网上能搜到当地区域的罪案情况，比如http://www.neighborhoodscout.com/ny/brooklyn/crime/
直接节选一些上面网站里的描述给你看（可以直接看最后两段）：

The crime rate in Brooklyn is considerably higher than the national average across all communities in America from the largest to the smallest, although at 20 crimes per one thousand residents, it is not among the communities with the very highest crime rate. The chance of becoming a victim of either violent or property crime in Brooklyn is 1 in 49. Based on FBI crime data, Brooklyn is not one of the safest communities in America. Relative to New York, Brooklyn has a crime rate that is higher than 82% of the state's cities and towns of all sizes.


However, compared to other communities of similar population size, Brooklyn has a crime rate that is noticeably lower than the average. This means that for comparably sized cities all across America, Brooklyn is actually safer than most according to NeighborhoodScout's exclusive analysis of FBI crime data.


For Brooklyn, we found that the violent crime rate is one of the highest in the nation, across communities of all sizes (both large and small). Violent offenses tracked included rape, murder and non-negligent manslaughter, armed robbery, and aggravated assault, including assault with a deadly weapon. According to NeighborhoodScout's analysis of FBI reported crime data, your chance of becoming a victim of one of these crimes in Brooklyn is one in 178.


Moreover, the rate of property crime in Brooklyn; burglary, larceny ($50 or more), grand theft auto, and arson; is 15 per 1,000 residents. This is about average for all cities and towns in America of all population sizes.


总体而言，晚上尽量打车回去（如果地铁站离得很近也行），不要闲逛。