Methods and apparatus to determine engagement levels of audience members are disclosed. An example computer readable storage medium includes computer readable instructions that, when executed, cause a processor to at least analyze image data from a sensor to determine whether an environment in which media is to be presented by a first device includes a second device with an illuminated display, and when the environment includes the second device with the illuminated display, determine whether the illuminated display of the second device is associated with a media presentation by the second device.