This was a decrease from 2011 when Neath Port Talbot had 59.5% of households with three bedrooms and Caerphilly had 59.1%.
Cafwyd y gyfradd gasglu uchaf y flwyddyn hon yng Nghastell-nedd Port Talbot (97.5%) a’r gyfradd gasglu isaf ym Mlaenau Gwent (91.0%).