Quests starting in Isengard

Name	Level	Zone	Area
Book 4, Chapter 21: Servants of Saruman	72	Isengard	Isengard
Book 4, Chapter 22: Feed the Prisoners	72	Isengard	Isengard
Instance: The Wizard's Vale	72	Isengard	Isengard
Raiding the Larder	72	Isengard	Isengard
Their Best Interests	72	Isengard	Isengard
Trival Business	72	Isengard	Isengard

Quests involving Isengard

Name	Level	Zone	Area
Book 4, Chapter 25: Final Preparations	72	Isengard Depths	Isengard Depths
Instance: Escape from Isengard	72	Isengard Depths	Isengard Depths
Instance: The Captive	72	Dunland	Tal Methedras
Isengard: Dargnakh Unleashed	75	Middle-earth	Global
Isengard: The Foundry	75	Middle-earth	Global