Zamoyski gathered a significant fortune; his estates generated a revenue of over 200,000 zloties in the early 17th century. His personal lands covered , and included eleven towns and over 200 villages. He was a royal caretaker of another dozen or so cities and over 600 villages. Totaled, his personal and leased lands covered over , with 23 towns and cities and 816 villages. In 1589 he succeeded in establishing the Zamoyski Family Fee Tail ("ordynacja zamojska"), a "de facto" duchy. Zamoyski supported economical development of his lands, investing in colonization of frontiers, and the development of industry, both small (sawmills, breweries, mills and such) and large (his lands had four iron mills and four glass factories).