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List Post Code

List Post Code

A global postal code directory providing comprehensive listings of postal codes for countries worldwide, making address validation simple and efficient.

Overview

List Post Code is a global postal code directory covering countries worldwide. It helps businesses, e-commerce platforms, and developers validate addresses, reduce shipping errors, and improve delivery accuracy across international markets.

The challenge

Postal code formats and coverage vary significantly by country. Businesses shipping internationally need a reliable way to validate addresses and lookup postal codes. Existing resources were fragmented, outdated, or limited to specific regions.

Our approach

We built a multi-country postal code platform with search, browse, and API capabilities. The database supports varying formats and update cycles per country. The interface is fast and intuitive, with country-specific pages and search optimized for each region.

Results

  • Useful resource for international address validation
  • Supports businesses and developers across multiple countries
  • Helps reduce shipping errors and improve delivery times
  • Scalable structure for adding new countries

Key features

  • ✓Coverage of postal codes for countries worldwide
  • ✓Search and browse by country and region
  • ✓Handles varying formats and regional systems
  • ✓Fast performance across large datasets

Timeline

Start date

2022

End date

Ongoing

Technologies used

Next.jsReactTypeScriptTailwind CSSPostgreSQL

Experience & outcome

List Post Code has become a useful resource for businesses and developers needing postal code validation across multiple countries. The platform supports international address lookup and helps users reduce shipping errors and improve delivery times.

Challenges faced

Aggregating and maintaining postal code data for numerous countries with varying formats and update frequencies. Ensuring fast search performance across different datasets. Handling the complexity of countries that have multiple postal code systems or regional variations.

Performance

Mobile— 98
PageSpeed MobileView full report
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