Emily Blunt Evelyn Abbott John Krasinski Lee Abbott Millicent Simmonds Regan Abbott Noah Jupe Marcus Abbott Cillian Murphy Emmett Djimon Hounsou Man on Island Wayne Duvall Roger Okieriete Onaodowan Policeman Blake DeLong Umpire Silas Pereira-Olson 7 Year Old Island Boy (uncredited) Scott Matheny Townsperson (uncredited) Liz Cameron Island Person Lauren-Ashley Cristiano Emmett's Wife Ashley Dyke Woman in the Window Andy Rich Island person Robert A. Coldicott Townsperson Zachary Golinger Emmett's Son Sheri Fairchild Woman at Hair Salon Barbara Singer Old Woman in Store Gary Sundown Island Person Kyle Licht Townsperson with Car David Lundy Marina Person Krzysztof Mardula Neighbor Scoot McNairy Marina Man