Knight of the Order of the White Eagle, awarded on 3 August 1758 in Warsaw.

From 1764 until 1767 Great Crown Chancellor and starost of Halicz, Lublin, Brodnica and Rostoki.

By 1780, under Zamoyski's direction, a code (Zbiór praw sądowych) had been produced.

It would have strengthened royal power, made all officials answerable to the Sejm, placed the clergy and their finances under state supervision, and deprived landless szlachta of many of their legal immunities.

Zamoyski's progressive legal code, containing elements of constitutional reform, failed to be adopted by the Sejm.