Postal Code F42 - Roscommon, Connacht, Ireland
Postal Code: F42
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 F42 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 Roscommon within the Connacht county or region, located near latitude 53.6333 and longitude -8.1833. Routing follows the structure: Routing Key Area → Local Delivery Unit (Address-Level Identifier). Example mapping: - County/Region: Connacht - Locality: Roscommon - 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 Roscommon, Connacht, Ireland.
Country:
Ireland
State:
Connacht
Area:
Roscommon
Postal Code:
F42
Latitude:
53.6333
Longitude:
-8.1833
Frequently Asked Questions
1. How does F42 work in Ireland?
It identifies both the routing area and the unique delivery point for Roscommon in Connacht.
2. What makes Eircodes unique?
Each Eircode maps to one specific address, improving accuracy and navigation.
3. Can F42 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.