You may have a different copy of the book than others, so you will need to find the page numbers in your copy yourself. However, the main quotes that describe Maycomb are in chapter 1. There are other chapters that give isolated information about the town as well, but the most important ones are in this opening chapter.
Maycomb is a town in Alabama. Because it is located in the South, the reader knows at the very beginning that racism is going to be an issue. The town is described as "old" and "tired." It is a place with sweltering heat that could wilt the collars of men's shirts, with rain that made the sidewalks look red (with mud). It is a town where grass grows on the sidewalks and where bony mules are hitched up outside the courthouse. The people are slow. There is no hurry. No one is really going anywhere. One gets the impression that the people are not too concerned with what is going on in the world outside of the south.
Read about it here on eNotes.
Beware of page numbers, as many of us use different editions and they may not match yours. This is information that I found looking in my resource:
Maycomb was an old town, but it was a tired old town when I first knew it. In rainy weather the streets turned to red slop; grass grew on sidewalks, the courthouse sagged in the square. Somehow, it was hotter then: a black dog suffered on a summer's day; bony mules hitched to Hoover carts flicked flies in the sweltering shade of the live oaks on the square. Men's stiff collars wilted by nine in the morning. Ladies bathed before noon, after their three-o'clock naps, and by nightfall were like soft teacakes with frostings of sweat and sweet talcum.
In Maycomb there was no hurry, for there was nowhere to go, nothing to buy and no money to buy it with, nothing to see outside the boundaries of Maycomb County. But it was a time of vague optimism for some of the people: Maycomb County had recently been told that it had nothing to fear but fear itself."
P. 293- about the people
"Neighbors bring food with death and flowers with sickness and little things in between. Boo was our neighbor. He gave us two soap dolls, a broken watch and chain, a pair of good-luck pennies, and our lives. But neighbors give in return. We never put back into the tree what we took out of it: we had given him nothing, and it made me sad."-
Hope it helps!