 All of the other residents living in / businesses located in Chillum, have Hyattsville addresses.Chillum takes its name from "Chillum Castle Manor," the land patent established in 1763, by William Dudley Digges.It included lands in the present-day District of Columbia and in Prince George's County, and was composed of previously established land patents such as Henrietta Maria, Widows Purchase, Yarrow and Yarrow Head.