def _compare_address_lists(list_one, list_two):
    """
    Counts the number of elements in list one that are not in list two.

    :param list_one: list of strings to check for existence in list_two
    :param list_two: list of strings to use for existence check of
        list_one parts

    :return: the count of items in list_one that are missing from list_two
    """
    diff = 0
    for part in list_one:
        if part not in list_two:
            diff += 1
    return diff