Married his wife, Adia, in May 2017. Adia is originally from Baltimore and attended Hilton Elementary School. Dealt with a difficult upbringing growing up, eventually moving in with his youth football coach in high school. Maclin's struggles helped inspire him to create the JMac Gives Back Foundation, which is dedicated to helping children and families in alternative living situations. Wrote a weekly post for GQ.com in 2011, providing readers with a behind-the-scenes look of the Eagles' season and life off the field for a young NFL star.