The 200 block of West Marlin Street will be closed April 8, 9 or 10.
The county is replacing an air-conditioning chiller on the roof of the courthouse and a large crane will have to be brought in to place the unit.
The closure will start at 6 a.m. and last until about 3 or 4 p.m.
The day of the installation will depend on when the equipment is delivered.
The city also will close eight parking spaces Thursday in front of 115 N. Main St. for the removal of the neon Renberger Jewelers sign.
The parking stalls will be closed from 7:30 a.m. to noon.