where can I get free lists of businesses with contact information and over 500 employees?
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Try this site where you can get free business cards of people in small or large companies
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google\nyahoo \nmsn\ndmoz.org\n\n\nCheck with Alexa, they have a top 500 list
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You can try in yahoo business, or search in google..
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Try the sites below for free business cards!
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CHAMBER OF COMMERCE\nOR\nYELLOW PAGES OF YAHOO PHONE DIRECTORY MIGHT HELP
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phonebook, google, directory information, etc.
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http://forbes.com Has lists of top businesssssezs for every size.
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Have a look to the commercial chamber. They should keep such a list.\n\nKaterina
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http://www.topica.com is a pretty good one.  I used to use it for clients listings totaling over 250,000 recipients broken into about 12 lists.
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I don't think you can get such a list. There are privacy laws to protect such.
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Try Yell.com, they usually work well, or if you dont find anything there look in the directory Yelllow Pages or Business Pages
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try www.businessballs.com - it's very good, and it's free, with lots of downloadable stuff
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Try:             craigslist.com                                          \nI have used it for many things and found it to cover a vast area services.
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I believe that there is a Yahoo Business contact that has information like that. Though I would guess that it is not free. Or there are places in the US that gather information of a consumer based on their internet usage and such. They have been in the news in recent months due to security breaches, Sorry I don't recall the name. Those would be the places that I would look for that kind of information.
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http://list.helpmeoutsource.com
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Look in the phone book or call directory enquiries!
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Through their website. The SP500 list can be found at Standard and Poor's website for instance.