Abstract: Summary Overview A new multi-state national compilation of official hate crime data across twenty states found incidents overall increased by 5.03% in 2015. Hate crimes against Muslims, however, surged 78% to a total of 196 reported incidents last year. These are levels not surpassed since the aftermath of the 9/11 attacks in 2001, and come at a time of heightened prejudice, recurring terrorism and polarized politics. Projections for anti-Muslim hate crimes for the entire nation for 2015 are at 260 incidents, a 68.9% annual increase, but caution must be exercised regarding estimates. The proportion of Muslims targeted in all hate crime also rose dramatically to 4.51%. The newer data categories of anti-Arab and Anti-Gender/Transgender also increased substantially, 219% and 40% respectively; but some of this increase may arise from improved reporting. Tabulations for larger categories were relatively stable with annual variances within a range of about plus or minus five percent or less. Muslims, Jews, African-Americans, and LGBT people continue to experience hate crime far in excess of their proportion of the population, while anti-Latino incidents remained stable. This new analysis of hate crimes from official government data complied by the Center for the Study of Hate & Extremism, includes four of the five most populous U.S. states and represents 53.5% of the nation’s population. Additional data also revealed a severe increase in hate crime homicides in 2015 to at least 14, a level not seen in well over a decade, as fatal armed attacks by lone-wolf extremists become more deadly, both in total numbers and proportionately. Lastly, our analysis of daily data following terrorist attacks found a tolerant statement about Muslims by a political leader was accompanied by a sharp decline in hate crime, while a less tolerant announcement was followed by a precipitous increase in both the severity and number of anti-Muslim hate crimes.