Technical Standards

Technical Documentation: Global Postal Code Datasets & CSV Schema

Comprehensive technical specifications for our global postal code datasets. Ensure your systems are configured for our standardized geocoded schema.

Geospatial Data Schema (CSV/XLSX/JSON) & WGS84 Reference Standards

All coordinate data in our repository follows the WGS84 (World Geodetic System 1984) standard. This ensures compatibility with modern GIS software, Google Maps API, and Leaflet.js.

Important: Latitude/longitude values represent approximate centroids of administrative localities (not surveyed points and not property boundaries). The number of decimals reflects formatting, not guaranteed real-world accuracy.

Parameter	Standard	Precision
Coordinates	Decimal Degrees	Up to 6 decimal places
Character Set	UTF-8 (Unicode)	Full international support
ISO Standard	ISO 3166-1 alpha-2	Valid 2-letter codes

Data Accessibility & Search Alignment

To facilitate direct integration and discovery, we prioritize high-intent accessibility across our entire infrastructure:

📄

CSV Formats
Ultra-lightweight

📊

Excel / XLSX
Professional Analysis

JSON

JSON Objects
API-Ready Logic

Our indexing strategy explicitly targets direct search intents (Download, CSV, Excel, geodata) to ensure that technical users find the exact datasets required with zero friction.

Administrative Hierarchy Mapping

To maintain consistency across diverse national structures, we map local divisions to a standardized 4-level hierarchy:

Admin Level 1: State, Province, Region, or Autonomous Community.

Admin Level 2: County, Prefecture, or Department.

Admin Level 3: Municipality or District.

Place Name: The primary locality or town associated with the code.

Versioning & Dataset Maintenance

Datasets are periodically rebuilt and sanity-checked for consistency (schema, hierarchy mapping, and basic geo constraints). Update frequency may vary by country.

For production onboarding, validate delimiter handling, character encoding, null semantics, and numeric coercion before first import. We recommend checksum verification, deterministic column mapping, and idempotent loaders so recurring refreshes can be applied safely with rollback support in case of malformed upstream payloads.

Current snapshot: Version 2026.3 · Updated 2026-03-10. For public change notes, see /updates.