How do I find where a key goes in MW4 DMZ?

Read the key's description. When it gives a Tac-Map grid square, such as I4, use that as your search area. Letters run west to east and numbers run north to south, so find that square on the Tac-Map and search it for the locked door.

Where do keys come from?

Keys come from several routes, including equipment kits earned through DMZ levels, reported Story Mission rewards and Lieutenant drops. Check the exact key: the Level 19 and 46 Recon Equipment Kits contain different keys.

How do I find the right door for a key?

Use the key's page to match its name to the room before travelling. Some exact doors and ways to obtain keys remain unconfirmed.

MW4 DMZ keys guide: loot rooms, Lieutenant keys and grid codes

Find the key’s exact name first, then check the matching room below. A Gun Store key, a Black Market key and the casino’s Counting Room key open different locks. Finding a similar-looking building is not enough.

Already have a key? Use the Key Finder to search its name and check any recorded door or acquisition details. Keep reading for equipment-kit rewards, room directions and the differences between similar locks.

Get keys from level-up kits

For a focused kit-to-room checklist, use the Gun Store and Black Market Weapons Locker guide. It separates the known Gun Store basement references from the Hanrim Village Black Market entrance.

Claim earned kits at Survival Kits in the FOB and check their contents before deploying.

Key	Kit and DMZ level	Where to use it
Gun Store Weapons Locker Key	Explosives Equipment Kit at 16; Trap Equipment Kit at 42	Three locked cabinets in a gun-store basement; first location, second location
Police Station Key	Recon Equipment Kit at 19	The exact matching station and door are not confirmed here
Black Market Weapons Locker Key	Recon Equipment Kit at 46	Hanrim Village shop stockroom, behind the counter through green double doors

The two Recon Equipment Kit rewards contain different keys. The Level 19 kit supplies the Police Station Key; the Level 46 kit supplies the Black Market Weapons Locker Key. The Gun Store basement markers are not Black Market locker locations.

Other acquisition routes include Lieutenant drops and Story Mission rewards. Use the individual key pages for the routes recorded for each key; keys are not guaranteed to come from the same source.

Read the description before travelling

Match the full key name to the lock you want to open.
If the description gives a grid square, find it on the Tac-Map. Letters run west to east; numbers run north to south.
Read the floor or entrance direction. A basement parking room and a main-floor vault can be in the same building.
Use the interactive map to plan the approach, then check your live Tac-Map for current hazards and extraction.

A grid square identifies a search area, not an exact door. Where a key description and an area page use different grid labels, follow the key’s current in-game description and check the entrance directions.

Casino keys: which vault is which?

Use the Counting Room Vault entrance walkthrough for the main-floor Cashier route.

Lock	Where to look
Counting Room Vault	Behind the Cashier shopfront on the main floor of Heavenly Luck Casino; map marker
Vault Armory	Small armory in the casino’s underground parking; map marker
Silent Ledger mission vault	Follow the generator, penthouse security camera and basement drill objectives in the Silent Ledger walkthrough

The Counting Room Vault key does not replace the mission’s basement drill sequence. Finish the Story Mission using its objective tracker, rather than searching for a key to bypass it.

B1 B2 Parking elevator leading to Silent Ledger's basement mission vault — The basement mission route. The Counting Room Vault is a separate main-floor room.

Room directions by key

These are recorded entrance directions. Check the key’s current description when you arrive; a reference position does not guarantee loot or an available key in your deployment.

Key or room	Search here
Executive Arms Auction	Top of DBN Headquarters in The Grid
Netshin IT Room	Upper-floor server room in Netshin Tech Complex, The Grid
Iskra’s Control Room	Upstairs in the broadcast building at Cheonwang Peak Array; map marker
Mirae Electrical Room	Northwestern basement parking garage at Mirae General Hospital; follow the B2 door walkthrough
The Chemist’s Secure Armory	Secured bunker near the Haneul Nuclear Reactor boat house; key description lists I4
Reactor DRC Locker	Reactor 02’s irradiated pool at Haneul Nuclear Reactor; prepare radiation protection
Air Base DRC Weapons Locker	Secure armory deep inside the Chang-san Air Base bunker
The Citadel South Wing	South wing of The Citadel inside the 14th Political Prison
Imjin Mill Foreman’s Office	First floor of the rice mill in Imjin Farmland
Haksan School Armory	Upstairs in the school northeast of the Re-Education Center
Re-Education Center Annex	Ground-floor annex of the Re-Education Center
Traindepot Storageroom	Basement of the train station near the fire department in Cheongun Village
Shop Records Room	Above Goh24 supermarket, south of the Clinic in Wolves Stadium
Police Weapon Depository	Auxiliary armory north of the Police Station in Wolves Stadium
Bank Branch Vault Access	Currency-storage rooms in South Korean bank branches; a specific entrance is not marked here
The Doctor’s Command Office	Converted conference room in Mirae General Hospital’s upper-floor offices, F5; look for the wooden double office doors
Field Depot	First-floor gear maintenance room in the military supply warehouse northeast of the Clinic at Chang-san Air Base; map marker

