Having in mind that you posted the question in the Developer forums (C::B DEVELOPMENT STRICTLY!), then it means you really want to connect Code::Blocks to Google Maps to show that information in the IDE itself. In that case, you will have to find out by yourself (most likely with the help of Google) how to do it, then you may examine any of the existing plugins to see how to integrate that into the IDE. As for the website, I have no idea what you mean.
If, on the other hand, you want to use Google Maps' API for your own purposes to develop an application on which you use Code::Blocks to write the code and compile it, then your question does not belong anywhere in the forums as it would be completely related to programming, and only programming, not Code::Blocks development (as in "specifically developing FOR Code::Blocks", NOT as in "general development WITH Code::Blocks").