One document required for marriage in France is an affidavit of marital status (certificate of celibacy) less than 3 months old. It can be done in the form of a notarized affidavit executed before an American Consular office in France.
Para su conveniencia, debajo del texto en español le brindamos la versión completa de este formulario en inglés. For your convenience, the complete English version of this form is attached below the Spanish version.