For Gun Store basements and the two casino key rooms, use the tables above. Field Depot is a room marker; a dedicated key entry is not listed here.

More keys with usable destinations

Key	Where to go
Black Market Weapons Locker	Hanrim Village shop: behind the counter, through green double doors to the named stockroom locker
Coin Mining Den	NuriGO West, grey office door beside a red fire alarm; landing 3 and OFFICE sign are reported directions
Roze’s High-Rise Armory	Upstairs offices in Netshin Tech Complex, The Grid; read the named teal door prompt
Supreme Leader Access Card	Card lists B6, the Supreme Leader’s Bunker deep inside Chang-san Air Base; the full reader approach is unconfirmed
Mechanic’s Shack	F5, standalone shack south of Cheongun Village’s clinic, single white door
Militia Arms Depot	Card lists G7, lower-floor armory of Gangbyeon Apartment B at the Hajin River Heights compound

For Roze, do not substitute her DBN rooftop fight for the armory destination. For the Supreme Leader card, Iron Citadel’s upgraded mission card and six-digit keypad remain separate interactions.

Named locked rooms

These room names are visible on locks, but their exact inventory key names or acquisition routes remain incomplete. Search the Key Finder by room name rather than guessing a similarly named key.

Room	Entrance information
Police Station Armory	Pyeonghwa Village police station basement, beside holding cells and the caged armory window
Gas Station Electrical Room	Construction Zone gas station, grey door beside a noticeboard on a blue-striped brick wall
Old Barber Shop	Songdo Wharf shop, pale door beside a phone and noticeboard in a checkerboard corridor
Silo Control Room	Underground silo complex; the route passes a stairway near silo 42; surface entrance unconfirmed
Field Depot	Chang-san warehouse northeast of the clinic, light door with a red panel
Fire Station Storage	Cheongun Village fire station upstairs landing, reached by a yellow-and-red-striped stairwell

An office-desk key pickup is reported at police stations, but its exact equivalence to the level 19 Police Station Key is unconfirmed. Police Weapon Depository opens a different auxiliary armory.

Other ways keys and rooms can help

Counting Room Vault key: observed in an industrial locker on the Rice Mill catwalk route, in addition to the Silent Ledger reward. This is not a guaranteed spawn.
Militia Arms Depot key: observed in a duffel in The Citadel East Wing. Do not assume every duffel contains one.
Doctor’s Command Office: a Tempered Armor Vest recipe was observed in its Lieutenant crate. Extract with any recipe you find; the room does not guarantee that drop.

Keys with an unconfirmed door location

Key	What is established here
Police Station Key	Level 19 Recon Equipment Kit; exact matching station still unconfirmed
Underground Propaganda Store Room	Reported beneath the Re-Education Center; precise entrance unconfirmed

Use the recorded area and current key description where available. Where the exact entrance remains unknown, avoid treating an area marker as a confirmed door.

Story Mission key rewards

Mission	Reported key reward
Critical Extraction	Mirae Electrical Room, Rare
Silent Ledger	Counting Room Vault, Epic
Shopping Hacks	Coin Mining Den Key, Rare
Iron Citadel	Supreme Leader Access Card, Legendary
Grid Assault	Roze’s High-Rise Armory, Legendary
Fallen Ember	Reactor DRC Locker, Ultra

The keys are separate from each mission’s main objective. Check your reward screen after completion instead of assuming that opening a mission vault also opens its reward-key room.

Before opening a loot room

Bring only the keys relevant to your route. Stash the rest before deployment.
Check hazards and bring the required protection for the reactor.
Leave backpack space for loot and use eligible Secure Slots deliberately.
Recheck the full key name at the door before spending time on the wrong floor.
Plan extraction before making another locked-room detour, especially while carrying a Lieutenant Dog Tag Case.