See redlining maps from Iowa cities
How to read a redlining map: A and B designations described neighborhoods with the lowest lending risk. These were predominantely white neighborhoods with higher property value. C and D neighborhoods represented a higher lending risk, and these areas were generally where Black or other minority populations lived.
What do the different colors mean?
best property values
It was more than just a map
Text descriptions known as "area descriptions" accompanied and explained the maps, often using racially loaded descriptions such as “infiltration of hazardous populations” or “invasion of hazardous groups” to describe neighborhoods. These documents then helped direct where home loans would be available.