Abstract Modeling supply and demand data is useful for regional outdoor recreation planning. At the statewide level, State Comprehensive Outdoor Recreation Plans (SCORPs) are prepared to satisfy the requirements of the Land and Water Conservation Fund (LWCF). In Massachusetts, the most recent SCORP was prepared in 2006. Two of the primary tasks were updating the recreation resource inventory statewide and developing an extensive GIS data base. For the demand side, the Commonwealth of Massachusetts utilized data collected in 1995 that focused on recreation site usage patterns, assessed satisfaction with outdoor recreation areas, and evaluated unmet needs. This paper presents an example of updating SCORPs using current demographic data (US Census) and geographic supply data (MassGIS).