Harry Potter and the Sorcerer's Stone

Diagon Alley (London, UK)

Leaky Cauldron
Tiny, grubby-looking pub. Bartender: Tom.
Gringotts
Wizards bank. Snowy white building. Run by Goblins. Hundreds of miles under London. In vault 713 was the You-Know-What (the Sorcerer's Stone).
Flourish & Blotts
Sell school books.
Apothecary
Sell potion ingredients
Eeylops Owl Emporium
They sell owls. Hagrid buys Hedwig for Harry.
Ollivanders
Maker of Fine Wands since 382 BC.

People

Mrs. Finn
Mad, old lady; lives two streets away from Privet Drive; had lots of cats (Tribbles, Snowy, Mr. Paws, Tufty); Took Harry on special occasions. Her house smells of cabbage.
Nicolas Flamel
Was working with Dumbledore on alchemy. The only known maker of the Sorcerer's Stone. Alchemist and opera lover. Approx. 665 years old. Married to Perenelle Flamel (658 years old). Lives in Devon.
Sirius Black
Hagrid borrowed his motorcycle.
Dadelus Diggle
Tiny man in a violet top hat. Lives in Kent.
Madam Malkin
Owner of Madam Malkin's Robes for All Occasions. Squat witch dressed all in mauve.
Mr. Ollivander
Owner of Ollivanders. Old. Silvery eyes.

Places

Hog's Head
Pub down the village. Where Hagrid met the stranger and "won" the dragon egg.
Ministry of Magic
Make sure Muggles don't know about wizards. Cornelius Fudge is Minister.

Disclaimer: This is not an official Harry-Potter site. Harry Potter and the Sorcerer's Stone is copyright © 1997 by J. K. Rowling. Harry Potter and other characters are TM & © 2002 by Warner Bros. Did I miss anything?