Methods and apparatus to determine media impressions using distributed demographic information are disclosed. An method includes sending to a client computer, via a processor serving a first internet domain, a response to a first request, the first request sent to the first internet domain and indicative of access to media at the client computer, the response to instruct the client computer to send a second request to an intermediary serving a sub-domain of a second internet domain, the second request to be indicative of the access to the media at the client computer, wherein the intermediary is to transmit first data about the second request to a data collection server of an audience measurement entity and second data about the second request to an entity of the second internet domain and logging an impression of the media.