Firebaugh is a city in Fresno County, California, United States, on the west side of the San Joaquin River 38 miles west of Fresno. State Route 3…Firebaugh is a city in Fresno County, California, United States, on the west side of the San Joaquin River 38 miles west of Fresno. State Route 33 and the San Joaquin Valley Railroad, West Side Subdivision, pass through downtown. A small commercial district features the ubiquitous California Central Valley water tank painted with the city's name.