In 1744, East Frisia was annexed by Prussia. In 1867, the region was subdivided into districts, and the districts of Leer and Weener were established. In 1932, these two districts were merged.
The coat-of-arms is identical to the arms of the East Frisian chieftain dynasty Ukena, rulers of the area during the 15th century. Its blazon is: "Arms: Azure, a lion rampant dexter-facing Argent armed and langued Gules, collared by a wreath of leaves proper. Crown: two plumes of wheat Vert divided by a four-leaf clover proper at center."