[header] How to find old zoning codes [title] Acquire current property documents. [step] If you want to learn about the zoning history of a property, you typically need to know that property's parcel number or legal description, which can be found on the property's deed. [substeps] Deeds are recorded at the county clerk's office. 
You'll need the address of the property to get access to the deed. Some county clerks or recorders have electronic databases of property information that you can access online.