How to Look Up a Delaware LLC via API

Published 2026-04-11 by OpenSOSData

Delaware is the most popular state for business incorporation in the United States. With over 1.5 million registered entities for a state population of roughly 1 million, more businesses are incorporated in Delaware than actually operate there.

Why Delaware?

Delaware's Court of Chancery specializes in business law, making it the preferred jurisdiction for corporations, LLCs, and LPs. Major companies from Apple to Google are incorporated in Delaware. If you are verifying a U.S. business entity and do not know its state of incorporation, Delaware is the best first guess.

Searching Delaware Records via API

curl -X POST https://api.opensosdata.com/v1/lookup \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"entity_name": "Apple Inc", "state": "DE"}'

Response

A successful Delaware lookup returns the entity name, status (Good Standing, Void, etc.), entity type, registered agent name and address, state file number, and formation date.

Cost

Each Delaware lookup costs $0.0314. Results are cached for 7 days. Add ?fresh=true to force a new query.

For a full list of supported states, see the state coverage page. See also: Delaware state page.