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
(10-20) Ghostlands
(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
(90)      Isle of Giants
(90)      Isle of Thunder
(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

Timeless Isle (New in Patch 5.4)
(90)      Timeless Isle

Darkmoon Island
(1-90) Darkmoon Faire