There are times that you need to know the ID number of a page or post in WordPress and it can be more painful than it should be to find that number. This plugin does one simple thing: it displays the ID number of the page, post, category, or tag you are looking at in the WordPress Admin Bar. It appends this ID to the edit menu already on the Admin Bar. Needless to say, that means that this plugin is only useful for WordPress version 3.1 or above, since the Admin Bar was first introduced with 3.1.

Admin Bar ID Menu

Makes the ID number of the current page or post visible in the Admin Bar.

echoplugins

This plugin shows (reveals) IDs on admin screens that list posts, pages, custom post types and taxonomies, and others.
You can choose to display the ID in a new ‘ID’ column and/or under each row title after the ‘Edit | Quick Edit | View’ actions.
<h4>Features</h4>
<ul>
<li>
Choose where to display IDs:
<ul>
<li>in a new ‘ID’ column</li>
<li>under each row title beside the ‘Edit | Quick Edit | View’ actions</li>
</ul>
</li>
<li>
Reveal IDs in the following lists:
<ul>
<li>Posts</li>
<li>Pages</li>
<li>Categories</li>
<li>Tags</li>
<li>Comments</li>
<li>Custom post types</li>
<li>Custom taxonomies</li>
<li>Users</li>
<li>Media</li>
</ul>
</li>
</ul>
<blockquote>
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</blockquote>

Show IDs by Echo

Show IDs on admin pages for posts, pages, categories, taxonomies, custom post types and more.

Admin Bar ID Menu vs Show IDs by Echo