Methods, apparatus, systems and articles of manufacture are disclosed for determining the demographics of users. An example apparatus includes at least one memory, instructions, and processor circuitry to at least one of execute or instantiate the instructions to extract a first media data pair from first media presentation data from a media provider, identify a second media data pair in second media presentation data based on a comparison of the first media data pair and the second media presentation data, the second media data pair generated in response to a meter accessing streaming data associated with a second media presentation device accessing the streaming media, identify a panelist associated with the second media data pair, and, in response to identifying the panelist, cause a server to associate the second media data pair and demographic data associated with the panelist included in a report by transmitting the report to the server.