These are the leveling zone ranges in Classic World of Warcraft. Enjoy your leveling.
1-10 Durotar
1-10 Elwynn Forest
1-10 Mulgore
1-10 Teldrassil
1-10 Tirisfal Glades
10-20 Darkshore
10-20 Loch Modan
10-20 Silverpine Forest
10-20 Westfall
10-25 Barrens
15-25 Redridge Mountains
15-27 Stonetalon Mountains
18-30 Ashenvale
18-30 Duskwood
20-30 Hillsbrad Foothills
20-30 Wetlands
25-35 Thousand Needles
30-40 Alterac Mountains
30-40 Arathi Highlands
30-40 Desolace
30-45 Stranglethorn Vale
35-45 Dustwallow Marsh
35-45 Badlands
35-45 Swamp of Sorrows
40-50 Feralas
40-50 Hinterlands
40-50 Tanaris
45-50 Searing Gorge
45-55 Azshara
45-55 Blasted Lands
48-55 Un’goro Crater
48-55 Felwood
50-58 Burning Steppes
51-58 Western Plaguelands
53-60 Eastern Plaguelands
53-60 Winterspring
55-60 Deadwind Pass
55-60 Moonglade
55-60 Silithus