Local and State:
Reference USA - 40 million businesses (can search by zip, county, MSA, state)
also see its: New Businesses module; Historical Businesses module (most recent 10 years)
Mergent Intellect - more than 70 million US companies, plus more than 200 million global companies. Replaces D&B Million Dollar Database
Corporation Search (GA Secretary of State website)
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Atlanta Business Chronicle Book of Lists (December issue) - offsite, Library Services Center - REFERENCE HF5068.A8 B665
Georgia Business Directory, offsite, Library Services Center - HF5056.G4 G46 from 1989 to about 2016 some gaps)
Georgia Manufacturers Register (offsite, Library Services Center - HD9727.G4 G43 - library has from 1992-2003 (some gaps))
Official Georgia Manufacturers Directory (offisite, Library Services Center - REFERENCE HF5065.G4 H37)