List of County Codes

GET https://aqs.epa.gov/data/api/list/countiesByState?email={{email}}&key={{key}}&state={{state}}

This returns a list of all CA county codes. Just as you needed a state numerical code for your location searches, you will also need a county code.

Replace the {{state}} value for whichever state you are searching, as this example focuses on California.

Request Params