The following table shows all House of Assembly electorates to be contested at the 2026 state election, ordered according to two-candidate-preferred margin.
| Labor Seats | Liberal Seats | ||
| Seat | Margin | Seat | Margin |
| Dunstan | ALP 0.8% | Finniss | LIB 0.7% vs IND |
| Gibson | ALP 2.5% | Morialta | LIB 1.4% |
| Davenport | ALP 3.4% | Unley | LIB 2.2% |
| King | ALP 3.9% | Heysen | LIB 2.8% |
| Waite | ALP 4.0% | Flinders | LIB 3.0% vs IND |
| Newland | ALP 5.4% | Ngadjuri | LIB 3.4% |
| Elder | ALP 5.6% | Hartley | LIB 3.6% |
| Adelaide | ALP 6.2% | Morphett | LIB 4.5% |
| Black | ALP 9.9% | Colton | LIB 4.8% |
| Torrens | ALP 10.0% | Hammond | LIB 5.1% |
| Lee | ALP 11.5% | Bragg | LIB 8.2% |
| Wright | ALP 12.0% | Schubert | LIB 11.9% |
| Florey | ALP 12.8% | Chaffey | LIB 17.2% |
| Mawson | ALP 13.8% | MacKillop | LIB 22.6% |
| Enfield | ALP 14.5% | ||
| Badcoe | ALP 14.8% | ||
| Hurtle Vale | ALP 15.6% | ||
| Playford | ALP 16.3% | ||
| Giles | ALP 17.3% | ||
| Reynell | ALP 17.3% | ||
| Taylor | ALP 18.7% | ||
| West Torrens | ALP 18.8% | ||
| Cheltenham | ALP 19.1% | ||
| Kaurna | ALP 19.8% | ||
| Ramsay | ALP 19.9% | ||
| Light | ALP 20.1% | Narungga | IND 8.1% vs LIB |
| Elizabeth | ALP 21.3% | Mount Gambier | IND 13.1% vs LIB |
| Port Adelaide | ALP 21.8% | Stuart | IND 17.0% vs LIB |
| Croydon | ALP 24.8% | Kavel | IND 26.3% vs LIB |