In chapter 1 of the book Silent Spring, the town is described as being "in the heart of America . . . in the midst of a checkerboard of prosperous farms." There are also hills with orchards where foxes roam, and there are lots of flowers and plants along the roads.
The town also has a "flood of migrants" passing through, pools and streams that people fish in, and a famously abundant "variety of . . . bird life." The author then describes how this idyllic town became decimated by a mysterious "white granular powder" so that the plants and flowers withered, the fish died in the streams, and the trees bore no fruit.
Later in the chapter, the author writes that "This town does not actually exist, but it might easily have a thousand counterparts in America." In other words, the town described in chapter 1 is meant to represent all of the towns in America. The town in this story is what's called a microcosm, meaning that it's a small-scale representation of something much bigger. The author uses this town as a microcosm to represent all of America so that the reader can better empathize with the decimation that has occurred and will occur through the use of pesticides. We can all, after all, probably imagine something more easily on a small scale than on a much larger scale.