World Postal Code Lookup

📖 Tool Introduction

World Postal Code Lookup covers 1.8M+ records from the GeoNames postal code database across 152 countries, plus 2,879 China district-level rows. Reverse-lookup by code, forward-lookup by place name, or pinpoint a Chinese district by its division code.

Postal codes come up whenever you fill in a courier slip, send international mail or check a delivery address. Pick the country, type a place or a code, and both directions work at once. Not sure how a foreign place is spelled? The romanized column can be copied directly.

Built-in format checks cover the main countries: if your input does not match the expected pattern, a hint is shown first and the query still runs. Countries without a built-in rule are not restricted.

The tool is ready to use with no download at all; queries are answered instantly through the site API and only matching postal records are returned.

📖 Key Features

• 152 countries, 1.8M+ postal records (GeoNames, CC-BY 4.0), plus 2,879 China district rows
• Three modes: reverse lookup by code (exact first, then prefix), fuzzy search by place name, exact match by Chinese division code
• Transliterated index: Cyrillic, Korean, Greek and kana names are pre-romanised, so Latin input finds them
• Pinyin searchable: China districts match pinyin, case-insensitively, spaces ignored — dongcheng and Dong Cheng both work
• Country selector sorted in your language; the division-code mode disables itself for non-China picks
• Format hints for major countries; no restriction where no rule is built in
• One code covering several areas (even across borders) lists every match, separated by country and state
• Ready to use: no download needed, queries answered instantly through the site API

📖 How to Use

1. Pick a country in the dropdown, or keep "All countries" for a worldwide search
2. Choose a mode: by code, by place name, or by division code (China / all countries only)
3. Type a code, a place, pinyin or a division code and press search, or hit Enter
4. Results are split into country, code, place, state, city, county and romanized columns; a single hit shows a breadcrumb path above
5. Copy result puts the path and stats on your clipboard

📖 Things to Note

• Data source: Worldwide codes come from GeoNames (CC-BY 4.0); the 2,879 China district rows are compiled from published administrative data
• Server-side query: The database is opened read-only, so no query can ever modify it; the API is not cached and always returns fresh results
• Worldwide search is slow: Searching names with no country selected scans all 1.8M rows, so pick a country first; code searches use an index and are fast
• One code, several areas: A code often covers neighbouring areas, sometimes in more than one country. Use the country and state columns to decide; results are capped at 300
• Division codes: The six-digit division code maps only to China districts; the option disables itself for other countries
• Privacy: Queries are answered in real time through the site API and only matching postal records are returned