Example methods and apparatus to determine media impressions using distributed demographic information are disclosed. A disclosed example method to monitor media content exposure involves receiving, at a first internet domain, a first request from a client computer, the first request indicative of access to the media at the client computer, sending, from the first internet domain, a response to the client computer, the response to instruct the client computer to send a second request to an intermediary associated with a sub-domain of a second internet domain, the second request to be indicative of the access to the media at the client computer, the intermediary to transmit an indication of the second request to an entity of the second internet domain, and logging an impression of the media.