Research Paper 219, December 2009, vi, 44 pp.  This paper explores Statistics Canada’s recently released place-of-work employment data at the census tract level for the combined metropolitan areas of Oshawa, Toronto and Hamilton. The maps show the spatial implications of the sectoral shifts of the last 30 years, as jobs in manufacturing have disappeared or relocated, while jobs in financial and business services have grown rapidly. This latter growth has reinforced downtown concentration, and created a new type of work environment in the outer suburbs: a mix of office towers, industrial parks, and power centres linked by freeways.