See this page for more information, including links to some still-current sites elsewhere that may list Catholic dioceses.
A more up-to-date list of Catholic dioceses worldwide, and their websites, can be found on this page in Norway. (Some of the text is given in Norwegian, but there's enough English to be understandable.)
If you really need to see what was on my list of Catholic dioceses (keeping in mind that the list is by now seriously out of date), email spok+catholic@cs.cmu.edu to request a copy.