A method and system for blurring location data. Location data indicating a location of a mobile device and a user identification associated with the mobile device is received. Prestored data indicating a plurality of entries is accessed, each entry having a respective stored location associated with a corresponding location status. In response to an entry in the prestored data including a stored location corresponding to the location of the mobile device indicated in the location data, a derived location of the mobile device is generated based on the corresponding location status of the stored location, wherein the derived location is less accurate than the location indicated in the received location data. The derived location of the mobile device is stored in a mobile device location log associated with the received user identification.