There are 40 chapters overall for the main game.
They are as followed:

Chapter 1 - The Lighthouse
Chapter 2 - Welcome Center
Chapter 3 - Raffle Square
Chapter 4 - Comstock Center Rooftops
Chapter 5 - Monument Island Gateway
Chapter 6 - Monument Tower
Chapter 7 - Battleship Bay
Chapter 8 - Soldier's Field
Chapter 9 - Hall of Heroes
Chapter 10 - Inside the Hall of Heroes
Chapter 11 - Hall of Heroes Gift Shop
Chapter 12 - Return to Hall of Heroes
Chapter 13 - Finkton Docks
Chapter 14 - Beggar's Wharf
Chapter 15 - Fort Franklin Pier
Chapter 16 - Worker Induction Center/Finkton Proper
Chapter 17 - Plaza of Zeal
Chapter 18 - The Good Time Club
Chapter 19 - Return to Plaza of Zeal
Chapter 20 - Gunsmith's Shop
Chapter 21 - Shantytown
Chapter 22 - Bull House Impound
Chapter 23 - Bull Yard
Chapter 24 - Finkton Proper
Chapter 25 - On to the Factory
Chapter 26 - Factory Courtyard
Chapter 27 - The Factory
Chapter 28 - Emporia
Chapter 29 - Port Prosperity
Chapter 30 - Downtown Emporia
Chapter 31 - Memorial Gardens
Chapter 32 - Comstock House
Chapter 33 - The Atrium
Chapter 34 - Warden's Office
Chapter 35 - Operating Theatre
Chapter 36 - Hand of the Prophet
Chapter 37 - Hangar Deck
Chapter 38 - Engineering Deck
Chapter 39 - Command Deck - (there is a final battle here)
Chapter 40 - Sea of Doors - epilogue

Chapter 1 - Dewitt Investigation
Chapter 2 - Market Street
Chapter 3 - Arrived at Fontaine's Station
Chapter 4 - The Pavilion - First floor
Chapter 5 - Housewares

Chapter 1 - La Poche Du Temps Cafe
Chapter 2 - Toy Department
Chapter 3 - Columbia
Chapter 4 - Return to Rapture
Chapter 5 - The Room
Chapter 6 - Entering Suchong's Free Clinic

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