Tracks

Luigi Circuits (Including Figure-8 Circuit)
Mario Circuits
Donut Tracks (Including Donut Plains 1-3, Moo Moo Farm, Moo Moo Meadows)
Ghost Tracks (Including Ghost Valleys 1-3, Banshee Boardwalk, Boo Lake, Broken Pier, Luigi's Mansion, Twisted Mansion)
Bowser Castles
Choco Tracks (Including Choco Island 1-2, Choco Mountain)
Beach Tracks (Including Koopa Beach 1-2, Koopa Troopa Beach, Shy Guy Beach, Cheep-Cheep Island, Peach Beach, Cheep-Cheep Beach)
Frosty Tracks (Including Vanilla Lake 1-2, Frappe Snowland, Sherbert Land 64, Snow Land, Sherbert Land Double Dash)
Desert Tracks (Including Kalimari Desert, Sunset Wilds, Yoshi Desert, Dry Dry Desert, Desert Hills, Dry Dry Ruins, Bone-Dry Dunes)
Highway Tracks (Including Toad's Turnpike, Mushroom Bridge, Mushroom City, Shroom Ridge, Moonview Highway)
Stadium Tracks (Including Wario Stadium 64, Waluigi Stadium, Wario Stadium DS)
Royal Tracks (Including Royal Raceway, Peach Circuit, Peach Gardens, Daisy Circuit)
DK Tracks (Including D.K.'s Jungle Parkway, DK Mountain, DK Pass, DK Summit)
Yoshi Valley
Jungle Tracks (Including Riverside Park, Lakeside Park, Dino Dino Jungle, Yoshi Falls)
Cheese Land
Cloud Tracks (Including Sky Garden, Cloudtop Cruise)
Ribbon Road
Baby Park
Daisy Cruiser
Yoshi Circuit
Wario Colosseum
Delfino Square
Waluigi Pinball
Tick Tock Clock
Airship Fortress
Mountain Tracks (Including Mushroom Gorge, Daisy Hills, Rock Rock Mountain, Shy Guy Falls)
Toad's Factory
Coconut Mall
Wario's Gold Mine
Pipe Tracks (Including Koopa Cape, Piranha Plant Slide)
Maple Treeway
Grumble Volcano
Toad Circuit 
Shy Guy Bazaar 
Wuhu Tracks (Including Wuhu Loop, Maka Wuhu)
Music Park
Wario's Shipyard
Neo Bowser City
Mario Kart Stadium
Water Park
Sweet Sweet Canyon
Thwomp Ruins
Toad Harbor
Sunshine Airport
Dolphin Shoals
Electrodome
Mount Wario
Rainbow Roads