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Random Postal Code Generator

Generate random postal codes for 10 countries including US, UK, Canada, France, Spain, Italy, Germany, Portugal, Netherlands, and Poland

[ Postal Code Generator - Quick Summary ]

What: Generate random postal codes for 10 countries with locale support. Choose real valid codes with city/region data or formatted random numbers.

When to use: International form testing, address validation, database seeding, UI mockups, e-commerce testing.

Example: 90210 (US), SW1A 1AA (UK), K1A 0B1 (Canada), 75001 (France)

Important: For testing only. Supports 10 locales: US, UK, Canada, France, Spain, Italy, Germany, Portugal, Netherlands, Poland.

Our random postal code generator helps you generate random postal codes for testing and development with international locale support. Generate-Random.org provides a free postal code generator that creates valid codes for 10 countries: United States (ZIP codes), United Kingdom (postcodes), Canada, France, Spain, Italy, Germany, Portugal, Netherlands, and Poland. This CSPRNG postal code generator uses cryptographically secure random number generation—perfect for testing international address forms, shipping systems, e-commerce platforms, and location-based applications. Generate up to 100 postal codes instantly with country-specific formatting. Choose between valid real codes with city/region data or random formatted numbers. Supports US ZIP+4, UK alphanumeric postcodes, Canadian postal codes, and more. No signup required, completely free.

What is a Postal Code Generator?

A Postal Code Generator creates random postal codes for multiple countries for testing, development, and educational purposes. Our generator uses cryptographically secure algorithms to ensure truly random codes. You can choose between valid real postal codes from our comprehensive database covering 10 countries, or formatted random numbers for scenarios where exact validity isn't required.

Different countries use different postal code systems: US ZIP codes (5-digit with optional +4 extension), UK postcodes (alphanumeric like SW1A 1AA), Canadian postal codes (alternating letters/numbers like K1A 0B1), and numeric systems in France, Spain, Italy, Germany, Portugal, Netherlands, and Poland. Our generator handles all these formats with authentic city/region mappings for valid mode. For complete international address testing, try our address generator or person generator.

Postal Code Generator Configuration Options

Locale Selection (10 Countries)

Choose from 10 supported locales: en_US (United States), en_GB (United Kingdom), en_CA (Canada), fr_FR (France), es_ES (Spain), it_IT (Italy), de_DE (Germany), pt_PT (Portugal), nl_NL (Netherlands), pl_PL (Poland). Each locale uses authentic country-specific formats.

Mode Selection (Valid / Formatted)

Valid mode returns real postal codes from our comprehensive database with authentic city and region mappings for the selected country. Formatted mode generates random numbers following country-specific format rules, useful when exact validity isn't required for testing.

Format Selection (US Only)

For United States locale only: Standard 5-digit format (XXXXX) or ZIP+4 format (XXXXX-XXXX) with 4 additional digits for precise delivery location. Other countries use their standard formats.

State Filtering (US Valid Mode Only)

When using valid mode with US locale, filter by specific state (AL through WY) or select "All States" for random selection across all 50 states. Perfect for testing US region-specific features.

Quantity (1-100 Postal Codes)

Generate between 1 and 100 postal codes in a single batch for bulk testing, database population, or form validation. Each code is independently generated with full cryptographic randomness.

How to Generate Random Postal Codes

[STEP 1] Select Locale

Choose from 10 supported countries: US, UK, Canada, France, Spain, Italy, Germany, Portugal, Netherlands, or Poland. Each locale uses authentic country-specific postal code formats.

[STEP 2] Choose Mode

Select Valid mode for real postal codes with city/region data, or Formatted mode for random numbers following the locale's format rules. Valid mode is recommended for realistic testing.

[STEP 3] Configure Options (Optional)

For US locale: choose ZIP+4 format and filter by state. Other locales use their standard formats with region-based selection in valid mode.

[STEP 4] Generate & Export

Click EXECUTE GENERATION to create random postal codes. Click individual codes to copy them instantly, or use export options for TXT, CSV, or JSON formats for bulk operations.

Common Use Cases for Random Postal Codes

  • _ International E-commerce Testing - Test multi-country checkout flows, international shipping calculators, and delivery zone validation with postal codes from 10 countries
  • _ Form Validation - Test international address forms, registration pages, and country-specific input validation with valid postal codes from multiple locales
  • _ Database Population - Fill test databases with sample postal codes for multi-region development and staging environments with proper geographic distribution
  • _ International Shipping Testing - Test global logistics software, delivery routing, carrier integrations, and rate calculations across different postal systems
  • _ Location-Based Features - Test international store locators, service area detection, regional availability, and geographic filtering
  • _ Multi-Country Compliance - Test tax calculations, jurisdictional logic, and compliance rules that vary by country and postal code

Technical Details: International Postal Code Generation

Our postal code generator employs cryptographically secure random number generation with support for 10 country locales. Valid mode selects from comprehensive databases of real postal codes with authentic city/region mappings. Formatted mode generates random codes following each country's specific format rules.

