Blog addresses are never recycled, but you can register for a custom domain.
Addresses (URLs) for blogs that have been deleted by the owner will remain deleted. We cannot, under any circumstances, allow someone to take over the address of a blog that was previously owned and deleted by its original/previous owner.
Fortunately, there is a nearly infinite supply of unused blog addresses – so our policy should not limit your address selection significantly. You can also register a custom domain for use with your blog so that the original ‘wordpress.com’ domain/URL is never visible to your readers.