Ed and Heidi are both correct (Ed has given you the proper station info, as well). My only additional comment is that the Boston Police maintain a Community Relations Department to help with such questions - you will likely be directed to them.
State why you are asking/your concerns, and then ask how your specific area compares to others in the city (I think "relative to..." info is what you may be looking for?).
Also, obviously "crime" is a broad term...all places endure some kinds of crime - petty or not - as far as I know! You may be directed to a statistical database that analyzes patterns of different sorts of criminal events. That may be most helpful of all. It depends on your purposes.
The D4 station is easily accessible from St. James Street. You can always swing by and let them know what you are looking for, and ask the best way to meet your needs.
Best of luck!