Couldn't find this information here so I'm just re-posting information compiled by Godzilladude on the old conan.com forum.
Word Count for the Conan Tales The Hour of the Dragon, 72,800
Red Nails, 31,200
The People of the Black Circle, 31,100
The Black Stranger, 30,500
Beyond the Black River, 22,000
The Jewels of Gwahlur, 17,200
A Witch Shall Be Born, 16,500
The Scarlet Citadel, 15,700
Black Colossus, 14, 400
Xuthal of the Dusk, 12,900
The Devil in Iron, 12,400
Iron Shadows in the Moon, 12,200
Man-Eaters of Zamboula, 12,100
The Pool of the Black One, 11,500
The Tower of the Elephant, 9800
Queen of the Black Coast, 9800
The Tombulku fragment, 9800
Rogues in the House, 9700
The Hyborian Age, 9400
The Phoenix on the Sword, 9100
The God in the Bowl, 7900
Wolves Beyond the Border, 8500
The Vale of Lost Women, 6600
The Shumballa fragment, 3500
The Frost-Giant's Daughter, 3200
The Tombulku synopsis, 2000
The Yaralet fragment, 900
The Shumballa synopsis, 700
The Nestor synopsis, 600
Notes on Various Peoples of the Hyborian Age, 600