This paper presents the data preparation and processing steps that were taken to provide inputs for the MOLAND model application for the Greater Dublin Region. The model requires spatial and socioeconomic data by county for the beginning and end years of the calibration period i.e. 1990, 2000 and 2006. In addition, projections of socio-economic variables are required for implementing different scenarios. Basic data requirements of the new transport model and description of related data collection works are also presented. Heretofore detailed information and justification for approaches taken in preparing data for ingestion to MOLAND has been undocumented. This paper aims to address that gap. Therefore the steps that have been taken to prepare and process these datasets are described in detail including background information, interpretation and processing methods used and the main assumptions and generalisations adopted.