 garrison is a census-designated place (cdp) in baltimore county, maryland, united states, adjacent to owings mills. it consists mainly of the mcdonogh area and valley centre. the population was 8,823 at the 2010 census. ==geography== garrison is located at  (39.401055, -76.751073). according to the united states census bureau, the cdp has a total area of {{convert|8.2|km2
Census-designated_places_in_Baltimore_County,_Maryland Census-designated_places_in_Maryland