// Supported Locales and Formats

en_US (United States):  XXXXX or XXXXX-XXXX (ZIP+4)
en_GB (United Kingdom): AA## #AA (alphanumeric)
en_CA (Canada):         A#A #A# (alternating)
fr_FR (France):         ##### (5-digit)
es_ES (Spain):          ##### (5-digit)
it_IT (Italy):          ##### (5-digit CAP)
de_DE (Germany):        ##### (5-digit Postleitzahl)
pt_PT (Portugal):       ####-### (7-digit with hyphen)
nl_NL (Netherlands):    #### AA (4-digit + 2 letters)
pl_PL (Poland):         ##-### (5-digit with hyphen)

// Database Coverage
en_US: 300+ codes across all 50 states
en_GB: Major UK regions (London, Scotland, Wales, NI, England)
en_CA: All provinces (Ontario, Quebec, BC, Alberta, etc.)
fr_FR: French regions (Île-de-France, PACA, etc.)
es_ES: Spanish regions (Madrid, Cataluña, Andalucía, etc.)
it_IT: Italian regions (Lazio, Lombardia, Campania, etc.)
de_DE: German states (Berlin, Bayern, NRW, etc.)
pt_PT: Portuguese regions (Lisboa, Porto, Algarve, etc.)
nl_NL: Dutch provinces (Noord-Holland, Zuid-Holland, etc.)
pl_PL: Polish voivodeships (Mazowieckie, Małopolskie, etc.)

// Generation Algorithm
For valid mode:
  1. Select locale-specific database
  2. Apply region filter if applicable (US only)
  3. Randomly select from database
  4. Return code with city/region metadata

For formatted mode:
  1. Determine locale format pattern
  2. Generate random digits/letters per pattern
  3. Apply country-specific formatting
  4. Return formatted postal code

Security: NIST SP 800-90A compliant CSPRNG
Standards: Country-specific postal code regulations

API Access for Developers

GET https://generate-random.org/api/v1/generate/zip-codes
VIEW FULL API DOCUMENTATION →

Frequently Asked Questions

How to generate random postal codes for multiple countries?

Use our free international postal code generator supporting 10 countries. Select locale (US, UK, Canada, France, Spain, Italy, Germany, Portugal, Netherlands, Poland), choose mode (valid real codes or formatted random), set quantity (1-100), then click Generate. Valid mode provides real postal codes with authentic city/region mappings—perfect for testing international address forms, shipping systems, e-commerce platforms, and location-based features. Each code uses CSPRNG for true randomness. Export results as TXT, CSV, or JSON for bulk testing. Supports country-specific formats including US ZIP+4, UK alphanumeric postcodes, and Canadian postal codes.

What countries and formats are supported?

We support 10 locales: United States (XXXXX ZIP codes), United Kingdom (SW1A 1AA alphanumeric postcodes), Canada (K1A 0B1 alternating format), France (75001 5-digit), Spain (28001 5-digit), Italy (00118 CAP), Germany (10115 Postleitzahl), Portugal (1000-001 hyphenated), Netherlands (1011 AB 4-digit + letters), and Poland (00-001 hyphenated). Each uses authentic country-specific formatting and real postal codes in valid mode.

What's the difference between valid and formatted modes?

Valid mode returns real postal codes from our comprehensive databases covering 10 countries with authentic city and region mappings. These are actual postal codes used in each country. Formatted mode generates random codes that follow each country's format rules but aren't necessarily real postal codes. Use valid mode for realistic testing and formatted mode when exact validity isn't required.

Can I filter postal codes by region?

Yes for US locale only! In valid mode with US locale (en_US), you can filter by any state (AL through WY) to generate ZIP codes from that specific state. For example, selecting "CA" returns only California codes. Other locales use region-based selection from their databases but without explicit filtering UI.

What is ZIP+4 format and which countries support it?

ZIP+4 is a US-specific extended format that adds 4 digits after a hyphen (XXXXX-XXXX) for precise delivery location. It's only available when US locale (en_US) is selected. Other countries use their standard postal code formats: UK uses alphanumeric (SW1A 1AA), Canada uses alternating letters/numbers (K1A 0B1), Portugal and Poland use hyphenated numeric formats, Netherlands combines digits with letters, and France/Spain/Italy/Germany use 5-digit numeric codes.

Can I use these for testing international shipping systems?

Yes! These postal codes are perfect for testing multi-country e-commerce, international shipping calculators, tax calculations, delivery zone validation, and carrier rate lookups across different postal systems. Each locale provides authentic formatting for realistic testing. For complete international address testing, combine with our address generator which also supports multiple countries.

How are postal codes generated securely?

Our generator uses PHP's random_int() function with CSPRNG (Cryptographically Secure Pseudo-Random Number Generator) to ensure true randomness across all 10 locales. In valid mode, we randomly select from locale-specific databases of real postal codes. In formatted mode, each digit/letter is randomly generated following country-specific rules. This prevents predictable patterns and ensures realistic distribution for all supported countries.

[ HOW TO CITE THIS PAGE ]

APA Style:
Generate-Random.org. (2025). Random Zip Code Generator. Retrieved from https://generate-random.org/zip-codes
Web Citation:
Random Zip Code Generator - Generate-Random.org (https://generate-random.org/zip-codes)