- PIN code
- 581121
- Main post office
- Castlerock (sub office)
- District
- Uttara Kannada
- State
- Karnataka
- Postal division
- Sirsi
- Region and circle
- North Karnataka Region, Karnataka circle
- Delivery
- Delivery PIN (2 of 2 offices deliver)
- Location
- Open on a map (12.616, 74.835)
Post offices with PIN 581121
| Post office | Type | Delivery |
|---|---|---|
| Castlerock | Sub office | Delivers mail |
| Bazarkunang | Branch office | Delivers mail |
581121 covers 0 head offices, 1 sub office and 1 branch office.
What the digits of 581121 mean
- 5: India Post's Southern region, which covers Andhra Pradesh, Karnataka, Puducherry and Telangana (3,313 PINs).
- 58: the Karnataka postal circle; 451 PINs start with 58.
- 581: the sorting district, shared by 118 PINs in 3 districts.
- 121: the delivery post office within it, Castlerock.
Head post office for 581121
The post offices with this PIN belong to the Sirsi postal division, whose head office is listed below. Money orders, savings accounts and complaints that a sub or branch office cannot settle go to the head office.
- Sirsi head post office: 581401
Nearby PIN codes in Uttara Kannada
- Jagalbet581129
- Joida581186
- Kumbarwada581187
- Karwar581301
- Karwar Baitkhol581302
- Kodibag581303
- Nandangadda581304
- Habbuwada581306
All 75 PIN codes in Uttara Kannada
Writing an address with 581121
Put the PIN on the last line, after the town and state, so the sorting machines and postmen can read it:
Name House number, street Castlerock post office Uttara Kannada, Karnataka – 581121
Frequently asked questions
Which post office has PIN code 581121?
2 post offices share it: Castlerock and Bazarkunang, in Uttara Kannada district, Karnataka.
Is 581121 a delivery PIN code?
Yes. All 2 of its post offices deliver mail; letters addressed to 581121 are delivered.
Which district is 581121 in?
Uttara Kannada district, Karnataka. It is in the Sirsi postal division (North Karnataka Region) of the Karnataka postal circle.
What is the head post office for 581121?
The Sirsi postal division's head office is Sirsi (581401).
Sources
Last checked on 6 October 2026. PIN codes and post offices are from India Post’s directory on data.gov.in. Post offices are sometimes opened, merged or renamed; check with India Post before relying on a PIN for an official form.