Your property class code, and why it decides who you get compared to
The class determines the pool of comparable properties. A wrong class quietly ruins every comparison.
Every parcel carries a class code describing its use — improved residential, vacant residential, farmland, commercial, industrial, exempt. It is administrative, and it decides more than it looks like it does.
It selects your comparables
Uniformity arguments compare you to properties of the same class. If your house is coded as something else, you are being compared with the wrong pool and the comparison is meaningless in both directions.
Where it goes wrong
Newly built homes sometimes stay coded as vacant land for a cycle. A parcel that once had a shop can stay commercial after conversion. A property split or combined can inherit the wrong code. Land in a subdivision that has been built on can remain farmland until someone notices.
Why it can cut both ways
A wrong class is not automatically bad for you — farmland assessment is far lower than residential, and an incorrectly farm-coded lot is a benefit until it is corrected. Know which situation you are in before drawing attention to it.
Check it
Your class is on the notice and on the county parcel page. Compare it to a neighbour whose property is genuinely like yours. If they differ and the properties do not, ask the assessor why — that is a factual question with a factual answer, and it does not require an appeal to raise.