You may also want to include a fax number, as well as web and email addresses, but it isn't necessary to put all this information on your letterhead. That's what business cards are for. Elements in your letterhead design should complement your logo. For example, if your logo is orange and purple, consider using one of the same ink colors for your contact information. You should also use a font that works well with your logo, though it needn't be a font that's used in the logo itself.
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