You can delete your entire Tumblr account, or just a specific blog, through your account's "Edit appearance" menu.

You can easily delete your Yelp account if you no longer need to use it. When you delete the account, all content associated ...

If you have two Tumblr blogs attached to a single account, then you can delete one and keep the other. When you delete one Tumblr site you won't lose content from the other blog. This is helpful when ...