Isaac Region Population Population

| Year_ | Total_Region | Belyando | Broadsound | Nebo |
|---|---|---|---|---|
| 1933 | 4971 | 2987 | 1590 | 394 |
| 1947 | 5016 | 3067 | 1415 | 534 |
| 1954 | 5088 | 3104 | 1537 | 447 |
| 1961 | 5367 | 3253 | 1539 | 575 |
| 1966 | 5101 | 2997 | 1625 | 479 |
| 1971 | 7200 | 4834 | 1589 | 777 |
| 1976 | 11389 | 7210 | 3379 | 800 |
| 1981 | 15522 | 7700 | 6908 | 914 |
| 1986 | 22133 | 11362 | 8419 | 2352 |
| 1991 | 22188 | 11082 | 8472 | 2634 |
| 1996 | 20703 | 10755 | 7486 | 2462 |
| 2001 | 19013 | 9883 | 6601 | 2529 |
| 2006 | 19820 | 10455 | 6843 | 2522 |