Georgetown

Georgetown is a Washington, D.C. neighborhood located in the northern part of the city.

Location
Georgetown must be entered through the Metro system, but it is well connected. Easiest may be to enter it via the Tepid Sewer. (And it is also the most probable way you came to Georgetown, since you probably were hunting Molerats there.)

Radiation King
In the northwestern area is a Radiation King store, with a Scavenger.

Cornucopia Fresh Groceries
Next to the Radiation King is the Cornucopia Fresh Groceries, and next to that a Pulowski Preservation Shelter with a Nuka-Cola Quantum.

McClellan Family Townhome
Just about in the middle between Georgetown North and South you will find the McClellan Family Townhome. Inside, there is a rather moody Mr. Handy robot you can play around with using a nearby unprotected terminal. Modes of operation include reading the children a somewhat interesting bedtime poem (There Will Come Soft Rains, a post-apocalyptic poem from 1920, which is a reference to Ray Bradbury's short story of the same name), walking the dog, grocery shopping and home security. Using these modes you can enlist the robot's help in fighting the many super mutants in the area.
 * Skill Book: Lying, Congressional Style through door straight ahead on table in the townhome.
 * An interesting note: one of the options for the Mr. Handy is to "Walk Muffy." In the building containing Grognak the Barbarian I found a shaking and floating object that when selected read, "Search Muffy: EMPTY."

Sniper post
In a broken building in the center, quite close to and opposite to a balcony with a Super Mutant Master with a Missile Launcher, is a Raider corpse with a Sniper Rifle and ammunition for it.

La Maison Beauregard
In the southern area resides La Maison Beauregard. There is a U.S. Army: 30 Handy Flamethrower Recipes skill book inside. It is on the floor, behind a counter, in the first room on your left as you enter the building. There's also a bottle of Nuka-Cola Quantum on a shelf upstairs. There are also 3 missiles, 1 mini nuke, two stimpacks, and a Stealth Boy on the pool table upstairs. Crawling with Super Mutants.

Notable Loot
and it is on the floor behind the desk you will see.
 * Lying, Congressional Style in the McClellan Family Townhome (see above)
 * Grognak the Barbarian in blown up building directly west of the entrance to Tepid Sewers, on the second floor in a bookshelf.
 * Stealth Boy next to Grognak the Barbarian on the book shelf.
 * Nuka-Cola Quantum in the Pulowski Preservation Shelter next to Cornucopia Fresh Groceries (see above)
 * There are two Nuka-Cola Machines in Georgetown north that may contain Nuka-Cola Quantums
 * U.S Army: 30 Handy Flamethrower Recipes inside the La Maison Beauregard Lobby as soon as you enter turn left through a doorway

Video
Fighting some Super Mutant Masters in Georgetown North