However, a range of data sources collated for a variety of purposes, and for different time periods, are able to provide some information about second homes and holiday homes.
Fodd bynnag, mae amrywiaeth o ffynonellau data a gasglwyd at amrywiaeth o ddibenion, ac am gyfnodau gwahanol o amser, yn gallu darparu rhywfaint o wybodaeth am ail gartrefi a chartrefi gwyliau.