After researching the Internet I have found the following web hosting providers to be in the top 10 in the hosting industry. They have hundreds of thousands customers and host millions of web sites. All are USA based web hosting companies.
HostGator – over 200,000 customers and 2,500,000 websites hosted on their servers.
Bluehost – more than 1,000,000 websites hosted
Hostmonster – 600,000 plus sites.
Ixwebhosting, Webhostingpad, Justhost, Lunarpages and Dreamhost. All are top rated hosts and you will hardly find bad reviews for any of them, though there are some bad reviews, but with such big number of clients that is normal. They all offer many features including: PHP, MySQL, control panels, FTP, one-click installers for wordpress, drupal, joomla, shopping carts, galleries and other applications, at least 30 days money guarantee, 24/7 support etc.