The director of the Municipal Transportation Bureau and the county magistrate are from small to large, so we can't directly compare the sizes, because the level of the director of the Municipal Transportation Bureau and the level of the county magistrate depends on the specific area.

In China's administrative institutions, the director of the Municipal Transportation Bureau usually belongs to department-level cadres, and the county magistrate is also a department-level cadre. In some sub-provincial cities, the director of the Municipal Transportation Bureau may be the deputy department level, half as much as the county magistrate.

Therefore, it is impossible to simply compare the size of the director of the Municipal Transportation Bureau and the county magistrate, and it needs to be decided according to the specific city level.