Hoovers.com and YellowPages.com maintain the largest online business directories available to the public. Hoovers.com is a paid service, while YellowPages.com is completely free to use.
YellowPages.com maintains directories with listings for all over the nation, updated on a monthly basis through the public records received by telephone providers. For businesses, there are over 20 million listings available solely in the United States. YellowPages.com is also accessible through the YP app for all smartphones. Each month, YellowPages.com and the YP app receive more than 80 million visitors and have their services backed by over half a million advertisers in the United States.