The following table shows all Legislative Assembly electorates to be contested at the 2013 state election, ordered according to two-party-preferred margin.
| Liberal/National Seats | Labor Seats | ||
| Seat | Margin | Seat | Margin |
| Wanneroo | LIB 1.0% | Albany | ALP 0.2% |
| Mount Lawley | LIB 1.7% | Forrestfield | ALP 0.2% |
| Jandakot | LIB 1.8% | Kwinana | ALP vs IND 0.8% |
| Southern River | LIB 1.8% | Morley | ALP 0.8% |
| Riverton | LIB 2.0% | Balcatta | ALP 2.2% |
| Ocean Reef | LIB 2.7% | Joondalup | ALP 3.3% |
| Moore | NAT vs LIB 3.1% | Collie-Preston | ALP 3.8% |
| North West Central | NAT 3.3% | West Swan | ALP 4.1% |
| Eyre | LIB vs NAT 3.4% | Gosnells | ALP 4.8% |
| Swan Hills | LIB 3.5% | Belmont | ALP 6.7% |
| Kingsley | LIB 4.6% | Girrawheen | ALP 6.7% |
| Scarborough | LIB 5.1% | Kimberley | ALP 6.8% |
| Kalamunda | LIB 6.3% | Pilbara | ALP 7.2% |
| Darling Range | LIB 7.0% | Perth | ALP 7.7% |
| Geraldton | LIB 8.5% | Midland | ALP 8.3% |
| Murray-Wellington | LIB 8.8% | Maylands | ALP 8.8% |
| Bateman | LIB 9.4% | Cannington | ALP 9.0% |
| Warren-Blackwood | NAT vs LIB 10.2% | Victoria Park | ALP 9.0% |
| Bunbury | LIB 11.1% | Cockburn | ALP 9.2% |
| Dawesville | LIB 11.1% | Warnbro | ALP 10.1% |
| Carine | LIB 12.7% | Bassendean | ALP 10.3% |
| Hillarys | LIB 12.9% | Butler | ALP 10.4% |
| South Perth | LIB 14.3% | Mandurah | ALP 10.5% |
| Nedlands | LIB 16.6% | Rockingham | ALP 11.4% |
| Vasse | LIB 17.8% | Mirrabooka | ALP 12.9% |
| Central Wheatbelt | NAT vs LIB 18.8% | Armadale | ALP 14.8% |
| Cottesloe | LIB 19.4% | Willagee | ALP 15.0% |
| Wagin | NAT vs LIB 28.4% | ||
| Crossbench Seats | |||
| Alfred Cove | IND vs LIB 0.2% | ||
| Kalgoorlie | IND vs NAT 3.6% | ||
| Fremantle | IND vs ALP 4.0% | ||
| Churchlands | IND 22.5% | ||