Washington business licenses, one API call away.

Amalgament indexes 136,923 business licenses for Washington from 9 public sources, normalized into one schema and joined to the businesses and parcels behind them. Query them through one REST API and one MCP server, or scope any call to Washington with a single parameter.

Coverage in Washington

136,923 business licenses from 9 public sources.

Most recent record dated 2025-09-12. The /freshness endpoint reports every source's last pull.

Sources

• Seattle, Washington
• Washington (state)
• WA (state)
• Seattle, WA

One call, scoped to WA

curl -H "X-API-Key: $OPENFOLIO_KEY" \
  "https://api.amalgament.com/search?q=roofing&dataset_type=business_license&jurisdiction=WA"

Common questions

How many business licenses does Amalgament have for Washington?

136,923 business licenses from 9 public sources in Washington, normalized into one schema and queryable in a single API call or MCP tool call.

Can I filter Amalgament to just Washington?

Yes. Pass jurisdiction=WA to the /search endpoint, or ask your MCP-connected agent for Washington, and results are scoped to Washington business licenses.

All Business Licenses · New York · Colorado · Illinois · Texas · Delaware · Connecticut · Pennsylvania · Massachusetts