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We utilize 16 band Hubble Space Telescope (HST) observations of 18 lensingclusters obtained as part of the Cluster Lensing And Supernova survey withHubble (CLASH) Multi-Cycle Treasury program to search for $z\sim6-8$ galaxies.We report the discovery of 204, 45, and 13 Lyman-break galaxy candidates at$z\sim6$, $z\sim7$, and $z\sim8$, respectively, identified from purelyphotometric redshift selections. This large sample, representing nearly anorder of magnitude increase in the number of magnified star-forming galaxies at$z\sim 6-8$ presented to date, is unique in that we have observations in fourWFC3/UVIS UV, seven ACS/WFC optical, and all five WFC3/IR broadband filters,which enable very accurate photometric redshift selections. We constructdetailed lensing models for 17 of the 18 clusters to estimate objectmagnifications and to identify two new multiply lensed $z \gtrsim 6$candidates. The median magnifications over the 17 clusters are 4, 4, and 5 forthe $z\sim6$, $z\sim7$, and $z\sim8$ samples, respectively, over an averagearea of 4.5 arcmin$^2$ per cluster. We compare our observed number counts withexpectations based on convolving "blank" field UV luminosity functions throughour cluster lens models and find rough agreement down to $\sim27$ mag, where webegin to suffer significant incompleteness. In all three redshift bins, we finda higher number density at brighter observed magnitudes than the fieldpredictions, empirically demonstrating for the first time the enhancedefficiency of lensing clusters over field surveys. Our number counts also arein general agreement with the lensed expectations from the cluster models,especially at $z\sim6$, where we have the best statistics.

CLASH: A Census of Magnified Star-Forming Galaxies at z ~ 6-8