Systems and methods provide optimized property risk ratings and, more particularly, optimized property risk ratings defined by evaluating ratings on a by peril basis. Systems and methods also price insurance products and underwrite insurance products using risk data that has been optimized on a by peril basis. A territory is subdivided into a plurality of regions determined in accordance with at least one predetermined factor. Loss costs representing historic costs for various insured perils are retrieved from a computerized database using a data processor. The loss costs are sorted on a per-peril basis for each of the regions using the data processor. Peril zones are created for each peril that represent related regions in which loss costs for a particular peril are roughly equivalent.