Hello Amy, I have parcels in Marshall County also under lease. If you have a lease the parcel numbers should be listed in the document. You can then go to the Marshall County GIS site and search in the district and enlarge the scale until parcel numbers appear. If it is from county tax records those numbers do not yield a map parcel number that can be traced to the parcel map that I know of. If you could supply the format of the numbers you have it might help. A search of the public records shows a lease for Hill, Amy Parry in Webster District. If that is you the parcel numbers are listed in the lease document.