São Tomé e PrÃncipe
Classification (as of 14 October 2026): A — No national postcode or addressing system in use
São Tomé and PrÃncipe has no national postcode system; addresses are described by locality and district.
World Bank estimate: 30.8% of the population lived in rural areas in 2025.
Sources
WIA Pin Code turns GPS coordinates into a 12-digit code (XXX-XXX-XXX-XXX) for any point on Earth. Each code identifies a cell of about 20 m north–south × 40 m east–west at the equator (narrower towards the poles). The first nine digits are the earlier v1 code, so existing v1 codes remain the prefix of the new code. The code is calculated from coordinates alone, so conversion works without an internet connection (maps and search need one). It is free for governments and individuals, and is meant to complement, not replace, São Tomé and PrÃncipe's own addresses, postcodes and address systems.
function yujinTransform(lat, lng) {
const latStr = String(Math.floor(((lat + 90) / 180) * 999999)).padStart(6, '0');
const lngNorm = (lng + 180) / 360;
const lngBase = Math.floor(lngNorm * 999);
const lngSub = Math.floor((lngNorm * 999 - lngBase) * 1000);
return latStr.slice(0,3) + '-' + latStr.slice(3,6) + '-' + String(lngBase).padStart(3,'0') + '-' + String(lngSub).padStart(3,'0');
}
// Full specification: /docs/yujin-transform.html
WIA Pin Code proposal documents for São Tomé and PrÃncipe
Free for governments and citizens. $999/month for enterprise integration.
Contact Us