Jofre,
As Sephe mentioned, it would help if you were a bit more specific, but in general, I would start with the municipality's web page and see if they have a "GIS" or "mapping" page where you can download what you need. It may be they have a service you can add to your project.
Also look/search at ArcGIS | Main and the gallery (see link at top of page.).
You can also do a search in your browser, but make sure to incluse some key words in your search including the municipality or state or area name. Expand this area if you do not find any data local. there may be more general data listed at the country level.