The Massive Young star-forming complex Study in Infrared and X-rays (MYStIX) project requires samples of young stars that are likely members of 20 nearby Galactic massive star-forming regions. Membership is inferred from statistical classification of X-ray sources, from detection of a robust infrared excess that is best explained by circumstellar dust in a disk or infalling envelope and from published spectral types that are unlikely to be found among field stars. We present the MYStIX membership lists here, and describe in detail the statistical classification of X-ray sources via a "Naive Bayes Classifier."

Cone search capability for table J/ApJS/209/32/reg (List of the 20 nearby Galactic massive star-forming regions; table added by CDS)

Cone search capability for table J/ApJS/209/32/mpcm (MPCM (MYStIX Probable Complex Members) sources and properties (table 2))

Cone search capability for table J/ApJS/209/32/table7 (Counterparts to X-ray sources and classification probabilities)