The Cygnus OB2 association and its surroundings display the richest collection of massive stars in our nearby Galactic environment and a wealth of signposts of the interaction between these stars and the interstellar gas. We perform a magnitude-limited, homogeneous census of O and early B-type stars with accurate spectral classifications in the blue, in a 6{deg}x4{deg} region centered on Cygnus OB2 that includes most of the Cygnus X complex, a sizeable fraction of the adjacent Cygnus OB9 association, and a large area of the field surrounding these complexes

Cone search capability for table J/A+A/543/A101/OBstars (Known and new spectroscopically classified O and B stars in the region with physical parameters)

Cone search capability for table J/A+A/543/A101/table4 (Other candidate O and B stars without spectral classification)

Cone search capability for table J/A+A/543/A101/table5 (Later-type stars)

Cone search capability for table J/A+A/543/A101/table2 (Stars with previous classification reobserved by us)

Cone search capability for table J/A+A/543/A101/table6 (O and B stars from Massey & Thompson (1991, Cat. J/AJ/101/1408) not selected by our criterion)