Methods, apparatus, systems, and articles of manufacture are disclosed to determine unique audience size via
clustered data. An example apparatus includes memory,
machine readable instructions, and processor circuitry to at least one of execute or instantiate the
machine readable instructions. The example processor circuitry is to form a first matrix identifying matching and non-matching instances of first values of respective
demographics of an audience of media and second values of the respective
demographics. Also, the processor circuitry is to normalize the first matrix to generate an account sharing adjustment matrix. Additionally, the processor circuitry is to apply the account sharing adjustment matrix to a vector of one or more counts of impressions of the media to correct for one or more members of the audience that share a user account registered with a
database proprietor, the one or more counts of the impressions corresponding to the respective
demographics.