Try HOOVERS to start (they won't have them all)...
and what used to be called "Contacts Influential", and HAINES criss cross directory, Thomas Register for most mfgrs,
Your local C of C and BBB may have a few more.
Call your library and ask if they have a "comprehensive" business directory that lists number of employees.
HOOVERS has that info, but they won't have the mom and pops.
GJA
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