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PostalUp
What it is
PostalUp provides ZIP code databases and an address validation API for U.S. address workflows. The API supports standardizing and verifying addresses, geocoding, and bulk processing. PostalUp says its API uses USPS data refreshed monthly; submitted addresses are processed in real time and are not permanently stored except as needed to provide the service or as permitted by its Privacy Policy.
Developers can use API documentation, code examples, a playground, webhooks, a Postman collection, and an OpenAPI specification. Examples or options cover JavaScript, Python, PHP, Ruby, cURL, Go, and Java. Postal data downloads vary by product and include CSV, JSON, Parquet, GeoJSON, and Shapefile, with datasets sourced from USPS, Census, OMB, HUD, and TIGER. Listed use cases include e-commerce, real estate, logistics, marketing, insurance, and healthcare. A free plan includes 1,000 requests; paid API plans start at $29/mo. Annual database plans are also available. Internal commercial use is included with downloads, while customer redistribution requires a license.
For and against
For
- Free plan includes 1,000 requests.
- Supports address standardization, verification, geocoding, and bulk processing.
- Offers examples or options in seven programming languages.
- Download formats include CSV, JSON, Parquet, GeoJSON, and Shapefile.
- Technical support responds within 24 hours.
Against
- Free plan is limited to 1,000 requests.
- No free trial is offered.
- Paid API requests pause after the 20% quota buffer.
- Customer redistribution of downloads requires a license.
The verdict
PostalUp combines address validation APIs with downloadable ZIP code data and developer resources. Check the request limits, database plan details, and redistribution terms against your intended use.
Who it suits
PostalUp suits teams that validate or process U.S. addresses, including e-commerce, logistics, real estate, and other listed industries. Developers can use its API tools and language examples, while data users can choose downloadable formats.
Plans and prices
Free to Try
1,000 requests · 10 requests/min · address standardization · basic validation
Read 7 Oct 2026 · postalup.com
ZIP Code Database Basic
4 core fields · 40,000+ ZIP codes · annual updates · CSV, TSV, JSON, SQL
Read 7 Oct 2026 · postalup.com
Starter
10,000 requests/month · 50 requests/min · ZIP+4 validation · batch processing
Read 7 Oct 2026 · postalup.com
ZIP Code Database Standard
35 fields · coordinates and mapping · monthly updates · dashboard download access
Read 7 Oct 2026 · postalup.com
ZIP Code Database Deluxe
63 fields · population and income data · metro area data · priority email support
Read 7 Oct 2026 · postalup.com
Professional
100,000 requests/month · 200 requests/min · batch and real-time processing · priority support
Read 7 Oct 2026 · postalup.com
ZIP Code Database Business
110 fields · business and employment data · priority email support
Read 7 Oct 2026 · postalup.com
ZIP+4 Database Standard
38 fields · 190M+ addresses covered · 48.7M+ delivery ranges · building coordinates
Read 7 Oct 2026 · postalup.com
Scale
500,000 requests/month · 200 requests/min · batches up to 5,000 addresses · priority support
Read 7 Oct 2026 · postalup.com
On the record
- Address processing
- The terms state that address data submitted for validation is processed in real time and is not permanently stored except as necessary to provide the service or as permitted by the Privacy Policy.postalup.com · read 7 Oct 2026
- API data
- The homepage says its address API uses USPS data refreshed monthly.postalup.com · read 7 Oct 2026
- Company
- The terms identify PostalUp, Inc. and give an Austin, Texas address of 13359 N Highway 183 Suite 406-528, Austin, TX 78750.postalup.com · read 7 Oct 2026
- Data sources
- The downloads page says its datasets are sourced from USPS, Census, OMB, HUD, and TIGER.postalup.com · read 7 Oct 2026
- Developer tools
- The developer page offers API documentation, code examples, an API playground, webhooks, and a Postman collection.postalup.com · read 7 Oct 2026
- Downloads
- PostalUp lists postal data downloads in CSV, JSON, Parquet, GeoJSON, and Shapefile formats, depending on the product.postalup.com · read 7 Oct 2026
- Integrations
- The developer page provides a Postman collection and an OpenAPI specification for working with the API.postalup.com · read 7 Oct 2026
- Languages
- The developer page shows examples or options for JavaScript, Python, PHP, Ruby, cURL, Go, and Java.postalup.com · read 7 Oct 2026
- License
- The downloads page says internal commercial use is included, while redistribution to customers requires a redistribution license.postalup.com · read 7 Oct 2026
- Product
- PostalUp provides ZIP code databases and an address validation API for address standardization, verification, geocoding, and bulk address processing.postalup.com · read 7 Oct 2026
- Support
- The developer page says technical support from its engineering team responds within 24 hours.postalup.com · read 7 Oct 2026
- Usage limit
- The pricing page says paid API plans continue serving requests through a 20% courtesy buffer past the monthly quota, after which requests pause until an upgrade or the monthly reset.postalup.com · read 7 Oct 2026
- Use cases
- The site lists e-commerce, real estate, logistics, marketing, insurance, and healthcare among its use cases.postalup.com · read 7 Oct 2026
