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We present a spectroscopic catalog of the 1,564 brightest (J<9) M dwarfcandidates in the northern sky, as selected from the SUPERBLINK proper motioncatalog. Observations confirm 1,408 of the candidates to be late-K and M dwarfswith spectral subtypes K7-M6. From the low \mu>40 mas/yr proper motion limitand high level of completeness of the SUPERBLINK catalog in that magnituderange, we estimate that our spectroscopic census most likely includes >90% ofall existing, northern-sky M dwarfs with apparent magnitude J<9. Only 682 starsin our sample are listed in the Third Catalog of Nearby Stars (CNS3); mostothers are relative unknowns and have spectroscopic data presented here for thefirst time. Spectral subtypes are assigned based on spectral index measurementsof CaH and TiO molecular bands. A comparison of spectra from the same starsobtained at different observatories however reveals that spectral band indexmeasurements are dependent on spectral resolution, spectrophotometriccalibration, and other instrumental factors. After systematic corrections and arecalibration of the subtype-index relationships, we find that we canconsistently and reliably classify all our stars to a half-subtype precision.The use of corrected spectral indices further requires us to recalibrate the\zeta parameter, from which we estimate metallicities +/-0.5dex accuracy indwarfs of subtypes M2 and earlier, and +/-0.2dex accuracy for later (M3-M5)subtypes. Existing geometric parallax measurements are extracted from theliterature for 624 stars, and are used to determine spectroscopic andphotometric distances for all the other stars. Our catalog will be most usefulto guide the selection of the best M dwarf targets for exoplanet searches, inparticular those using high-precision radial velocity measurements.

A Spectroscopic Catalog of the Brightest (J<9) M Dwarfs in the Northern Sky