| ANRYLAMY | LEÓN |
| ANSELMO INTERNATIONAL MARKETS | LEÓN |
| ANSUREMA | LEÓN |
| ANTA MATERIALES Y PREFABRICADOS | LEÓN |
| ANTA MONTALVO | LEÓN |
| ANTEL COMERCIAL LEONESA | LEÓN |
| ANTELCO TELECOMUNICACIONES | LEÓN |
| ANTIBIOTICOS | LEÓN |
| ANTIBIOTICOS BIOTECHNOLOGIES | LEÓN |
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| ANTIBIOTICOS DE LEON | LEÓN |
| ANTOLIMA | LEÓN |
| ANTON CENTENO, ERNESTO 002459352Y | LEÓN |
| ANTONIO CAMPO | LEÓN |
| ANTONIO FERNANDEZ CASTELLANOS | LEÓN |
| ANTONIO FRANCO E HIJOS | LEÓN |
| ANTONIO GARCIA MARTINEZ | LEÓN |
| ANTONIO GONZALEZ MENDOZA | LEÓN |
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| ANTONIO GUTIERREZ MOTOR | LEÓN |
| ANTONIO TAPAS BERCIANAS | LEÓN |
| ANTRACITA REFORMAS INTEGRALES | LEÓN |
