Widget Locationizer permits you to define where you want your widgets to appear.  You may specify

nickohrn

Widget Locationizer permits you to define where you want your widgets to appear. You may specify 
the tags, categories, and page/post IDs for which a widget will be displayed. It also provides an option 
to exclude the widget from being displayed on selected tags, categories, and post/page IDs. Furthermore, 
you can assign a nofollow or dofollow status for a widget’s contents too.
The following is how the plugin decides if a widget should show or not:
<ul>
<li>Is it a tag page and the tag is in the list of tags for which to show the widget? If so, show the widget.</li>
<li>Is it a category page and the tag is in the list of categories for which to show the widget? If so, show the widget.</li>
<li>Is the page a single page (a single post/page, basically)? If so, is the post/page ID contained in the list of post/page IDs that were entered (if any)? If so, show the widget.</li>
<li>Is the page a single page, no post/page IDs have been entered for the widget, and the Show on Other Pages option has been selected? If so, show the widget.</li>
<li>Is the page none of a tag page, category page, or single page and the Show on Other pages option has been selected? If so, show the widget.</li>
<li>Is the page a single page and is tagged or categorized with a tag or category from the list of tags or categories entered for the widget? If so, show the widget.</li>
<li>Otherwise, don’t show the widget</li>
</ul>
More Info
<ul>
<li><a href="http://tomuse.com/wordperss/widget-locationizer/" title="ToMuse.com Page for Widget Locationizer" rel="nofollow ugc">Widget Locationizer plugin</a></li>
<li>Check out the other plugins from <a href="http://tomuse.com/" title="ToMuse.com" rel="nofollow ugc">ToMuse.com</a> and <a href="https://wordpress.org/extend/plugins/profile/nickohrn" title="Plugin-Developer.com" rel="ugc">Nick Ohrn of Plugin-Developer.com</a></li>
</ul>
<h3>FAQs</h3>
<ol>
<li>How do I get a widget to display on my homepage? – Select ‘Yes’ for “Should this widget appear on all non-tag and non-category pages?”</li>
</ol>

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