Go to Campaigns.
In the search bar at the top of the page you can find back the Campaigns that you have created. You will search for Campaign names, so make sure to give your Campaigns a recognizable name.
To see the details of that Campaign, click on the Campaign. You'll get a complete overview of your send campaign. The overview will show you:
In the Campaign analytics you can see how many recipients there were, and how many were removed due to duplication, or because they have opted out.
Furthermore you can see how the Campaign performed.
At the bottom of the page you can see the same information split out per country of the recipients in a table format.