Only in the novel.
Searching subtitles from different versions of the released movie (from DVDRip, to BRRip, to Collector's Edition, to those old XViD RIPs that came in 2 CDs), I cannot find any reference to the counter.
However, in the novel, it’s a major plot point
[Total animals: 238]
“Everything accounted for, as always.” He couldn’t keep the satisfaction out of his voice.
“Now then,” Malcolm said. “Can you have the computer search for a different number of animals?”
“Like what?” Arnold said.
“Try two hundred thirty-nine.”
“Just a minute,” Arnold said, frowning. A moment later the screen printed:
[Total animals: 239]
And eventually, they reach the actual total
This part of the novel has not made it into movies, as far as I can tell. It appeared in the early script drafts, as you can see here:
MALCOLM: Of course I'm right, I'm always right. And while you're at it, search for 300 animals.
WU: Three hundred?
ARNOLD: (shakes head, hits keys) Searching for... three hundred.
The screen prints: Total Animals: 241. Talk is fast:
HAMMOND So! My kids are out there!
ARNOLD (relieved) Yeah. Looks like it, sir.
The screen suddenly prints: Total Animals: 258.
But it doesn't show in the first draft (also here), or in the final script (also here). It is also not listed as a deleted scene (also here). As far as I can tell, you remembering it is just a trick of the mind.