Sponsors 2019 Nantucket Half Marathon Sponsors! If you are interested in sponsoring the 2019 Nantucket Half Marathon, please contact the Nantucket Triathlon Club at nantuckettriathlonclub@gmail.com! Nantucket Half Marathon finish line banner thanks to 2013 sponsorship by Congdon and Coleman Insurance! Share this:Click to email this to a friend (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Like this:Like Loading...