Defnyddir data manwl o'r cyfrifiad ar nodweddion y boblogaeth, gan gynnwys am nodweddion gwarchodedig a'r iaith Gymraeg, yn eang ar draws Llywodraeth Cymru a thu hwnt i ddeall canlyniadau gwahanol grwpiau o'r boblogaeth mewn ardaloedd bach, fel y gellir targedu gwasanaethau lle y mae eu hangen fwyaf. Mae'n hanfodol, felly, fod y system ystadegol yn parhau'n hollgynhwysol er mwyn iddi ddarparu tystiolaeth gadarn, gywir a manwl. Mae arnom angen tystiolaeth o’r fath fel y gellir ei defnyddio i helpu i sicrhau Cymru sy'n fwy cyfartal, Cymru o gymunedau cydlynus, ac iaith Gymraeg sy'n ffynnu.
Detailed census data on population characteristics, including about protected characteristics and the Welsh language, are widely used across the Welsh Government and beyond to understand the outcomes of different groups of the population at small areas, so that services can be targeted where they are most needed. It is critical, therefore, that the statistical system continues to be inclusive so that it provides us with robust, accurate and detailed evidence that can be used to help achieve a more equal Wales, a Wales of cohesive communities, and a thriving Welsh language.