Consider this: From the introduction of MFC until the introduction of the .NET framework, C++ was the preferred language for Windows development. So that should tell you something. Preferred by Microsoft that is, many developers still prefer it to .Net languages.
C++ is a language capable of systems level programming, but also due to the provision of extensive libraries it is used for applications programming also. I would guess that almost every application running on your Desktop PC was written in C++.
If you can get a library for anything, you can almost certainly get it for C++.
It is widely used in the games industry, and to some extent in the embedded systems domain.
So I would say - 'everywhere'. It is after all a 'general purpose' programming language.
