Postal Code F91 - Sligo, Connacht, Ireland
Postal Code: F91
Postal System Details
Postal Authority
An Post
Postal System
Eircode (seven-character alphanumeric: A65 B2CD)
Region Structure
Routing Key Area → Local Delivery Unit (Unique Address Identifier)
Area Information
The postal code F91 corresponds to Ireland’s Eircode system, administered by An Post, the national postal authority of Ireland. Eircodes follow a seven-character alphanumeric format such as A65 B2CD (illustrative only). The first three characters, known as the Routing Key, represent a broad geographic area. The remaining four characters form a Unique Identifier that pinpoints each individual address. This code applies to Sligo within the Connacht county or region, located near latitude 54.2697 and longitude -8.4694. Routing follows the structure: Routing Key Area → Local Delivery Unit (Address-Level Identifier). Example mapping: - County/Region: Connacht - Locality: Sligo - Routing Key: Derived from the first three characters - Unique Identifier: Based on last four characters This page follows Eircode routing principles published by An Post. All examples are illustrative. For accurate delivery, the full seven-character Eircode must match the intended address in Sligo, Connacht, Ireland.
Country:
Ireland
State:
Connacht
Area:
Sligo
Postal Code:
F91
Latitude:
54.2697
Longitude:
-8.4694
Frequently Asked Questions
1. How does F91 work in Ireland?
It identifies both the routing area and the unique delivery point for Sligo in Connacht.
2. What makes Eircodes unique?
Each Eircode maps to one specific address, improving accuracy and navigation.
3. Can F91 verify an address in Ireland?
Yes—if the full seven-character code matches the building-level identifier.
4. Which authority manages postal codes in Ireland?
An Post oversees the national Eircode routing system.