What passages in To Kill a Mockingbird describe where the jail, courthouse, post office, and bank are situated?

In Harper Lee's To Kill a Mockingbird, the post office is the very first building in the town square one would reach if one was heading into town from the Finches' residential street. We know this because, by Chapter 11, the children decide they should start walking into town to meet Atticus at the post office when he comes home from work. We also know, based on Scout's observations in the last chapter, that the post office can be seen from the Radley's porch, which is at the end of the Finches' street, to the south of the Finches.

We learn a bit about what the town square looks like based on Scout's descriptions in Chapter 15, when the three children walk into town at 10 o'clock at night to check up on Atticus. The children enter town by the post office and observe that the "south side of the square was deserted"; this tells us that the post office must be on the south side of the square. Scout further observes that a "light shone in the county toilet, otherwise that side of the courthouse was dark." This tells us that the courthouse must be positioned between the post office and the county toilet, all on the south side of the square--the side nearest the end of the Finches' residential street.

Scout further observes that a "larger square of stores surrounded the courthouse square." The Maycomb Bank building is situated in this larger square of stores. We know the bank cannot be seen from where the children first emerge by the post office because they have to go around the "corner of the square" to see Atticus's car parked in front of the bank; therefore, the bank must be just beyond the courthouse.

Also in Chapter 15, when the children don't find Atticus in his office in the bank building, they decide to try Mr. Underwood, editor and owner of The Maycomb Tribune, who lives above his own office. Scout notes that The Maycomb Tribune office is on the "northwest corner of the square," which places it opposite to the courthouse and to the west. Scout further notes that they "had to pass the jail" to reach Mr. Underwood's office; therefore the jail is positioned in the square nearer to the courthouse then Mr. Underwood's office. Scout further notes that the jail is "wedged between Tyndal's Hardware Store and The Maycomb Tribune office." In addition, when the lynch mob, led by Walter Cunningham Sr., arrives at the jailhouse in cars, the cars drive around the square, pass the bank, and stop at the jail. Therefore, from the end of the Finches' street, the jail can be reached by going around the courthouse and past the bank in a northerly direction, while walking along the west side of the square. Plus, when walking in a northerly direction along the west side of the square, Tyndal's Hardware store is reached just prior to the jail.