Definition of star route in English:

star route

noun

US
  • A postal delivery route served by a private contractor.

    • ‘From about 1817 to 1890, records of various mail and star routes are contained in the Serial Set.’
    • ‘The saving, therefore, is on fourth-class offices and star routes discontinued.’
    • ‘By 1880, there were nearly 10,000 star routes, costing the federal government nearly $6 million a year to maintain.’

Origin

From the use of a star or asterisk to mark the routes in postal records.