Abstract: In one aspect, a computer-implemented method for assessing the accuracy of Internet Protocol (IP) address-based geolocation data may generally include accessing a first set of usage pattern data associated with a plurality of IP addresses that are known to be assigned to computing devices located within a geographic area, wherein the first set of usage pattern data is associated with online-based activities. The method may also include determining a usage pattern classifier for the geographic area based on the first set of usage pattern data and accessing a second set of usage pattern data associated with at least one IP address contained within an IP block that has been mapped to the geographic area, wherein the second set of usage pattern data is associated with online-based activities. In addition, the method may include analyzing the second set of usage pattern data based on the usage pattern classifier.