Yes, all human occupied space stations to date have had a return vehicle for every crew member.

To my knowledge (and general consensus), that includes Skylab, Salyut, Almaz, Mir, Almaz and China's Tiangong.

For the ISS there was talk of a dedicated return vehicle (Crew Return Vehicle (or Assured Return Vehicle)) that would mean the Shuttle could drop off crew, who could rely on the ARV for emergency return if needed. But it was dropped and never happened. But even then, they would have a return seat, just not on the vehicle they launched on.

Otherwise, every occupant on any of the space stations had a seat to return in at all times.

Yes, all human occupied space stations to date have had a return vehicle for every crew member.

To my knowledge (and general consensus), that includes Skylab, Salyut, Mir, Almaz and China's Tiangong.

For the ISS there was talk of a dedicated return vehicle (Crew Return Vehicle (or Assured Return Vehicle)) that would mean the Shuttle could drop off crew, who could rely on the ARV for emergency return if needed. But it was dropped and never happened. But even then, they would have a return seat, just not on the vehicle they launched on.

Otherwise, every occupant on any of the space stations had a seat to return in at all times.

Yes, all human occupied space stations to date have had a return vehicle for every crew member.

That includes Skylab, Salyut, Almaz, Mir, Almaz, China's Tiangong.

For the ISS there was talk of a dedicated return vehicle (Crew Return Vehicle (or Assured Return Vehicle)) that would mean the Shuttle could drop off crew, who could rely on the ARV for emergency return if needed. But it was dropped and never happened. But even then, they would have a return seat, just not on the vehicle they launched on.

Otherwise, every occupant on any of the space stations had a seat to return in at all times.

Yes, all human occupied space stations to date have had a return vehicle for every crew member.

To my knowledge (and general consensus), that includes Skylab, Salyut, Almaz, Mir, Almaz and China's Tiangong.

For the ISS there was talk of a dedicated return vehicle (Crew Return Vehicle (or Assured Return Vehicle)) that would mean the Shuttle could drop off crew, who could rely on the ARV for emergency return if needed. But it was dropped and never happened. But even then, they would have a return seat, just not on the vehicle they launched on.

Otherwise, every occupant on any of the space stations had a seat to return in at all times.