Can an IP address be traced? I am being threatened?

[Joe]

You can trace the ISP to a degree. You can figure out the country (as long as there is no Proxy) and generally the city but any more than that will be unreliable. At that point you have to contact the ISP, and you may have to get further legal help in order to trace it to a name or address.

Other than calling or visiting the police station, I really don't know what to tell you.

You might want to sign up for LIfeLock (http://www.lifelock.com/). It is a phenomenal ID protection service that I personally use. That might clear it up, as they are pretty good at dealing with these kind of things.