Iowa Constitution Art. III, § 39A. Counties home rule

Counties or joint county-municipal corporation governments are granted home rule power and authority, not inconsistent with the laws of the general assembly, to determine their local affairs and government, except that they shall not have power to levy any tax unless expressly authorized by the general assembly. The general assembly may provide for the creation and dissolution of joint county-municipal corporation governments. The general assembly may provide for the establishment of charters in county or joint county-municipal corporation governments.

If the power or authority of a county conflicts with the power and authority of a municipal corporation, the power and authority exercised by a municipal corporation shall prevail within its jurisdiction.

The proposition or rule of law that a county or joint county-municipal corporation government possesses and can exercise only those powers granted in express words is not a part of the law of this state.