Most of Chinbrook including the main crossroads falls within the London Borough of Lewisham and under the postcode district , although immediately northeast from the crossroads is the border with the London Borough of Bromley and the  postcode district.
Most of Chinbrook, including the main intersection, falls within the London Borough of Lewisham and under the postal area , whereas the area immediately northeast from the intersection is on the border with the London Borough of Bromley and the postal area.