Sal Monilla wrote:I live in the Andersonville/Edgewater neighborhood. However, I've yet to discover where Andersonville ends and Edgewater begins! It almost seems to be an interchangeable designation.

It depends on whether you're buying or selling.
Edgewater is one of Chicago's 77 official Community Areas and thus has very specific defined borders that have remained unchanged for more than two decades. (Most of the CAs were defined in the 1920s, but Edgewater was split off from Uptown in the early 1980s.) Edgewater's official boundaries are Foster Avenue (5200N) north to Devon Avenue (6400N), and from the lakefront west to Ravenswood Avenue (1800W).
Andersonville, however, is just an informal designation for a neighborhood within Edgewater, and so its boundaries are fluid. It is technically correct to refer to any part of Andersonville as Edgewater, but the Andersonville name is considered more desirable, especially by people trying to sell property.
According to the Andersonville Chamber of Commerce, Andersonville is the section of Edgewater from Winnemac Avenue (5033N) north to Elmdale Avenue (6000N) and Magnolia Avenue (1234W) west to Ravenswood.
Other Edgewater neighborhoods include the Bryn Mawr Historic District, Edgewater Beach, Edgewater Glen, Edgewater Triangle, EPIC and Lakewood-Balmoral. There's been some effort to designate the area around Clark Street south of Foster Avenue as SoFo, but it isn't catching on.
Headcase, you'll find that Chicago is more neighborhood-centric than many cities, and most natives use either official Community Area names or generally recognized neighborhood names to designate where they live.
Here's the city's map of North Side Community Areas.