How much does it cost to renew a french passport in the you.s. And where do I need to go for austin tx?

Here is what you do to renew your french passport in the United States: This is from the EHow website. There is a French Consulate in every major city in the US. You don't say where you are located, but this is the procedure:

Your French passport is valid until its expiration date. At that time, it is no longer valid for travel. Therefore, it is wise not to wait until the last minute to renew a passport. Volume can get very heavy during peak travel times. By anticipating the need and taking care of passport renewal in a timely manner, you will reduce your stress.
2

To renew a French passport in the United States, you must go to the French consulate. A French passport cannot be renewed via the Internet. Older passports are not machine-readable and replacement takes approximately three weeks. The consulate will return an older, still valid passport for the interim upon proof of emergency.
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To renew your passport you will need to present the old passport as well as some proof of status such as a green card, employment authorization form or a valid U.S. visa.
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You must include two recent passport photos. They can be in color or in black-and-white. The photos should be 50x50mm (2x2 inches) with your head in the center of the photograph.
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If the renewal is for a passport that expired more than two years ago, you must also provide one of the following: a valid French identity card or certificate or declaration of acquisition of French nationality, a naturalization certificate or the French long-form copy of your birth certificate.
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If, after you have appeared at the French consulate, you want your passport returned by mail, you must leave a prepaid (certified or FedEx), self-addressed envelope with the consulate.

Free France Fact Sheetwww.InternationalLiving.com