ARIA  
Bar Masa
Skybox
Haze Nightclub
Gold Lounge
Deuce Lounge
View Bar
Moderno
City Bar
Pool Bar
Baccarat Lounge
 
Bally's
SULLEY'S,
INDIGO LOUNGE
TEQUILA BAR
Evening Call is a frozen drink style bar at three locals around Vegas

Bellagio: 
Petrossian Bar named America's best hotel bars by Sante Magazine.
Hyde
Lilly bar and Lounge
The Bank 
STARTING GATE is a small bar by the sportsbook(one of my favorites)
Pool Bar
Baccarat Bar
Mixology

Bill's(CHANGING)
Bills Lounge
Slush Bar

Circus Circus
Rock & Rita's 
West Bar
Slots a Fun Bar
Big Chill
Lobby Bar
Cactus Bar

Caesars
Pure Nightclub
Shadow Bar
Cleopatra barge
Galleria Bar Sit back and enjoy a drink .
PJ Clarke's (forum shopps)
Spanish Steps an outdoor meeting spot.
SEAHORSE Lounge  I have to check it out next trip.
Numb Bar & Frozen Cocktails

City Center
@Aria (above) or check out there website
@Crystals  Todd English P.U.B.
@Mandarin Oriental  Mandarin bar great views and atmosphere
@Vadra has Vdara Bar

Cosmo
Chandelier (WOW, this lounge is amazing)
Vesper
Book and Stage from sports book by day to a stage at night.
Bond
The Queue

Encore: 
EASTSIDE
ENCORE LOBBY
PARASOL UP
PARASOL DOWN
TOWER SUITE BAR
XS
SURRENDER
TRYST

Excalibur: 
The Lounge Enjoy sultry, smooth sounds.
OCTANE Lounge hard rockin' fun,
Dicks Last Resort

Flamingo: 
Carlo's and Charlie's
Bugsy's Bar, open 24 hours.
Garden Bar
MARGARITAVILLE
Sin City Brew Co.

Harrah's
The "Sports PIT" bar is located by the Sports book. 
Carnival court is always happening,
TOBIE KEITH'S(country stuff),
OYSTER BAR its actually an oyster bar
Numb Bar
Piano Bar (Home of Big Elvis)

Hooters:
Porch Dogs, 
Pete and Shorty's
Pool Bar
and there is a HOOTERS too.

Imperial Palace:
(GONE)

LVH:
Tatuado (Vince Neils Cantina)
Tempo 
Eighth Pole Bar   A sports lover's paradise, 
Plaza Bar 
Zen Lounge Located at Benihana
Cabana Bar  
Space Quest lounge

Luxor: 
LAX 
Aurora 
Flight 
Savile Row 
Centra 
High Bar 
Playbar

Mandalay Bay
Mix Lounge (in THEhotel)
Evening Call is an exotic frozen beverage bar.
Red Square Bar
Fat Tuesdays
Orchid Lounge
The Lounge (in THEhotel) is a swank, contemporary hangout. 
House of Blues (very cool)
RI' RA Irish Pub. (newest pub in town)
Eye Candy
Foundation Room
Minus 5 Ice Lounge

MGM: 
Vida
Zuri,
Centrifuge,
NobHill 
Rouge
West Wing
Tabu 
Hakkasan

Mirage
Dolphin Bar Poolside 
Sports Bar
Onda Lounge
Bare  adult pool bar.
Japonais Lounge
Rhumbar A NeonVacation Favorite! Very relaxing patio with great views. 
Right off the corner of the strip so not to loud with traffic. Back ground noise is all around so you wont be in a whispering kind of setting.
King Ink
Revolution 
1OAK
High Limit Lounge
True Pour

Monte Carlo: 
Ignite Lounge 24hrs. Great to catch a game or just relax.
Minus 5 Ice Bar 
Sportsbook bar
Andres Lounge
Brand Lounge
Diablos
Dragon Noodle
Wine Bar at D.Vino
The Pub
Hit Bar and Lounge
Big Chill

New York New York
Nine Fine Irishmen
Pour 24
Coyote Ugly
Center Bar
Bar at Times Square
Lobby bar
Big Chill
High Limit Bar

Palazzo: 
Act Nightclub
Lounge at Sushisamba
Double Helix Wine and Whiskey Bar
Lavo Night club
Fusion
Lagasse's Stadium A NeonVacation Favorite! 
Great for watching games or catching up on the day. Cross between a Sports Book and a casual restaurant. 2 floors of comfy seating and great views of televisions.
Zebra Lounge
Laguna Champagne Bar

Paris

Napoleon's Dueling Piano Bar,
Chateau Nightclub
Le Cabaret
Le Central Lobby Bar,
Le Rendezvous Lounge
There is a bar in SUGAR FACTORY as well.

Planet Hollywood:
Gallery Nightclub 
Koi lounge
Heart Bar
Cabo Wabo mas tequila?
Blondies @ the Miracle Mile Shops. Awesome Happy Hour.
Sin City Brewing Co.
Stripper Bar
Playing Field
Extra Lounge
PBR Rock Bar

Riviera: 
Le Bistro Lounge
The Queen Victoria British Pub Open 24 hours and hosts live bands

Rio: 
Masquerade Bar
iBar
Voodoo Rooftop Nightclub
Flirt Lounge
Irish Pub (formerly McFadden's) 

Stratosphere:
Air bar, 
Images
Level 8 Pool bar,
Race/Sports bar.
Level 107 lounge high above the strip,
C-Bar

Treasure Island: 
Senior Frogs
Kahunaville
Isla Tequila bar
Gilley's
Margarita Bar Next to Gilleys (Outdoors)
Breeze


Tropicana:
Lucky's Sports Bar
Tropicana Lounge
Chill'M
                                              
Venetian:
Bellini Bar
Bourbon Room
Tao 
V Bar  Voted “Best Hotel Bar” twice. 
Rock House

Wynn: 
EASTSIDE
PARASOL UP
PARASOL DOWN
TOWER SUITE BARXS
SURRENDER
TRYST
WYNN SOCIAL

Click Here for complete list.

Inside the Flamingo, this is a constantly busy, centrally located bar. 
We had a great time and our bartender (name was Song) was a super fun guy and provided great service. Generally bars in the middle of the casinos are slow served, especially with only one bartender, but this guy was awesome and fast and had time to joke and discuss events around the casino etc. We were very impressed with the crowd too, for a Thursday it was very busy almost fully seated. T.V's were not all on one thing but plenty of different programming from news to sports to Housewives of New York (I'm told). Prices were low but we played and drank anyway so we didn't pay for our cocktails or beers. Won a little lost a little, but had so much fun we will return.

This is a great lounge in The Mirage. Its located in the middle of the casino. Meet up with friends before you head out or come in after the Beatles Cirque show "LOVE". 
We had a couple drinks each at about $7-$9 ea.
The music isn't Beatles music as one would expect but a nice mixture of R&B and remixed top 40 stuff. Some music seemed louder at times then others but there wasn't a huge crowd in there at  that time.. Wait staff was very friendly and suggested other spots to continue our journey. On Tuesday the bar opens at 6pm, but the other days of the week it is open from 10pm until 4am.