| Gran Bretagna | Scuderia Ambrosiana | 5 | MURRAY David | 4CLT/48 | Maserati | 18 | ab |
| | Scuderia Ambrosiana | 6 | HAMPSHIRE David | 4CLT/48 | Maserati | 16 | 9 |
| | Privato | 10 | SHAWE-TAYLOR Brian | 4CL | Maserati | | 10 |
| | Privato | 10 | FRY Joe | 4CL | Maserati | 20 | 10 |
| | Officine Alfieri Maserati | 19 | CHIRON Louis | 4CLT/48 | Maserati | 11 | ab |
| | Enrico Platé | 20 | de GRAFFENRIED Emmanuel | 4CLT/48 | Maserati | 8 | ab |
| | Enrico Platé | 21 | BIRA Prince | 4CLT/48 | Maserati | 5 | ab |
| Monaco | Scuderia Achille Varzi | 2 | GONZALEZ Jose-Froilan | 4CLT/48 | Maserati | 3 | ab |
| Scuderia Achille Varzi | 4 | PIAN Alfredo | 4CLT/48 | Maserati | 19 | np |
| | Officine Alfieri Maserati | 44 | ROL Franco | 4CLT/48 | Maserati | 17 | ab |
| | Officine Alfieri Maserati | 48 | CHIRON Louis | 4CLT/48 | Maserati | 8 | 3 |
| | Enrico Platé | 50 | BIRA Prince | 4CLT/48 | Maserati | 15 | 5 |
| | Enrico Platé | 52 | de GRAFFENRIED Emmanuel | 4CLT/48 | Maserati | 12 | ab |
| Indianapolis | Indianapolis Race Cars | 10 | VUKOVICH Bill | 8CTF | Maserati | | nq |
| Indianapolis Race Cars | 12 | BANKS Henry | 8CTF | Offenhauser | 21 | 25 |
| | Fadely-Anderson/R.A. Cott | 21 | WEBB Spider | 8CTF | Offenhauser | 14 | 20 |
| Federal Engineering | 39 | KLADIS Danny | 8CTF | Maserati | | nq |
| George Hoster Inc. | 84 | BURCH Mike | 8CTF | Maserati | | nq |
| Coast Grain | 85 | AYULO Manuel | 8CTF | Offenhauser | | nq |
| Coast Grain | 85 | RIGSBY Jim | 8CTF | Offenhauser | | nq |
| Svizzera | Scuderia Achille Varzi | 2 | PAGANI Nello | 4CLT/48 | Maserati | 15 | 7 |
| Scuderia Achille Varzi | 2 | GONZALEZ Jose-Froilan | 4CLT/48 | Maserati | forfait | |
| | Officine Alfieri Maserati | 26 | CHIRON Louis | 4CLT/48 | Maserati | 16 | 9 |
| Officine Alfieri Maserati | 28 | ROL Franco | 4CLT/48 | Maserati | forfait | |
| | Enrico Platé | 30 | BIRA Prince | 4CLT/48 | Maserati | 8 | 4 |
| | Enrico Platé | 32 | de GRAFFENRIED Emmanuel | 4CLT/48 | Maserati | 11 | 6 |
| Scuderia Ambrosiana | 36 | PARNELL Reg | 4CLT/48 | Maserati | forfait | |
| | Privato | 40 | BRANCA Toni | 4CL | Maserati | 17 | 11 |
| Belgio | Privato | 30 | BRANCA Toni | 4CL | Maserati | 13 | 10 |
| Francia | Officine Alfieri Maserati | 28 | ROL Franco | 4CLT/48 | Maserati | 7 | ab |
| | Officine Alfieri Maserati | 30 | CHIRON Louis | 4CLT/48 | Maserati | 14 | ab |
| | Scuderia Ambrosiana | 32 | PARNELL Reg | 4CLT/48 | Maserati | 12 | ab |
| | Scuderia Ambrosiana | 34 | HAMPSHIRE David | 4CLT/48 | Maserati | 18 | ab |
| | Scuderia Achille Varzi | 36 | GONZALEZ Jose-Froilan | 4CLT/48 | Maserati | 8 | ab |
| Scuderia Achille Varzi | 38 | COMOTTI Franco | 4CLT/48 | Maserati | forfait | |
| Italia | Officine Alfieri Maserati | 6 | CHIRON Louis | 4CLT/48 | Maserati | 19 | ab |
| | Officine Alfieri Maserati | 20 | ROL Franco | 4CLT/48 | Maserati | 9 | ab |
| Privato | 20 | DE FILIPPIS Luigi | 4CLT/48 | Maserati | forfait | |
| Scuderia Ambrosiana | 26 | PARNELL Reg | 4CLT/48 | Maserati | forfait | |
| | Privato | 28 | PIETSCH Paul | 4CLT/48 | Maserati | 27 | ab |
| | Enrico Platé | 30 | BIRA Prince | 4CLT/48 | Maserati | 15 | ab |
| | Enrico Platé | 38 | de GRAFFENRIED Emmanuel | 4CLT/48 | Maserati | 17 | 6 |
| | Scuderia Ambrosiana | 50 | MURRAY David | 4CLT/48 | Maserati | 24 | ab |
