Not to talk down to you (I don't know how much you know), but most of the pictures you see featuring "blimps" are probably just barrage balloons. These were large unmanned balloons, tethered to the ground with large steel cables, such as in this picture of the normandy beaches. Militaries put these up as air defenses, to make it risky for aircraft to fly low around them (large cables and fast aircraft don't play nice together).

Now, if you already knew all that, and were taking about real blimps with people inside, then the answer is yes, they were used. The American navy was the largest user of blimps during the war. I answered a different question about them here.