Methods, apparatus, systems and articles of manufacture are disclosed to associate geographic locations with user devices. An example apparatus includes a beacon handler to: extract source identifying information from a beacon transmitted from a user device to an audience measurement entity in response to the user device accessing a webpage, and extract media identifying information from the beacon; a location identifier to, in response to detecting that the source identifying information indicates that the beacon was received from a mobile network query a location service of a provider of the mobile network to retrieve a location associated with the user device; and a location mapper to store the location in association with the media identifying information to credit an impression of the media identifying information to the location.