Methods and apparatus are disclosed to generate a cross device panel by determining that a first panelist associated with a first panel data and a first device is also associated with a non-paneled device. Example methods and apparatus disclosed herein match, via a processor, a second panelist associated with second panel data to the first panelist based on (1) the second panelist having demographics matching the first panelist and (2) the second panelist being associated with a second device corresponding to the non-paneled device of the first panelist, and generate a cross device panelist profile for the first panelist, the cross device panelist profile comprising at least some of the first panel data and at least a portion of the second panel data.