Tollfreephone.com is an online directory of toll free numbers in the United States.
So, if you are looking for a company’s number, this can be a place to check. You must simply select the name of the company in order to get its phone number. You can also look by state and city, keyword, and reverse look up. This means that by submitting the phone number you get the name of the company. In order to have your company’s phone number listed here, either if it is a 888, 877, 866 or 800 you must pay. Here you can find about all their different fees and services. You can either have it simply listed, listed in bolds, listed with a link to your website, etc. Anyway, the most expensive service they offer costs just 15 US dollars a year. Finally, if you need further assistance, you can contact them to their email, which you can find here. 
