List supplied courtesy of Mr Phil Grinton from California, February 2004.
From the website of the D-Day Museum, Portsmouth (www.ddaymuseum.co.uk)
The list is compiled from the original wartime list of US units in the UK.
Column 1 (APO): Army Post Office code
Column (Ech): Echelon number
(-) minus sign indicates that part of the unit was elsewhere
Counties are the pre-1974 British counties.
The map co-ordinates in the last column are for the "Modified British System" that was in use during the Second World War, which does not equate to modern Ordnance Survey maps.
APO Ech Location Unit Pre 1974 County Coordinates