Sector 530
Sector 530 was a spatial region that was located somewhere in the Alpha or Beta Quadrant.
In 2365, the Federation starship USS Hokule'a was assigned a deep space exploration mission of this sector. The sector was listed on the Starship Deploy Status chart that was on display in the courtroom of Starbase 173. (TNG: "The Measure Of A Man" okudagram)
This sector was only mentioned in writing.