Abstract: In one aspect, a method includes receiving query fingerprint data representing content received by a content-presentation device. The method also includes identifying a geographic area of the content-presentation device. The method also includes using at least the identified geographic area as a basis to select, from among a plurality of reference fingerprint data sets, a reference fingerprint data set that corresponds with the identified geographic area. The method also includes detecting a match between the query fingerprint data and at least a portion of reference fingerprint data in the selected reference fingerprint data set. The method also includes responsive to detecting the match, performing an action.