Methods and apparatus to associate geographic locations with user devices

An apparatus to associate a geographic location with a user device, the apparatus comprising:

• means for classifying a network that connects a user device to an audience measurement entity based on source identifying information transmitted from the user device;
• means for determining a geographic location associated with an impression indicated by media identifying information based on a means of identifying a location determined based on at least one of:
• a network address included in the source identifying information and a first mapping that maps the network address to the geographic location when the network is a fixed network;
• and
• location services information included in the source identifying information and a second mapping that maps the location services information to the geographic location when the network is a mobile network;
• and
• means for classifying the geographic location of the user device as a home location based on a timestamp associated with the impression, the timestamp retrieved from a database of user profiles.