Total enrollment was about 250 - that was 7th-12th. My graduating class was one of the biggest in the history of the town. We had 32!
Cub Mistress - you’re saying that the salutatorian was the dumbest guy in the class?
I went to the largest HS in the state at the time. School enrollment was around 2,600, my senior class was almost 900.
250 students, grades 9 - 12.
I started in one where the total was about 46 with just 10 in my class and graduated from one with just under 2000.
Never did adjust well to the change.
In Junior High, there were 666 people. By the time I graduated, there were 668.
At the time, consistently just shy of 1000 students (I seem to remember a running joke at the first assembly of the year about how many students we needed to hit that number…I think we were just short by 4 or 5 one year!). Wiki currently lists it at 1150, but I know that a technical institute (vocational training) has been added to the campus. The building capacity is much larger though; something in the 3000 student range, on a 45 acre piece of land. It’s never come close to that.
Skyline is currently 4,587 according to its website.
My graduating class was about 1500, there were 1100 in the class before me. (I worked in the College Office, so I saw these statistics.) Not sure about the class after that, but they opened a new high school near us which cut down attendance. I couldn’t find the enrollment on their website, since it was combined with other NY schools, but the Times had an article on it not long ago, which said they were still very crowded because lots of people from outside the immediate are wanted to attend.
When I went we were in split sessions, with students in the school from 9 am to after 5. But even with that it was a great high school.
About 1200 in four grades 9-12.
Small K-12 private school; I dropped out after 8th grade (and voted accordingly), but when I left the entire school’s enrollment was around 300, high school age kids around 80. Friends who stayed and finished high school reported that the class of 1992 consisted of 10 or so seniors, and total school enrollment had dropped below 150.
According to Wikipedia, around 1370.
I was both Salutatorian AND the bottom 50% of my graduating class;
2 of us graduated mid-year from a Department of Defense High School on an overseas Marine base.
The Senior class was 14 students with a total of 75 kids in grades 9-12.
About 2,000 over three grades. My graduating class was about 550. This was when the first waves of baby boomer kids were starting to graduate, and high schools were bursting at the seams.
Did you guys with a thousand people in your class do the whole walk across the stage, take your diploma, shake hands, smile at the camera routine at your graduation ceremony?
I had 36 people in my class, and I’ve often thought graduations at larger schools must be excruciating. I was bored enough with 36.
My high school had around 1200 kids when I was there. I see now that it has less than a thousand; I suspect that this is because it’s only grades 9 - 12 now. When I was there, it has the optional pre-university grade 13.
Yes. It took several hours, like from 10 in the morning to 1-2 in the afternoon and you weren’t allowed to leave early or get up at all except to get your diploma, although I suppose we could have anyway; I mean what were they going to do, expel us? 
Ugh! I think mine was maybe 90 minutes, including various speeches, two songs by the choir, and a video retrospective going all the way back to kindergarten.
Though the larger pool of classmates to choose friends from might have made the long graduation ceremony worth it. The same 36 people, all day every day, kindergarten through 12th grade.
I answered this poll a while ago, but didn’t comment. I went to a high school (one of those highlighted in a previous link) that had 5,000+ students (grades 9 - 12). The graduating class was about 850, so you can see the very high dropout rate. But my graduating at #40 was still top 5%. 
~300 when I started, ~500 when I left.
This was in largish Ontario city when OAC was still around, so that’s 5 grade levels - it was the newest school in the area, and thus the smallest when I started (I think my grade 9 year was the first we actually had an OAC class).
My graduating class had about 100 students. I’m not sure how many students the school had.