|
| Local Government Area | Estimated resident population | Median age | Median age | Median age |
 | at June 2006 (preliminary) | at June 1996 | at June 2001 | at June 2006 (preliminary) |
|
| Adelaide (C) | 17 723 | 33.1 | 35.3 | 31.9 |
| Adelaide Hills (DC) | 39 601 | 35.9 | 38.1 | 40.2 |
| Alexandrina (DC) | 21 505 | 39.8 | 42.5 | 44.9 |
| Anangu Pitjantjatjara (AC) | 2 204 | 23.6 | 25.3 | 26.9 |
| Barossa (DC) | 21 407 | 36.9 | 38.8 | 40.0 |
| Barunga West (DC) | 2 626 | 42.7 | 44.6 | 46.9 |
| Berri and Barmera (DC) | 11 366 | 35.6 | 37.5 | 39.1 |
| Burnside (C) | 43 902 | 41.1 | 42.6 | 43.1 |
| Campbelltown (C) | 47 941 | 36.7 | 38.8 | 39.8 |
| Ceduna (DC) | 3 672 | 31.6 | 33.3 | 35.6 |
| Charles Sturt (C) | 104 069 | 38.2 | 39.7 | 40.8 |
| Clare and Gilbert Valleys (DC) | 8 525 | 37.6 | 40.3 | 42.0 |
| Cleve (DC) | 1 988 | 36.4 | 39.2 | 39.4 |
| Coober Pedy (DC) | 1 996 | 35.9 | 39.3 | 44.3 |
| Copper Coast (DC) | 11 888 | 42.0 | 44.1 | 45.9 |
| Elliston (DC) | 1 175 | 35.1 | 38.0 | 38.4 |
| Flinders Ranges (DC) | 1 783 | 36.8 | 40.8 | 45.2 |
| Franklin Harbour (DC) | 1 322 | 40.9 | 40.3 | 43.5 |
| Gawler (T) | 19 406 | 35.4 | 37.9 | 39.3 |
| Goyder (DC) | 4 327 | 37.8 | 40.9 | 43.0 |
| Grant (DC) | 8 193 | 35.1 | 37.4 | 38.9 |
| Holdfast Bay (C) | 34 704 | 43.3 | 44.2 | 44.8 |
| Kangaroo Island (DC) | 4 446 | 37.5 | 39.8 | 43.3 |
| Karoonda East Murray (DC) | 1 212 | 38.4 | 40.2 | 44.4 |
| Kimba (DC) | 1 159 | 37.3 | 39.1 | 42.0 |
|
| Local Government Area | Estimated resident population | Median age | Median age | Median age |
 | at June 2006 (preliminary) | at June 1996 | at June 2001 | at June 2006 (preliminary) |
|
| Kingston (DC) | 2 418 | 38.4 | 40.2 | 43.6 |
| Le Hunte (DC) | 1 370 | 34.6 | 37.1 | 38.0 |
| Light (RegC) | 12 846 | 34.6 | 36.8 | 36.6 |
| Lower Eyre Peninsula (DC) | 4 577 | 36.0 | 38.0 | 40.0 |
| Loxton Waikerie (DC) | 12 101 | 36.2 | 38.2 | 40.6 |
| Mallala (DC) | 8 236 | 32.7 | 35.0 | 37.2 |
| Maralinga Tjarutja (AC) | 105 | 27.7 | 27.5 | 32.3 |
| Marion (C) | 81 430 | 37.7 | 39.4 | 39.6 |
| Mid Murray (DC) | 8 325 | 39.5 | 42.0 | 45.6 |
| Mitcham (C) | 64 282 | 39.2 | 40.5 | 40.5 |
| Mount Barker (DC) | 27 612 | 33.5 | 35.1 | 36.3 |
| Mount Gambier (C) | 24 494 | 32.7 | 34.8 | 36.3 |
| Mount Remarkable (DC) | 2 937 | 39.0 | 42.5 | 45.9 |
| Murray Bridge (RC) | 18 364 | 34.9 | 37.2 | 39.1 |
| Naracoorte and Lucindale (DC) | 8 481 | 35.5 | 36.9 | 37.7 |
| Northern Areas (DC) | 4 843 | 36.9 | 40.3 | 43.3 |
| Norwood Payneham St Peters (C) | 35 255 | 36.6 | 38.4 | 38.7 |
| Onkaparinga (C) | 154 417 | 32.9 | 35.4 | 37.1 |
| Orroroo/Carrieton (DC) | 968 | 38.7 | 43.0 | 46.9 |
| Peterborough (DC) | 1 968 | 39.2 | 42.6 | 45.8 |
| Playford (C) | 71 903 | 31.3 | 32.8 | 34.2 |
| Port Adelaide Enfield (C) | 106 373 | 36.8 | 38.3 | 38.4 |
| Port Augusta (C) | 14 262 | 32.7 | 35.4 | 36.5 |
| Port Lincoln (C) | 14 245 | 33.8 | 34.8 | 36.3 |
| Port Pirie City and Dists (M) | 17 776 | 36.2 | 38.4 | 40.4 |
|
| Local Government Area | Estimated resident population | Median age | Median age | Median age |
 | at June 2006 (preliminary) | at June 1996 | at June 2001 | at June 2006 (preliminary) |
|
| Prospect (C) | 20 063 | 35.0 | 36.2 | 36.2 |
| Renmark Paringa (DC) | 9 861 | 35.3 | 36.9 | 39.1 |
| Robe (DC) | 1 436 | 39.4 | 40.4 | 43.0 |
| Roxby Downs (M) | 4 292 | 27.0 | 28.2 | 29.3 |
| Salisbury (C) | 122 163 | 31.1 | 33.5 | 34.9 |
| Southern Mallee (DC) | 2 247 | 36.8 | 37.8 | 40.5 |
| Streaky Bay (DC) | 2 128 | 36.6 | 38.4 | 41.1 |
| Tatiara (DC) | 7 194 | 33.9 | 35.2 | 37.3 |
| Tea Tree Gully (C) | 99 461 | 33.4 | 35.6 | 37.6 |
| The Coorong (DC) | 5 865 | 35.4 | 38.5 | 40.5 |
| Tumby Bay (DC) | 2 640 | 40.0 | 44.2 | 46.7 |
| Unley (C) | 37 826 | 36.3 | 38.1 | 38.7 |
| Victor Harbor (C) | 12 489 | 46.8 | 50.7 | 53.6 |
| Wakefield (DC) | 6 642 | 36.8 | 40.0 | 41.6 |
| Walkerville (M) | 7 280 | 42.5 | 43.3 | 44.3 |
| Wattle Range (DC) | 12 399 | 34.9 | 37.4 | 38.9 |
| West Torrens (C) | 54 371 | 37.7 | 38.8 | 38.6 |
| Whyalla (C) | 22 332 | 32.0 | 35.4 | 36.9 |
| Yankalilla (DC) | 4 327 | 40.5 | 43.8 | 48.1 |
| Yorke Peninsula (DC) | 11 581 | 43.4 | 46.1 | 49.2 |
| Unincorporated SA | 3 879 | 30.6 | 31.2 | 37.7 |
 |  |  |  |  |
| Total South Australia | 1 568 204 | 35.6 | 37.6 | 38.7 |
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| (DC) District Council |  |  |  |  |
| (M) Municipality |  |  |  |  |
| (RegC) Regional Council |  |  |  |  |
| (RC) Rural City |  |  |  |  |
| (T) Town |  |  |  |  |