Beers, Timothy CFlynn, ChrisRossi, SilviaSommer-Larsen, JesperWilhelm, RonaldMarsteller, BrianSun Lee, YoungDe Lee, NathanKrugler, JulieDeliyannis, C PSimmons, Andrew T.Mills, ElisabethZickgraf, F-JHolmberg, JohanFrebel, Anna2015-12-080004-637Xhttp://hdl.handle.net/1885/38286We report broadband UBVand/or BVRCIC CCD photometry for a total of 1857 stars in the thick-disk and halo populations of the Galaxy. The majority of our targets were selected as candidate field horizontal-branch or other A-type stars (FHB/A, N = 576), or candidate low-metallicity stars (N =1221), from the HK and Hamburg/ESO objective-prism surveys. Similar data for a small number of additional stars from other samples are also reported. These data are being used for several purposes. In the case of the FHB/A candidates they are used to accurately separate the lower gravity FHB stars from various higher gravity A-type stars, a subsample that includes the so-called blue metal poor stars, halo and thick-disk blue stragglers, main-sequence A-type dwarfs, and Am and Ap stars. These data are also being used to derive photometric distance estimates to high-velocity hydrogen clouds in the Galaxy and for improved measurements of the mass of the Galaxy. Photometric data for the metal-poor candidates are being used to refine estimates of stellar metallicity for objects with available medium-resolution spectroscopy, to obtain distance estimates for kinematic analyses, and to establish initial estimates of effective temperature for analysis of high-resolution spectroscopy of the stars for which this information now exists.Keywords: Stars: early-type; Stars: horizontal-branch; Stars: Population II; Techniques: photometric200710.1086/5093242015-12-08