What should be done if you see that the map is wrong. Plus values are not matching correct homes.

The map is way off on our rural area road.The values are also matched to wrong addressses. Some residences have more than one residence on their property yet claim only one. There is one residence who actually had 3 residences however only claims a mobile home. There is actually for many years, a mobile home and a home on this property. They have in the past 2 years, torn down the mobile home and bulit another home from a large barn. Now there are 2 homes here. Another residence had just a mobile home and a small house on the property. This year, they tore down the ols mobile trailer and brought in a double wide mobile trailer. This also still has a small house. They claim only one old mobile trailer. It is the one they tore down. My question is? All these properties are zoned for one residence. Even if I am wrong, they are not listing how many residences and updates have been made to their properties. I have seen this up and down our road with many properties. Why is that? Shouldn't it be corrected and updated as far as the information and maps go. It looks like a real mess here and I wonder how many more ruralproperties do this. I just don't understand how the county monitors and updates if they don't even look at what changes have been made. This also affects those who are selling, as the area information is incorrect.