About this API
The data is served by the data.colorado.gov open-data portal, which runs on the Socrata platform. The SODA REST endpoint returns JSON (optionally CSV or GeoJSON) and supports the SoQL query language — filtering with $where, sorting with $order and paging with $limit and $offset. Each record includes fields such as the entity id (entityid), name, status (e.g. Good Standing, Delinquent), type, principal and mailing addresses and registered-agent details. Access is keyless and the server sends an open CORS header, so queries can run directly from the browser.
Frequently asked questions
Do I need an API key?
No. The endpoint is fully open — you can query it without registration or an API key. Socrata offers an optional free app token for very high request volumes, but it is not required for normal use.
What data does this API return?
It returns records of business entities registered in Colorado: entity id (entityid), name, status (e.g. Good Standing, Delinquent), entity type, principal and mailing addresses, registered-agent details and the formation date. The dataset covers corporations, LLCs and other entities on the register since 1864.
Can this API be called directly from a browser?
Yes. The server returns an Access-Control-Allow-Origin: * header, so requests work directly from front-end code in the browser — which is why this page has a working "Try it" button.
Who runs this API?
The register is maintained by the Colorado Secretary of State (Colorado Department of State, CDOS). The data is published on the data.colorado.gov open-data portal, which runs on the Socrata platform.