Marathon Information & Associations, Florida Keys Sponsored Link Premium Sponsor Links now available! Take advantage of this great opportunity to spotlight your business. Showcase your property or business and stay ahead of the competition! Call us at 305-292-1880 or email us at [email protected]! GREATER MARATHON CHAMBER OF COMMERCE 12222 Overseas Highway Marathon FL 33050 800-262-7284 305-743-5417 Fax 305-289-0183 Email Website Venture into the Islands of Marathon in the Heart of the Florida Keys.