| Lonely (Clean) | 3:57 | |
| Lonely (Main) | 3:57 | |
| Lonely (Instrumental) | 3:57 | |
| Lonely (Clean) | 3:57 | |
| Lonely (Main) | 3:57 | |
| Lonely (Instrumental) | 2:57 |
| Title, Format | Label | Cat# | Country | Year | |
|---|---|---|---|---|---|
| Lonely (12") | Universal Records | B0004541-11 | US | 2005 | |
| Lonely (CD, Maxi, Enh) | Universal Records | 6024 988 188 9 3 | Europe | 2004 | |
| Lonely (CD, Single) | Universal Records | 6024 988 189 0 9 | 2004 | ||
| Lonely (CD, Single, Promo) | Universal Records | MCSTDJ40415 | Europe | 2004 | |
| Lonely (12") | Universal Records | MCST 40415 | UK | 2005 | |
| Lonely (CD, Maxi) | Universal Records | B0005049-32 | US | 2005 |