is_*() »Conditional Tags« are wrappers for their
is_* pendants in the global
$wp_query object. They all reflect parts of the »Template Hierarchy« which determines which file should be loaded (if present) to display the request.
To make it short here're the most general:
is_archive() covers all Tag, Taxonomy, Category, Post Type (Post/Page/Attachments/links/Custom Post Type, etc.) archive pages (there's also
is_post_type_archive() to lock those out).
is_front_page() are basically the same, with the difference, that they distinguish the display setting for the front page: Latest posts & static front page.
is_singular() catches all "single" views, like a page, an attachment, a post, etc.
is_search() covers search result pages
is_404() catches everything ... that wasn't catched
So based on this list, you should be able to wrape up what you need - depending what "blog area pages" are for you.
As a little helper, you can use the functions from this answer that lists all conditionals that are
true on a request. This should help you getting around it pretty quick.
Just upload it as a plugin. Deactivate it when you're done.