Geography thumb|Decoria Township Plat Map from the Standard Atlas, Blue Earth County, Minnesota According to the United States Census Bureau, the township has a total area of , of which is land and , or 0.05%, is water.
Geography thumb|Decoria Township Plat Map from the Standard Atlas, Blue Ea,rth County, Minnesota According to the United States Census Bureau, the township has a total area of , .of which is land and , or 0.05% is water