Starbase 73

From Memory Alpha, the free Star Trek reference.

Starbase 73 is a Federation starbase.

In 2365, the USS Enterprise-D stopped at the starbase prior to its visit to the Endicor system. William Riker bought some 'Owon eggs here. (TNG: "Time Squared")

Later that year, the Enterprise-D returned to this starbase where it was assigned to investigate a distress signal emanating from the Ficus sector. At the time, the facility was commanded by Admiral Moore. (TNG: "Up The Long Ladder")

In 2367, the Enterprise was once again docked at the starbase, following the deaths of K'mpec and K'Ehleyr. While there, Sergey and Helena Rozhenko met the starship and took Alexander back to Earth, where he could be cared for. (TNG: "Reunion")