All 7 Uses

although
in
To Kill a Mockingbird
(Edited)

Once the town was terrorized by a series of morbid nocturnal events: people's chickens and household pets were found mutilated; although the culprit was Crazy Addie, who eventually drowned himself in Barker's Eddy, people still looked at the Radley Place, unwilling to discard their initial suspicions.
p. 9.8

although = even though
Jem said quietly, "My sister ain't dirty and I ain't scared of you," although I noticed his knees shaking.
p. 122.3

although = but (used to connect contrasting ideas)
Although her fits had passed off, she was in every other way her old self: when Sir Walter Scott became involved in lengthy descriptions of moats and castles, Mrs. Dubose would become bored and pick on us: "Jeremy Finch, I told you you'd live to regret tearing up my camellias."
p. 125.9

although = even though
Although Maycomb was ignored during the War Between the States, Reconstruction rule and economic ruin forced the town to grow.
p. 148.9
Although we heard no more about the Finch family from Aunt Alexandra, we heard plenty from the town.
p. 153.1
He was a man learned in the law, and although he seemed to take his job casually, in reality he kept a firm grip on any proceedings that came before him.
p. 187.7 *
Although his back was to us, we knew he had a slight cast in one of his eyes which he used to his advantage: he seemed to be looking at a person when he was actually doing nothing of the kind, thus he was hell on juries and witnesses.
p. 189.7

Definitions:

(1) (although)
even though -- used to introduce an idea that contrasts with or makes the main statement surprising

At the start of a sentence, although can play a role similar to words like however, yet, still, even so, on the other hand, or nonetheless—all of which signal contrast. In the middle of a sentence, although can sometimes be used where but or though might also work, but though or but often sound more natural. For example, "She's a great teacher, though not the most popular" is usually smoother than "She's a great teacher, although not the most popular."
(2) (meaning too rare to warrant focus)