Metroid Prime/Missile Expansions

There are 50 Missile Expansions in the game, including the Missile launcher itself. If you get all of them you missile capacity will be 250.

Tallon Overworld
Subtotal: 9
 * Transport Tunnel B (1)
 * Landing Site (1)
 * Overgrown Cavern (1)
 * Frigate Crash Site (1)
 * Biohazard Containment (1)
 * Life Grove Tunnel (1)
 * Great Tree Chamber (1)
 * Root Cave (1)
 * Arbor Chamber (1)

Chozo Ruins
Subtotal: 19
 * Hive Totem (1) – Missile Launcher
 * Ruined Gallery (2)
 * Burn Dome (1)
 * Watery Hall Access (1)
 * Dynamo (2)
 * Vault (1)
 * Ruined Nursery (1)
 * Main Plaza (2)
 * Ruined Shrine (2)
 * Ruined Fountain (1)
 * Gathering Hall (1)
 * Crossway (1)
 * Furnace (1)
 * Watery Hall (1)
 * Training Chamber Access (1)

Magmoor Caverns
Subtotal: 3
 * Storage Cavern (1)
 * Fiery Shores (1)
 * Triclops Pit (1)

Phendrana Drifts
Subtotal: 9
 * Research Lab Aether (1)
 * Research Lab Hydra (1)
 * Ice Ruins East (2)
 * Phendrana Shorelines (2)
 * Quarantine Monitor (1)
 * Frost Cave (1)
 * Gravity Chamber (1)

Phazon Mines
Subtotal: 9
 * Main Quarry (1)
 * Elite Research (1)
 * Elite Control Access (1)
 * Security Access A (1)
 * Metroid Quarantine A (1)
 * Fungal Hall Access (1)
 * Fungal Hall B (1)
 * Metroid Quarantine B (1)
 * Phazon Processing Center (1)