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Boundaries.us is a website that provides boundary coordinate data, primarily for U.S.-focused mapping use cases. The page states that it offers boundary data for U.S. states, counties, and places, and has also added country boundary data. The data is published in CSV format, with each row containing a latitude/longitude coordinate; when a polyline is discontinuous, such as in the case of islands, blank lines are used as separators. This type of data can be used to draw administrative boundaries in web maps, data visualizations, or regional outline displays.
From a developer tooling perspective, Boundaries.us is more of a lightweight geographic data source than a full GIS platform. Its core value lies in providing directly downloadable boundary coordinates, and the page explains that boundaries can be displayed as polylines on Google Maps using PHP. This makes it suitable for developers who already have mapping front-end or server-side scripting capabilities and want a quick integration path. In terms of language and framework support, the page only mentions PHP and a Google Maps example; it does not indicate support for a JavaScript SDK, REST API, GeoJSON, Shapefile, or other standard GIS formats.
For pricing, the page clearly states that the data can be downloaded, modified, and used for free on personal or commercial websites. The data is released under the Creative Commons 4.0 International license, so the barrier to commercial use is relatively low. The integration ecosystem is fairly simple: mainly CSV file downloads, plus a Google Maps/PHP example and PNG map previews. There is no visible API, SDK, bulk sync, version management, update frequency information, service-level support, or data subscription mechanism.
The advantages are its simple data format, free downloads, and clear licensing, making it suitable for quickly building displays of U.S. administrative boundaries. The CSV-per-coordinate format is also easy to parse with scripts. The drawbacks are that the site explicitly provides the information “as is” and does not guarantee accuracy, timeliness, or completeness. Documentation is limited, and it does not provide additional formats or automated interfaces, so serious GIS projects may require extra validation and conversion.
It is suitable for independent developers, website builders, data visualization practitioners, and teams that need low-cost access to U.S. boundary line data or want to draw state and county boundaries on Google Maps. There is no information in the page about access from China, so this is unknown. In addition, Google Maps often faces network availability issues in mainland China, so real-world projects may want to consider alternative data sources such as OpenStreetMap, Natural Earth, US Census TIGER/Line, or GADM.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on boundaries.us official site.
boundaries.us is an United States API & Data provider. TG4G tracks its product information, an overall rating of 7.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach boundaries.us directly.