Colorado business entity search: free lookup and open API

Every endpoint on this page was live-probed on 2026-07-29 by the Aidenix Atlas catalog.

What is the Colorado business entity search?

The Colorado business entity search is the public lookup over the Secretary of State's business register, and unlike most states Colorado publishes the whole file as a keyless API with a real status field. In our data — the Aidenix Atlas catalog, endpoint live-probed on 2026-07-29 — the register holds 3,088,214 entity records, of which only 1,047,422 are in good standing. That ratio is the single most useful fact about state registers, and it is why status matters more than the name you searched for:

• Every record carries an entity status, a formation date, a registered agent and a principal address.
• The API at data.colorado.gov returns all of it as JSON with no key and no signup.
• The official Secretary of State form covers one lookup at a time; the API covers the file.

Key facts at a glance

A key-facts table is the 60-second version of this page. In our data: 3,088,214 records, 6 status values, 0 API keys required, and one name-field quirk that corrupts 56% of exact matches. Every row from our own probe run of 2026-07-29, according to the Aidenix Atlas catalog logs:

How do you search Colorado business entities?

A Colorado entity search is one HTTP GET against the state's open-data API, and in our data it returns JSON filterable on all 18 fields of the record. According to our probe of 2026-07-29, a name search across the 3,088,214 records needs no key and no client library:

# name search, keyless — note the wildcard is %25 once URL-encoded
curl "https://data.colorado.gov/resource/4ykn-tg5h.json?\$where=upper(entityname)%20like%20'%25PALANTIR%25'&\$limit=3"

We ran exactly that on 2026-07-29, and here are the three records as returned, unedited:

Why do 56% of Colorado name matches fail?

Colorado writes the entity's status into the name field itself, and that single design choice breaks exact-name matching across the whole file. Look again at the sample above: the stored name is not «PALANTIR EXPLORATION SERVICES, INC.» but «PALANTIR EXPLORATION SERVICES, INC., Dissolved December 2, 2018» — status text, comma and date included. We counted how far this reaches on 2026-07-29: 1,733,645 of 3,088,214 records, or 56% of the register, carry a status suffix inside the name.

The consequences are specific, and in our data they surprise every team that meets this file for the first time:

• Exact-match joins on company name silently miss more than half the register.
• Deduplicating against another source produces false negatives, not false positives — the harder failure to notice.
• The same legal entity can appear once cleanly and once with a suffix if it changed status.

The fix is to normalise before matching: cut the name at the first comma followed by a status word, then match on the remainder, and read the real status from the entitystatus field where it belongs.

What do the Colorado entity type codes mean?

Colorado stores entity type as a short code rather than a label, and 5 codes cover 97% of the file. Distribution from our probe run of 2026-07-29, counted across all 3,088,214 records:

«Domestic» means formed under Colorado law; «foreign» means formed in another state and registered to operate here. In our data the jurisdictonofformation field — note the state's own spelling, which is missing an «i» — carries the home state for foreign entities.

What this dataset cannot tell you

A state business register is a record of legal existence and standing, not of commerce, and in our data this file leaves 4 questions open. Of the nearly 4,000 sources the Aidenix Atlas catalog tracks, Colorado is among the more complete free registers — 3,088,214 records with a real status field — and it still stops here:

• No owners or officers. The registered agent is published; members, directors and beneficial owners are not.
• No financials. Revenue, headcount and assets appear nowhere in a state register.
• No industry code. There is no SIC or NAICS field, so sector has to be inferred or joined from elsewhere.
• No filing history. You see current status, not the sequence of filings that produced it.

Frequently asked questions

A Colorado entity question usually reduces to one of 3 things — cost, what a status means, and whether the file can be taken whole. In our data, according to the probe run of 2026-07-29:

Is the Colorado business entity search free? Yes, on both routes. The Secretary of State's web form is free for single lookups, and the data.colorado.gov API serves all 3,088,214 records as JSON with no key, no registration and no quota.

What does «delinquent» mean in Colorado? It means the entity missed its periodic report or fee and has lost good standing without being dissolved. In our probe of 2026-07-29 this was the single largest group in the file — 1,109,752 records, more than the 1,047,422 in good standing — so a hit on a Colorado name is more likely to be a lapsed entity than a current one.

Can I download the whole Colorado register? Yes. The Socrata API paginates with $limit and $offset, and the full 3,088,214 records are retrievable without a key, which is what makes Colorado unusually friendly for bulk company research compared with states that publish no API at all.

How we verify these claims

Our verification method is a live probe, not a citation chain — every count, sample and limitation on this page comes from requests we sent ourselves on 2026-07-29. What the probe run covers, in our data:

• Endpoint liveness: the API answered HTTP 200, out of the nearly 4,000 sources the Aidenix Atlas catalog tracks.
• Live samples: the Palantir records, the status distribution and the type distribution are unedited API output.
• The 56% figure is counted, not estimated: we queried the register for names containing a status suffix and report the returned number.
• Freshness contract: when a source drifts, the probe fleet flags it and this page gets re-verified — the «last probed» date above is that promise.

Neighbouring registers with the same access model: New York and Connecticut. The full free stack across states, SEC and international registers: our company data API guide.

Source facts from the Aidenix Atlas catalog, probed 2026-07-29. Found an error? The catalog re-probes on every report.