Demonstration

The custom ID field

It’s useful so you don’t have to hover over the category title and look at the link to see the category ID.

Solution

Simply add the code bellow in your theme’s functions.php file.

function categoriesColumnsHeader($columns) {
	$columns['catID'] = __('ID');
	return $columns;
}

add_filter( 'manage_categories_columns', 'categoriesColumnsHeader' );

function categoriesColumnsRow($argument, $columnName, $categoryID){
	if($columnName == 'catID'){
		return $categoryID;
	}
}

add_filter( 'manage_categories_custom_column', 'categoriesColumnsRow', 10, 3 );

You might also want to check out how to do this for pages listing and how to do it for posts listing.

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