Integrated circuit devices including raised source/drain structures having different heights are disclosed. An integrated circuit device can include a first raised source/drain structure having a first height above a substrate in a first region of the integrated circuit including devices formed at a first density. The integrated circuit device can further include a second raised source/drain structure having a second height that is greater than the first height in a second region of the integrated circuit including second devices formed at a second density that is less than the first density.