If the property is in a subdivision, you should use the legal description, such as Lot ______, Castlewoods, Phase __________, Rankin County, MS.
If the property has a metes and bounds description, you may attach a copy of the legal description as an Exhibit to the contract and have the parties sign the legal description agreeing to incorporate it into the contract.
If you do not have either of the above descriptions, then an address or parcel number will usually suffice. However, DO NOT, for example, use a generic description like “two (2) acres subdivided from the Seller’s ten (10) acres,” as this is not specific enough to show a meeting of the minds.