Command Offered to Commander Riker

• "The Arsenal of Freedom" - USS Drake (mentioned--offered before Enterprise)
• "The Icarus Factor" - USS Aries
• "Best of Both Worlds" - USS Melbourne

Riker actually commands a ship, albeit temporarily, in the following episodes:

• "A Matter Of Honor" - Klingon Ship Pagh
• "Peak Performance" - USS Hathaway
• "The Best Of Both Worlds-Part II" - USS Enterprise NCC-1701D
• "Redemption II" - USS Excalibur during a blockade