Orathanadu is Taluka (Tehsil) in Thanjavur district of Tamil Nadu state. Orathanadu has 13 areas (postal offices).
| Pin code | Area | District | Taluka | Postal Status |
|---|---|---|---|---|
| 614626 | Cholagankarai PIN Code | Thanjavur | Orathanadu | Branch Office |
| 614902 | Karukadipatti PIN Code | Thanjavur | Orathanadu | Branch Office |
| 614904 | Kasanadupudur PIN Code | Thanjavur | Orathanadu | Branch Office |
| 614904 | Melauluvur PIN Code | Thanjavur | Orathanadu | Sub Office |
| 614625 | Neduvakottai PIN Code | Thanjavur | Orathanadu | Branch Office |
| 614626 | Pappanad PIN Code | Thanjavur | Orathanadu | Sub Office |
| 614626 | Parangivettikadu PIN Code | Thanjavur | Orathanadu | Branch Office |
| 614902 | Sethurayankudikadu PIN Code | Thanjavur | Orathanadu | Branch Office |
| 614905 | Tirumangalakottai PIN Code | Thanjavur | Orathanadu | Branch Office |
| 614905 | Tirumangalakottai Kilayur PIN Code | Thanjavur | Orathanadu | Branch Office |
| 614614 | Tiruvonam PIN Code | Thanjavur | Orathanadu | Sub Office |
| 614614 | Uranipuram PIN Code | Thanjavur | Orathanadu | Branch Office |
| 614628 | Vengarai East PIN Code | Thanjavur | Orathanadu | Branch Office |