Immigration attorney in Zihua ?

He/she should check with the closest US Consulate.

Asking for a friend, looking for an attorney who can advise person in Zihua on submitting documents to obtain a visa to enter USA.
Gracias

My take on the process is that having an attorney is simply an unnecessary expense. The process is simple and straightforward.

Here's the official U.S. government webpage regarding the process:
https://mx.usembassy.gov/es/visas-es/

Here are some of recommendations by some of Mexico's media:
¿Cómo tramitar la visa para viajar a Estados Unidos y cuál es su costo?

Visa americana: PASO a PASO cómo obtener la modalidad de turista (B1/B2)

¿Cómo tramitar la visa para visitar a Estados Unidos y cuánto cuesta?

Cómo tramitar tu visa en México para viajar a Estados Unidos: todo lo que debes saber