If you're looking for statistics on the visitors to your site, I would first look at log analyzing software - which is probably something your server administrator would have to set up for you. An alternative is something like Google Analytics http://www.google.com/analytics/
For individual page counters from the early era of the web -- an image displaying the number of page hits, preferably in a '57 chevy odometer style --- there may be some services out there, but in the past you needed to have something on the server which would capture this for you. I think fewer people are using those as they don't provide an accurate number of visitors, just an accurate number of counter image downloads.
Hope that helps.