Note: X and Y are coordinates (light years on XY plane) relative to Terra at (0, 0)
The Zefri system was either colonised during the Star League era or became significant enough for Inner Sphere nations to begin noting the system on maps. The system was removed from later maps suggesting that it had either been abandoned, depopulated, or rendered too insignificant to continue to be noted on maps.
- 2571 - No record 
- 2596 - No record 
- 2750 - Rim Worlds Republic 
- 2764 - Rim Worlds Republic 
- 2765 - Rim Worlds Republic 
- 3145 - No record
| Systems within 60 light-years (distance in light years)|
Closest systems first:
- Handbook: Major Periphery States, p. 25, "Rim Worlds Republic At the Fall of the Star League "
- Historical: Reunification War, p. 159, "Inner Sphere - 2596"
- Era Report: 3145, p. 39, "Inner Sphere Map - "
- Field Manual: 3145, p. VI, "Inner Sphere - 3145"
- Handbook: Major Periphery States, p. 18, "Rim Worlds Republic after Age of War "
- Field Manual: SLDF,Map: Inner Sphere 2764
- Historical: Liberation of Terra Volume 1, Map: Inner Sphere 2765