// Add ID to categories overview
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);