Maycomb County 

Maycomb County was the fictional county in which the book was set.  Located in the deep south of the united states in Alabama, as the newspaper of Mobile County is referenced, Maycomb County is presumptively close to  it.  As Maycomb in the deep south, it borrows ideas from the south of America.  These ideas noticeably include: Racial segregation and Southern womanhood.   Interestingly, Maycomb is also the name of the town in which the book is set.
A Map of the counties of Alabama
A Map of the counties of Alabama