettipalayam | Branch Post Office |
| 2023 | OLAPPALAYAM | Vilakethi BO | 📍 638109 | Erode | Branch Post Office |
| 2024 | OLAPPALAYAM | Punjaipalatholuvu BO | 📍 638751 | Perundurai | Branch Post Office |
| 2025 | OLAVAR KADU | Vadakuthaiyurpalayam BO | 📍 638102 | Erode | Post Office - PO |
| 2026 | OLD KADAYAMPATTI | Kadayampatti BO | 📍 638312 | Bhavani | Branch Post Office |
| 2027 | OLD THOTTI PALAYAM | Getticheyur SO | 📍 638110 | Gobichettipalayam | Post Office - PO |
| 2028 | OLD VEERANAMPALAYAM | Seenapuram BO | 📍 638057 | Perundurai | Branch Post Office |
| 2029 | Om Sakthi nagar | Madampalayam BO | 📍 638459 | Sathyamangalam | Branch Post Office |
| 2030 | ONAKKUTTAI | AnjanurVemandampalayam BO | 📍 638462 | Gobichettipalayam | Branch Post Office |
| 2031 | ONANKATTU VALASU | Pallapalayam BO | 📍 638116 | Perundurai | Branch Post Office |
| 2032 | ONDIKARAN PALAYAM | Vilarasampatti BO | 📍 638107 | Erode | Branch Post Office |
| 2033 | ONDIYUR | Satamugai BO | 📍 638503 | Sathyamangalam | Branch Post Office |
| 2034 | ONG PALAYAM | Odathurai BO | 📍 638455 | Bhavani | Branch Post Office |
| 2035 | ONNAKARAI | Bargur-Anthiyur BO | 📍 638501 | Bhavani | Branch Post Office |
| 2036 | ONNAM PALLAM | Ramanathapuram Pudur BO | 📍 638005 | Erode | Branch Post Office |
| 2037 | ONTHANAI | Thamaraikarai BO | 📍 638501 | Bhavani | Branch Post Office |
| 2038 | OOSIPALAYAM | Veerappampalayam BO | 📍 638101 | Erode | Branch Post Office |
| 2039 | OPPILIANUR INDRA NAGAR | Umareddiyur BO | 📍 638311 | Bhavani | Branch Post Office |
| 2040 | ORATHU PALAYAM | Ramalingapuram South BO | 📍 638051 | Erode | Branch Post Office |
| 2041 | ORATHU PALAYAM HAIJANA COLONY | Ramalingapuram South BO | 📍 638051 | Erode | Branch Post Office |
| 2042 | Orathupalayam | Ramalingapuram BO | 📍 638051 | Perundurai | Branch Post Office |
| 2043 | Oricheri | Oricheri BO | 📍 638315 | Bhavani | Branch Post Office |
| 2044 | ORICHERI COLONY | Oricheri BO | 📍 638315 | Bhavani | Branch Post Office |
| 2045 | ORICHERIPUDUR | Oricheri BO | 📍 638315 | Bhavani | Branch Post Office |
| 2046 | ORUKUTTAI THOTTAM | Nichampalayam BO | 📍 638055 | Gobichettipalayam | Branch Post Office |
| 2047 | ORVICHANI AGRAHARAM | Dalavoipettai BO | 📍 638312 | Bhavani | Branch Post Office |
| 2048 | OSAIPATTI | Pethampalayam BO | 📍 638116 | Perundurai | Branch Post Office |
| 2049 | OSAIPATTI | Vellalapalayam BO | 📍 638315 | Gobichettipalayam | Branch Post Office |
| 2050 | OSAPALAYAM | Kalkadambur BO | 📍 638503 | Sathyamangalam | Branch Post Office |