# Colorado License Lookup

> https://colorado-license-lookup.com

## What this site answers

One query, one record. Key: **a Colorado license number, or a licensee's name**.
Format: ^[0-9]{1,10}$
Entities: 597451

## Source

- Origin: Professional and Occupational Licenses — Colorado Department of Regulatory Agencies
- URL: https://data.colorado.gov/d/7s5z-vewr
- Last collected: 2026-08-20
- Re-use: Public domain (data.colorado.gov).

## Access points

Every HTML page has a Markdown twin at the same path with the `.md` extension. Example: `/renewal/` -> `/renewal.md`. Links inside the Markdown files already point to the twins.

Search index, served as JSON with open CORS:

- `/i/l/<license number>.json` — exact match on the number
- `/i/n/<first three letters of the name>.json` — dense name shard
- `/i/n2/<first two letters>.json` — fallback bucket
- `/i/dico.json` — shape of an index entry
- `/i/etats.json` — the states present
- `/sitemap.xml` — every page

These paths are **version 1** and will not change without notice. Bulk access, an availability guarantee or a change feed goes through `/pro/`.

Indexable pages: 922

## What this site is NOT

- This is not the official register and does not replace consulting it.
- Holding a licence is the minimum legal requirement, not a quality mark.
- Colorado, USA. Practising a regulated profession without a current license is unlawful; DORA publishes this register for the public to check.
- ⚠️ A COLORADO LICENCE NUMBER IS UNIQUE ONLY WITHIN ITS LICENCE TYPE. Number 1 is held by dozens of people in different professions. The key is TYPE-number. Joining on the number alone merges unrelated people into one record.
- ⚠️ SCOPE: ACTIVE LICENCES ONLY — 597451 of 1,603,416 source rows. Expired, cancelled, surrendered and revoked licenses are outside this site. Absence is not evidence that someone never held a license.
- ⚠️ 13925 active licenses carry a disciplinary action. This site publishes only AGGREGATE counts: no page attaches an action to a named person, and no page carries a case number.
- ⚠️ DORA records the type of action and NO REASON. The two most common entries are a stipulation and a letter of admonition — agreed outcomes, not findings of danger — and every license concerned is active.
- 33716 licenses carry one of 6 codes that DORA's own type table does not translate; they appear under the raw code.
- Colorado fixes one expiry date per license type, so a whole profession renews on the same day. That calendar is at /renewal/ and is published nowhere else as a calendar.

## Privacy

License holders are named. City and profession pages list up to 150 of them each — name, license number, type or city, first issued and expiry — because that is what the State of Colorado publishes as a public record. Indexable pages carry no postcode, and no disciplinary action or case number is ever attached to a name. A license holder who asks is removed from this site, without having to give a reason.

## Callable tools (WebMCP)

These tools are described in `/api/v1/tools.json` and can be called in the browser through WebMCP. They are free.

- [/api/v1/tools.json](https://colorado-license-lookup.com/api/v1/tools.json)

- `describe_dataset` : Coverage, source, licence and collection date of this directory.
- `get_sample` : Free sample of the dataset, in the format of the full delivery.
- `changes_since` : Differences between two releases of the register. RESERVED: scope and terms are set on request. — Reserved — not served yet. Terms: https://colorado-license-lookup.com/pro/
- `export_dataset` : Full, normalised export of the dataset. RESERVED: scope, format and terms are set on request. — Reserved — not served yet. Terms: https://colorado-license-lookup.com/pro/
- `request_dataset` : Send the publisher a request about the full dataset. Only what is filled in here is transmitted.