There are no sworn translators in the United States. The profession of translator is not regulated and its practice does not require any validation of professional credentials.
There are, however, specific certifications for legal interprets in Federal courts (and in some state courts) but these certifications remain optional.
Likewise, the American Translators Association (ATA) delivers a certification that is generally considered a token of professionalism : https://www.atanet.org.
People who wish to use a certified translator based in France may use this directory : http://www.tti-network.com/annuaire-traducteur-assermente-france/