D&B Hoovers offers the most advanced search features of any of the options we reviewed, allowing users to search by industry code, geographic location radius, and even variables like IPO status and underwriter. While the search interface is not as modern as other options, it provides the most filters to conduct detailed searches, and many of the other services depend on D&B to verify their contact information.

As a last resort, you could try cold calling by phone. This is probably the most depressing and soul destroying activity on the planet. Even if you get past the usual questions such as ‘If you’re selling something – I’m not interested’ and ‘How did you get my number?’ you need a really slick and professional script and the ability to recognize and avoid lonely old ladies who just want to interact with someone, anyone, in fact.
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