Demography
| Year | Population of Radyr | Change |
|---|---|---|
| 1801 | 196 | – |
| 1811 | 106 | -46% |
| 1821 | 128 | 21% |
| 1831 | 227 | 77% |
| 1841 | 279 | 23% |
| 1851 | 417 | 50% |
| 1881 | 519 | 24% |
| 1891 | 610 | 18% |
| 1901 | 816 | 34% |
| 1911 | 1,238 | 52% |
| 1921 | 1,634 | 32% |
| 1931 | 1,586 | -3% |
| 1951 | 1,568 | -1% |
| 1961 | 1,690 | 8% |
| 2001 | 4,658 | 176% |
| 2009 | 6,000 | 29% * |
According to the latest estimates, Radyr has a population of 6,000 people. The 2001 census showed that the suburb had a total population of 4,658, of which 2,268 are male and 2,390 are female. The average age of the population is 39.7 years. 68.27% of residents are married, with 20.81% having never married. 73.97% declared their religion as Christianity. 23.97% stated no religion and 0.9% stated Muslim. 96.02% stated their ethnicity as white, 1.76% as Asian, 1.03% as mixed race, 1.01% as Chinese, and 0.2% as Black. 15.5% are Welsh language speakers.
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