My graduating class in rural Louisiana public school was 39. We were one of the smaller classes by a handful of people and the school itself was grades 7 - 12 so total enrollment was about 300 and something. My high school burned down my senior year which I guess was everyone’s dream but it was a bit of a hassle. There were some much smaller public schools around though. I am surprised that the smallest in the country is supposedly 47 students. I knew of a few public schools that were barely bigger than that and a private one that was smaller.
'Bout 400, maybe 425.
1972, the year I graduated, there were over 2500 students in my high school - grades 10-12. The next year, a new high school opened, so the incoming class was considerably smaller. Had the new school opened sooner, I’d have attended there - it was within a mile of home.
My graduating class had 600+ in it. Very big high school.
I can’t remember exactly, but there were something like 700 in my senior class, so that would be about 2,400 in the whole school. This was in Houston.
My graduating class was about 210 people, with a bit more in earlier years. So I would guess a total of about 875.
Same enrollment as my high school, but we only had grades 8-12. My class graduated 114.
My high school is not in Wiki, but it had between 300 and 350. The thing is, though, that three towns went to my high school, so that seems pretty unique in this thread.
About 1100-1200 when I went there in the early 1990s. The enrollment declined slightly after that, but the district recently closed another high school so I imagine enrollment is back up again.
I started out at a high school of around 250 and if I had stayed, my graduating class would have been ~15-20 people. I transferred to one with about 700 students and my graduating class was about 150 people.
I put 2500-3000 which was true when I went there but I did some research and it looks like they redrew the lines and moved some kids over to one of the other high schools in the district because mine was getting too crowded. We had a lot of new subdivisions pop up in my area over the last 10 years on what used to be nice, open land 
But that’s another story…
Even though we cobbled together a graduating class of 39, it was composed of at least 5 towns spread out over two states (Louisiana and Texas). I have never heard of of another public high school that had students from two states but it was a border area and some students didn’t have a school close enough on their side of the border.
Then again, we had a number of strange things going on. Even though we were so small, we were fully segregated into two schools until 1980 when I was in 1st grade. My parents taught at the black school. Most people think that stuff was over by the early 1960’s but nope. My grandfather had to oversee a full-blown integration effort 20 years after most of the country as president of the school board and there was plenty of opposition from both sides and not just for the simplistic reasons you might think. We had one K-12 each for blacks and whites before that. After integration, we had mixed K-6 and 7-12 with the black school becoming the elementary school.
I am still finding it hard to believe that the smallest high school in the U.S. is 47. That seems way large for some of the truly remote areas out there. My cousins grew up deep in the Rocky Mountains and had to go to school by radio during the winter because there was no way to get them to school safely and cost effectively every day and that wasn’t even that long ago. There are some places out there that love to have a thriving population with 47 people in that age range and won’t ever get it without a population boom.
Yes, the question of how many grades in high school should also be considered. My high school had five grades in it, for example.
At any rate, my high school in Toronto had about 1200 students spread among five grades when I attended in the 1970s. The school has fewer students nowadays, as it “shed” a grade some years back, and now only has four grades.
My high school was about 4000 enrollment. It now has about half that.
There were a lot of kids you did not know. There were lots of sects with people often keeping with their grade school friends and then slowly expanding out.
Around 800. Four grades of around 200 students each.
Funny thing, when I tell my (Norwegian) high school students that now, they think I went to a huge school. But it was one of the smallest high schools in the area.
Freshman and sophomore years, I went to Carmel High School with 4000 students.
Junior and senior years, I went to The Indiana Academy with 300 students.
Just came in to say that my mother was the President of her class at Bridgewater, SD high school, and I took her to her 50th Reunion wherein I learned the story of the night her mom was out of town, the weather was bad, her friends stayed over at her house, and exactly how much beer could be fit into the back of a pickup truck.
I’m just sayin’.
Spent many a summer walkin’ the streets of tiny Bridgewater, drinking Mello Yello out of a glass bottle.
About 2000 students. 500 seniors. My GPA ranking? #250. Mr. Average.
My school ran from 7th to 12th grade, and was comprised of a Middle Division (7-9) and an Upper Division (10-12). The Middle Division had 12 homeroom classes per year of 35-40 kids each; the Upper Division had 8 homeroom classes of 35-40 kids each. That means that there were some 2250 students in the building, with some 300 in my graduating class.
Awesome. It’s not often I find someone who went to a smaller school than I did.
Shattuck, OK. My graduating class had 30 people. The neighboring town of Gage usually averaged around 4-10.