The H-1B Employer Data Hub includes data from fiscal year 2009 through the first quarter of fiscal year 2019 on employers who have submitted petitions to employ H-1B nonimmigrant workers.
Data can be queried by fiscal year, employer name, city, state, zip code, and NAICS code.
The H-1B Employer Data Hub has data on the first decisions USCIS makes on petitions for initial and continuing employment.
It identifies employers by the last four digits of their tax identification.
You can download annual and query-specific data in .csv format.