  We report the discovery of 6576 new spectroscopically confirmed white dwarf
and subdwarf stars in the Sloan Digital Sky Survey Data Release 12. We obtain
Teff, log g and mass for hydrogen atmosphere white dwarf stars (DAs) and helium
atmosphere white dwarf stars (DBs), estimate the calcium/helium abundances for
the white dwarf stars with metallic lines (DZs) and carbon/helium for carbon
dominated spectra DQs. We found one central star of a planetary nebula, one
ultra-compact helium binary (AM CVn), one oxygen line dominated white dwarf, 15
hot DO/PG1159s, 12 new cataclysmic variables, 36 magnetic white dwarf stars, 54
DQs, 115 helium dominated white dwarfs, 148 white dwarf+main sequence star
binaries, 236 metal polluted white dwarfs, 300 continuum spectra DCs, 230 hot
subdwarfs, 2936 new hydrogen dominated white dwarf stars, and 2675 cool
hydrogen dominated subdwarf stars. We calculate the mass distribution of all
5883 DAs with S/N>15 in DR12, including the ones in DR7 and DR10, with an
average S/N=26, corrected to the 3D convection scale, and also the distribution
after correcting for the observed volume, using 1/Vmax.
