Tax Parcel Dataset Coverage
USLandGrid.com has a tax parcel database that includes all the major attributes including PID, owner name, mailing address, physical address, market value, tax zone, and many other attributes. They @USLandGrid now have over 3,000 counties of tax parcel data across the United States. All of Oklahoma was recently updated. The complete Oklahoma tax parcel dataset was just updated with 26+ attributes for each county.