List of Rares by Zone

Eastern Kingdoms
(25-30) Arathi Highlands
(44-48) Badlands
(50-60) Blackrock Mountain
(55-60) Blasted Lands
(49-52) Burning Steppes
(30-35) Cape of Stranglethorn
(1-10)   Dun Morogh
(20-25) Duskwood
(40-45) Eastern Plaguelands
(1-10)   Elwynn Forest
(1-10)   Eversong Woods
(20-25) Hillsbrad Foothills
(30-35) Hinterlands
(10-20) Loch Modan
(25-30) Northern Stranglethorn Vale
(47-51) Searing Gorge
(10-20) Silverpine Forest
(1-90)   Stormwind City
(51-55) Swamp of Sorrows
(1-10)   Tirisfal Glades
(35-40) Western Plaguelands
(10-15) Westfall
(20-25) Wetlands

Kalimdor
(20-25) Ashenvale
(10-20) Azshara
(1-10)   Azuremyst Isle
(10-20) Darkshore
(30-40) Desolace
(1-10)   Durotar
(35-40) Dustwallow Marsh
(45-50) Felwood
(35-40) Feralas
(1-10)   Mulgore
(10-20) Northern Barrens
(55-60) Silithus
(30-35) Southern Barrens
(25-30) Stonetalon Mountains
(45-50) Tanaris
(1-10)   Teldrassil
(40-45) Thousand Needles
(50-55) Un'Goro Crater
(50-55) Winterspring

Outland
(65-70) Blade's Edge Mountains
(58-70) Hellfire Peninsula
(64-70) Nagrand
(66-70) Netherstorm
(67-70) Shadowmoon Valley
(62-70) Terokkar Forest
(60-63) Zangarmarsh 

Northrend
(70-72) Borean Tundra
(71-80) Dragonblight
(73-75) Grizzly Hills
(68-72) Howling Fjord
(77-80) Icecrown
(75-80) Sholazar Basin
(77-80) Storm Peaks
(73-77) Zul'Drak

Cataclysm Zones
(82-83) Deepholm
(85)      Molten Front
(80-82) Mount Hyjal
(84-85) Twilight Highlands
(83-84) Uldum
(80-82) Vashj'ir

Pandaria
(89-90) Dread Wastes
(85-87) Jade Forest
(86-90) Krasarang Wilds
(87-89) Kun-Lai Summit
(88-89) Townlong Steppes
(90)      Vale of Eternal Blossoms
(86-88) Valley of the Four Winds

Full Continent of Pandaria Map: Rare Pandarian Champions by Type

Isle of Thunder (New in 5.2)
(90) Isle of Thunder (Champions of Lei Shen)

Isle of Giants (New in 5.2)
(90) Isle of Giants

Darkmoon Island
(1-90) Darkmoon Rabbit