Koolaiyar is located in the district of Nagapattinam, Tamil Nadu. The pincode of Koolaiyar is 609113. The area "Koolaiyar" lies under takula of Sirkali and has a Branch Office. Koolaiyar comes under the head office Sirkali. The postal division for pin code 609113 is Mayiladuthurai.
| Area | Koolaiyar |
| Pincode | 609113 |
| Taluka or Tehsil | Sirkali |
| District | Nagapattinam |
| State | Tamil Nadu |
| Office Status | Branch Office |
| Postal Division | Mayiladuthurai |
| Postal Region | Tiruchy |
| Sub Office | Tirumullaivasal |
| Head Office | Sirkali |
| Contact Address | Postmaster, Post Office Koolaiyar (Branch Office), Sirkali, Tamil Nadu, India, Pin Code: 609113 |
| Pin code | Area | District | Taluka | Postal Status |
|---|---|---|---|---|
| 609113 | Koolaiyar pin code | Nagapattinam | Sirkali | Branch Office |
| 609113 | Tirumullaivasal pin code | Nagapattinam | Sirkali | Sub Office |
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