According to the Goodyear website, the three active GZ-20 blimps are 192 feet (58 meters) long, 59.5 feet (18 meters) tall, and 50 feet (15 meters) wide. For comparison, the largest airships ever built, the Zeppelin company's Hindenburg, LZ-129, and the Graf Zeppelin II, LZ-130, were 804 feet (245 meters) long and 135 feet (41 meters) in diameter. That is, over four times as long and over twice as wide as the current Goodyear blimps. The largest blimp ever made by Goodyear was the U.S. Navy's ZPG-3, at 403 feet (121 meters) in length.

In May 2011 Goodyear announced it will be replacing its fleet of blimps with three semi-rigid airships built by Zeppelin NT.

Source: Wikipedia