The Integrated Land Use, Transportation, Environment (ILUTE) model system is an agent-basedmicrosimulation model that dynamically evolves the urban spatial form, economic structure,demographics and travel behavior over time for the Greater Toronto-Hamilton Area (GTHA).This paper presents the ILUTE Demographic Updating Module (I-DUM), which updates theresidential population demographics throughout the simulation. Given a synthetic basepopulation, I-DUM updates the attributes of the agents at each time step. New agents areintroduced through birth and in-migration, while agents exit through death and out-migrationevents. Unions between agents are formed through a marriage market, while a divorce modeldissolves existing ones. Transitions to new households are also triggered by a move-out model.In addition to its comprehensive scope, I-DUM is a closed demographic model where socialnetworks are built and maintained throughout the simulation. Maintaining social connectionsbrings some advantages for modeling travel behavior and location choice. I-DUM is being testedagainst a twenty-year (1986-2006) period using a 100% synthetic GTHA population (4.1 millionpersons, 1.1 million families, 1.4 million households). The results are compared againsthistorical observations across multiple dimensions. In general, I-DUM exhibits a strongperformance, and the authors have confidence that it can maintain the validity of inputs to theother behavioral models in ILUTE. I-DUM's implementation has also been parallelized whichbrings significant performance improvements. Starting with over 6.5 million agents (whichgrows past 10 million), the simulation takes just under 10 minutes to complete a twenty-year run.
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