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We present the redshift catalogs for the X-ray sources detected in theChandra Deep Field North (CDF-N), the Chandra Large Area Synoptic X-ray Survey(CLASXS), and the Chandra Lockman Area North Survey (CLANS). The catalogs forthe CDF-N and CLASXS fields include redshifts from previous work, while theredshifts for the CLANS field are all new. For fluxes above 10^-14 ergs cm^-2s^-1 (2-8 keV) we have redshifts for 76% of the sources. We extend the redshiftinformation for the full sample using photometric redshifts. The goal of theOPTX Project is to use these three surveys, which are among the mostspectroscopically complete surveys to date, to analyze the effect of spectraltype on the shape and evolution of the X-ray luminosity functions and tocompare the optical spectral types with the X-ray spectral properties.  We also present the CLANS X-ray catalog. The nine ACIS-I fields cover a solidangle of ~0.6 square degrees and reach fluxes of 7x10^-16 ergs cm^-2 s^-1(0.5-2 keV) and 3.5x10^-15 ergs cm^-2 s^-1 (2-8 keV). We find a total of 761X-ray point sources. Additionally, we present the optical and infraredphotometric catalog for the CLANS X-ray sources, as well as updated optical andinfrared photometric catalogs for the X-ray sources in the CLASXS and CDF-Nfields.  The CLANS and CLASXS surveys bridge the gap between the ultradeep pencil-beamsurveys, such as the CDFs, and the shallower, very large-area surveys. As aresult, they probe the X-ray sources that contribute the bulk of the 2-8 keVX-ray background and cover the flux range of the observed break in thelogN-logS distribution. We construct differential number counts for eachindividual field and for the full sample.

The OPTX Project I: The Flux and Redshift Catalogs for the CLANS, CLASXS, and CDF-N fields