Methods, systems, and apparatus, including computer programs encoded on computer storage medium, for performing a blend polygon search. In one aspect, the method may include receiving one or more search parameters. Additional actions may include obtaining two or more sets of data that each represent a respective geographic area, the two or more sets of data including at least one set of data that is provided by a third party geographic data set provider, defining a particular geographic area to search based at least on the two or more sets of data that each represent a respective geographic area, identifying one or more entities that (i) are indicated as responsive to one or more of the search parameters, and (ii) are associated with the particular geographic area, and providing a representation of the entities for output.