Companies provide the phone number for company headquarters on their website. Most often companies place this information a section of the website called contact us or contacts. FindTheCompany.com, a business directory, lists over 33 million companies and their contact information, including links to headquarters phone numbers.
Companies often place a link to company contact information among the navigation links across the top of the website. Alternatively, companies place the contacts link at the bottom of the page, along with other informational links about the company.
Larger companies and multinational corporations may list regional headquarters on the contacts page or provide a menu of options for contacting the company. Cisco Systems, for example, offers a menu on its contact page that allows users to identify themselves by location, language, or job title in order to provide the most pertinent contact information.