What is the speed limit in a residential area in Iowa unless otherwise posted?

In Iowa, the default speed limit in residential areas is set at 25 miles per hour unless a different limit is posted. This speed limit is established to ensure the safety of residents, particularly children and pets, who may be present. Lower speed limits in residential zones help reduce the severity of accidents, allowing drivers more reaction time to avoid collisions. While some locations may post lower speed limits to account for factors like heavy pedestrian traffic or school zones, the 25 mph limit serves as the standard guideline for these areas to promote a safe driving environment.