Later the village belonged to the county Leonberg, after its extinction in 1319 the counts of Hals inherited the properties.

Until the administrative reform in Bavaria in 1818 Zeilarn belonged to the revenue office Landshut and the district court Eggenfelden.

Today's Zeilarn is the result of the consolidation under the local government reorganization in Bavaria in 1971.

Going by official statistics there were 243 employees subject to social insurance contributions in manufacturing industries and none in retail businesses.

In other economic sectors there were 46 employees subject to social insurance contributions.