Function to add your custom taxonomy as a column in the All Posts view of a custom post type (where "location" is the custom post type and "state" is the taxonomy).

cpt-tax-column.php

<?php

add_filter('manage_location_posts_columns' , 'add_post_columns');
add_action( 'manage_location_posts_custom_column' , 'state_column', 10, 2 );

function add_post_columns($columns) {
    $columns['state'] = 'State/Territory';
    return $columns;
}

function state_column( $column, $post_id ) {
    switch ( $column ) {

        case 'state' :
            $terms = get_the_term_list( $post_id , 'state' , '' , ',' , '' );
            if ( is_string( $terms ) )
                echo $terms;
            else
                echo '';
            break;

    }
}