Methods, apparatus, systems, and articles of manufacture are disclosed to generate synthetic respondent level data. An example apparatus includes at least one memory; processor circuitry to execute instructions to: identify locations corresponding to monitored panelists; when a location of the identified locations corresponds to two or more affiliates, sum tuning minutes of the two or more affiliates; generate an affiliate probability based on the sum; convert first data of households in the location to a candidate receivability session based on the affiliate probability; generate a seed panel, the seed panel to include at least one of the monitored panelists selected based on a population associated with return path data; and donate second data associated with a donor pool of first panelists to second panelists included in the seed panel when the second panelists are included in the seed panel, the second panelists corresponds to faulty media monitoring equipment.