WordPress Hit Counter (wordpress-hit-counter) free WordPress plugin

WordPress Hit Counter is a simple plugin that embeds a rotating odometer style hit counter on your blog showing how many visitors your site has.

The plugin allows you to choose from a number of different styles, it can be embedded in the footer or activated as a sidebar widget.
By default it will display in your footer, to change these settings simply activate it as a widget in your themes appearance section and change the options there.