ZipCheckup VS ZIP Code API

• Simple ZIP-code lookup
  The name and URL suggest you enter a ZIP code and get location-specific results right away, without creating an account or doing complex setup. I could not verify the site's current features, so confirm this on the site.
• Fast, easy to understand results
  Tools like this usually turn technical public data into a short, readable summary. That helps non-experts such as homeowners, renters and parents get a quick overview. Check that the site actually does this.
• Likely based on public data
  Services of this type usually draw on government or public datasets, such as EPA water-quality records. That can make the information more credible than anecdotal sources. Verify which sources ZipCheckup cites.
• Free to access (probably)
  Lookup tools like this are often free or ad-supported for basic use, which makes them a low-cost way to do preliminary research. Confirm the current pricing on the site.
• Useful starting point for research
  It can help you spot potential concerns in your area and decide whether to follow up with testing, local utilities or other official sources.

• Comprehensive ZIP Code Data
  The ZIP Code API from zip-codes.com provides extensive data including ZIP code details, city information, state data, and geographic coordinates, making it a thorough resource for location-based lookups.
• Multiple Lookup Options
  The API supports various types of lookups including ZIP code to city/state, city/state to ZIP code, distance calculations between ZIP codes, and radius searches, offering flexible querying capabilities.
• Easy Integration
  The API uses standard REST-based HTTP requests and returns data in commonly used formats like JSON and XML, making it straightforward to integrate into most applications and programming languages.
• Distance and Radius Calculations
  The API includes built-in functionality for calculating distances between ZIP codes and finding ZIP codes within a specified radius, which is valuable for store locators, shipping estimates, and proximity-based features.
• Well-Documented Endpoints
  The API provides clear documentation for its various endpoints and parameters, helping developers understand available features and implement them correctly without extensive trial and error.

• I Built a 278,000-Page Website From Federal Data for $5/Month

  I spent the last few months stitching it all together into one site. ZipCheckup. Type in a ZIP code, get a full home safety profile. 278,000 pages. 50+ data sources. Running on $5/month. - Source: dev.to / 6 months ago

Tracking ZIP Code API since May 2026.