Okla. Stat. tit. 19, § 19-299: Land parcel identifier system

The county assessor, county clerk and county treasurer of any

county may adopt a system of land parcel identifier numbers whereby

the same land identifier numbers shall be used by the county

assessor, county clerk and county treasurer to designate a tract of

real property situated within the county.

In any county where this system has been adopted, the county

clerk shall not accept for filing or recording any map, plat, deed,

mortgage, lease or other instrument affecting real property unless

the land parcel identifier numbers for all of the land parcels

described and affected are affixed on the face of the map, plat,

deed, mortgage, lease or other instrument. Provided that, failure

to comply with these provisions shall not affect the validity of any

such instrument that is duly recorded.