See the US Companies Database Free Download XLS file and download it.
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Us Companies Database Free Download Xls
- Powrbot (free)
- Company lists by Country (e.g. United States (note, this is a 400MB+ file), United Kingdom).
- Company lists by Industry (e.g. Advertising, Banks).
Fincen (free)
Contains a downloadable CSV.
Companies House (free)
- A downloadable data snapshot
- Wikipedia (free)
- Crunchbase (free & paid)
- Inc 5000 (free & paid)
- Hoovers (paid)
- AngelList (free and paid)
- Global Open Data Index
- MIT Libraries
- Evidon
You can download all as CSV and XLS format free.