Global Zip Code Lookup

Instantly retrieve city, state/province, county, latitude, longitude, and administrative details for any postal code worldwide.Supports United States (ZIP), United Kingdom (Postcode), Canada, Germany, France, Italy, and many more.

Quick examples:
?? Beverly Hills (90210)
?? New York (10001)
?? London (SW1A 1AA)
?? Ottawa (K1A 0B1)
?? Berlin (10115)
?? Paris (75001)
Live postal data — Queries are processed via our secure backend proxy. No personal data is stored.

What is a Zip Code? History and Modern Importance

The term ZIP Code (Zone Improvement Plan) was introduced by the United States Postal Service (USPS) in 1963. It revolutionised mail sorting by dividing the country into numerical zones. Today, postal codes exist in over 160 countries, each with unique formats: numeric (US, DE, FR), alphanumeric (UK, CA, NL), or even hierarchical systems. A postal code is not just for mail — it serves as a key geographic identifier used in data science, risk assessment, insurance pricing, real estate analytics, emergency response, and targeted marketing. Understanding postal geography is crucial for logistics optimization, fraud detection, and service planning.

How our tool works
We query the official Zippopotam.us API, which aggregates data from national postal services (USPS, Royal Mail, Canada Post, Deutsche Post, etc.). The response includes place names, state codes, latitude/longitude, and optional administrative divisions. For multi-place postal codes (e.g., large ZIP+4 areas), we display every associated locality.

Why Use an Authoritative Zip Code Lookup?

  • Address autocomplete: Validate customer addresses during checkout to reduce shipping errors and improve delivery rates.
  • Geospatial enrichment: Append coordinates to postal data for mapping, route optimization, or demographic analysis.
  • E‑commerce & taxation: Determine sales tax jurisdictions, shipping zones, and service availability based on postal boundaries.
  • Academic & research: Study population density, urban morphology, or accessibility using standardized postal units.
  • Real estate & insurance: Assess risk scores, property valuations, and coverage eligibility by linking postal codes to statistical datasets.

Global Postal Code Formats & Insights

Each country follows distinct postal logic: The United States uses 5-digit ZIP codes (with optional +4 extensions) representing increasingly granular areas. United Kingdom postcodes are alphanumeric (e.g., "SW1A 1AA"), where the first part denotes the postcode area and district. Canada follows a letter-digit pattern (A#A #A#), enabling precise sorting to street segments. Germany uses five-digit postal codes (PLZ) that group delivery areas. France (Code Postal) and Italy (CAP) are strictly numeric. Our tool respects country-specific syntax and returns accurate locality names, states (or provinces), and geographic coordinates as provided by official sources. Where multiple places share a postal code (common in rural areas), every settlement appears in results.

Data accuracy is paramount — we rely on the Open Geography & Postal Data initiative. The API endpoint (api.zippopotam.us) updates periodically from national postal authorities. For developers, this lookup can be integrated into CRM, logistics dashboards, or data pipelines for address cleansing.

Practical Use Cases

  • Shipping & logistics: Automatically detect city/state based on customer-entered zip to reduce manual entry errors.
  • Lead enrichment: Append latitude/longitude to leads for territory mapping and sales automation.
  • Weather & environment: Link postal codes to climate data, air quality indices, or natural hazard zones.
  • Election precincts: Political campaigns use postal codes to segment voter outreach.
Case Study: E‑commerce Fraud Detection

A mid-sized online retailer integrated our zip code lookup API to verify that the billing postal code matches the IP geolocation region. Suspicious mismatches reduced false-positive declines by 18%. By cross-referencing city and state from postal codes, they identified irregular patterns in high-risk orders. The tool's authoritative coordinate data also improved delivery route algorithms, cutting last-mile costs by 7%.

Frequently Asked Questions

Currently we support 30+ countries via the Zippopotam.us database, including US, GB, CA, DE, FR, IT, ES, AU, NL, CH, BE, PT, SE, NO, DK, FI, PL, CZ, AT, CH, IE, NZ, and many more. If your country is not listed, please contact us, and we may expand coverage.

Coordinates are derived from the centroid of the postal area (often the main post office or geographic center). For large ZIP codes (especially rural), the point may not represent the exact street address but provides reliable regional reference. For most applications — city-level mapping, demographic clustering — the accuracy is sufficient.

Yes — many developers implement this API for postcode-to-city lookup. However, for full address validation, we recommend combining with official address databases. This tool gives you the place name, state, and county, which can drastically reduce manual typing.

In many countries, a single postal code may serve several small villages, neighborhoods, or P.O. box zones. The postal authority groups them for efficient delivery. The results will display each distinct locality with its own administrative hierarchy.

No. The service uses the free Zippopotam.us API, which does not require authentication for moderate usage. Please respect fair use. For high-volume applications, consider caching results or using a dedicated geocoding service.

Our data comes directly from national postal authorities via the Zippopotam.us aggregation service. The dataset covers the vast majority of active postal codes in supported countries and is refreshed periodically (typically quarterly). If you encounter a missing or changed postal code, please use the feedback link below — we will verify and help update the source. We also provide a “Report incorrect data” suggestion for community‑driven accuracy improvement.

References & Authority

Our postal data is sourced from official national databases: USPS, Royal Mail (UK), Canada Post, Deutsche Post, La Poste (France), and Poste Italiane. The Zippopotam.us API compiles this open data and refreshes annually. Additionally, geographic coordinates are verified using public domain datasets (GeoNames, Natural Earth). For academic reference, visit the ISO 19160 addressing standard and the Universal Postal Union's postcode systems database.

Updated datasets: May 2026. This tool complies with fair usage policies and does not store any queries. For bulk postal code geocoding, please contact support.

Help improve accuracy: If you find an incorrect or missing postal code, let us know and we will work with data providers to correct it.