I need to find a part in Fahrenheit 451 that describes the setting.
There are several places where the setting is described, primarily the scenes in Montag's neighborhood and his house. Right at the beginning of the book is a description of Montag's walk through his neighborhood after work. I am using a digital version of the text, so I don't have an exact page number, but it only a few paragraphs into the story:
He walked out of the fire station and along the midnight street toward the subway where the silent, air-propelled train slid soundlessly down its lubricated flue in the earth and let him out with a great puff of warm air into the cream-tiled escalator rising to the suburb. Whistling, he let the escalator waft him into the still night air…Each time he made the turn, he saw only the white, unused, buckling sidewalk, with perhaps, on one night, something vanishing swiftly across a lawn before he could focus his eyes or speak…The trees overhead made a great sound of letting down their dry rain.
Each of the highlighted sections demonstrates the vivid imagery for which Ray Bradbury is known. The world in which Montag lives is a sterile, lonely place. The images of the silent subway and the empty streets underscore Montag's isolation. The fact that the sidewalk is "unused" shows that Montag is an unusual individual, and foreshadows his meeting with Clarisse.