Abstract: Methods and systems are provided for determining and using market areas associated with one or more branches of a business. Market areas are determined using a combination of deterministic and probabilistic techniques. Distances are calculated between customers and associated branches and a convex hull formed containing the closest 60%. A block and a tightened block is formed of dissemination areas contained within the convex hull. Where blocks are shared between branches, dissemination areas are weighted according to the portion of customers associated with each branch.