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License information is collected from each state by the Analyst Resource Center (ARC) and available for download on CareerOneStop. States are expected to submit revisions every two years, and new information is updated on CareerOneStop every 4-6 months as new information is received. Information includes license titles, authorizing organizations, descriptions of licenses, and O*NET codes. Please note that not all states submit license information and there is no way to guarantee that each state collects all of the license information for their state. License information is available in Microsoft Access format.
See this data in use with the License Finder where you can also filter and download a subset of the data: https://www.careeronestop.org/Toolkit/Training/find-licenses.aspx
Download current dataset, flat or tall versions: https://data.widcenter.org/wfinfodb/License
Data download file technical details: LicensedOccupations_DataDownloadReadme.docx
API: Available as an API. https://www.careeronestop.org/Developers/WebAPI/web-api.aspx
Widget: Available as a Widget. https://www.careeronestop.org/Developers/LinkToUs/link-to-us.aspx