Sure, there are plenty. You can use the Stats widget, you can use Sitemeter or Statcounter (HTML-only versions) in a text widget, or you can use Whos.among.us, which I use to show how many people are on the blog at any given moment.
use a theme that already has one on it! its so much easyer because i found that alot of the widget ones dont work! The freshly theme definately has one already because thats what i use! hope that helps
I use “connection” as my theme and I am not sure if that’s part of it, but in my admin page, there a ‘stats’ feature which shows me how many visitors I have on any given day.
Would that be helpful to you?