You can get reports from the Metro DC Police department and you can also talk to the neighbors in the area. There is nothing like getting information directly from the source.
Here are some websites you may want to consider:
Exit Landmark Realty
Safety can be a concern in most areas within the Washington DC area, however it's best to understand urban cities such as Washington DC have crime throughout the city. Crime occurs even in areas where some wouldn't expect it. Your best bet will be to contact the Metropolitan Police Department on their non-emergency phone number and ask. You can also use the crime map: http://crimemap.dc.gov/
Tony Taylor, DC Real Estate Guy
The police department is a good place to start for digging up neighborhood crime statistics, but I would advise that you don't make the mistake of making your decision based only on those numbers.