[Robert DeLong]

FWIW, the consensus seems to indicate there were 156 episodes Duration October 2, 1959 – June 19, 1964:

The episode highlighted in this article is episode 156.

Season 1: 36 episodes
Season 2: 29 episodes
Season 3: 37 episodes
Season 4: 18 episodes
Season 5: 36 episodes

IMDB: Twilight Zones episodes list

Wikipedia; Twilight Zone

Also there were three iterations of Twilight Zones after the original:

The Twilight Zone (1985–89)
The Twilight Zone (2002–03)
The Twilight Zone (2019–20)

[CatOwner]

The CBS Blu-Ray set for The Twilight Zone also indicates 156 total episodes. I found the box set some time ago for a great deal. I need to start watching it.

[fwdude]

I actually liked Rod Serling’s 70’s endeavor “Night Gallery.” Similar format to TZ with unrelated vignettes exploring a horror/supernatural suggestion. Some of them were terrifying to me as a kid.