I am new to growing geraniums -- are they any varieties that grow taller than others? I was hoping there were some that get about 2 feet tall.
If you mean half-hardy pelargoniums (geraniums), the answer is yes. The Antik series developed by PAC-Elsener in Germany will easily reach 24" in height. These plants should be available in the USA. You do not give any details about were you live but Z4 suggests hard, frosty winters. Pelargoniums require frost protection.
PS. I have grown the variegated Pelargonium "Frank Headly" in a large pot and this plant reached more than 24"