1. A method performed by data processing apparatus, the method comprising: identifying a search query from a search query log that includes data specifying search queries corresponding to particular geographic regions; generating a geo-query count that represents a total number of times that the search query was received over a specified period in a geographic region; comparing the geo-query count to a corresponding expected query count for the search query in the geographic region, wherein the expected query count is a baseline number of times that the search query is expected to be received in the geographic region based on the number of times that the search query is received in a baseline geographic region that is different than the geographic region; determining that the search query has a geo-query count that exceeds the corresponding expected query count by at least a threshold amount; and classifying the search query as a local query for the geographic region.
2. The method of claim 1 , further comprising adjusting an initial result score for at least one local search result that has been selected to be provided in response to receiving the search query, the initial result score being a score used to select an order in which search results provided in response to the search query are presented, and the local search result being a search result that corresponds to the geographic region.