With the syrup. I’m 27.
Interestingly enough, I went to buy corn syrup the other day, and I looked in the baking goods aisle first. I guess my reasoning was that corn syrup would only be used in baking, while molasses could reasonably be used like maple syrup, as a topping.
Without looking at other answers:
30, male if that matters.
I would look in the baking goods aisle. If not there, I would shrug, scratch my head, and keep an eye out while doing the rest of my shopping.
In the syrup area.
I’m 65, love the dark molasses on my pancakes, and will practically drink the stuff.
Posted without looking further than the third posting.
I’d expect to find it in the baking area. I’ve found this thread surprising, because I have never (and I mean never) heard of anyone using molasses as a syrup before.
Interestingly enough, I just checked at my local grocery, and it’s next to the maple and pancake syrups, along with the Karo. Baking happens to be in the same aisle, but the opposite side, all the way down.
Galettes de sarrazin (buckwheat pancakes) however are just not right without molasses. 
I consider it a syrup and find it next to maple syrup and jams at the store. I do use it for baking, occasionally, but have fond memories of our 4-o’clock snack in boarding school (a slice of white bread and molasses, a glass of milk- reconstituted powdered milk). You can probably guess that the boarding school didn’t cater to children of the affluent classes.
The last time I bought it I looked in the baked goods isle first. It wasn’t there. It was next to the pancake syrups and pancake mixes, which for some reason are in the cereal aisle instead of the baked goods aisle. I think that’s weird. The cereal aisle is right next to the baked goods aisle, though.
I’m 22.
Oh, and I do mostly use it on pancakes. I can’t stand maple syrup, real or fake.
By the pancake syrup. I’m 38. Damn kids (get off my lawn!) don’t realize it’s for baking rather than eating.
An old guy I knew (single) used to swear a tablespoon a day was good for your stomach. If you opened his fridge you would find a 6 pack, a bottle of rum and a can of molasses.
Near the sugar and corn syrup.
I’m 22 and I don’t think I’ve ever actually bought molasses but I have baked with it.
I guessed that older people would be more inclined to think of it more as a pancake/biscuit topping and younger people would be more inclined to think of it as only an ingredient for baked goods and the like.
I’m 37 and I look for molasses in my pantry because it’s a really tasty addition to homemade barbecue sauces.
When I get more I’ll start by looking in the bakery aisle (which is the same aisle as the maple syrup).
Assuming I was out, I’d look in the honey, syrup, sweet thick stuff section usually near the baking supplies. I’m 32.
With the syrup. I’m 51.
My general plan is to check by the sugar in the baking aisle, and if it’s not there for some reason, check the pancake syrup area.
I’m 20 and really annoyed because I ran out of molasses while making schadenfreude pie on New Year’s Eve and still haven’t gotten a replacement. I go through a bottle of molasses every year or two from gingerbread, BBQ sauce, and ham; the New Year’s Eve ham this year had no molasses because the schadenfreude pie used it all up. Brown sugar and mustard isn’t the same as molasses and mustard as the glaze.
Fresh homemade biscuits, with butter and molasses… I get weird looks from many people when I tell them that’s what I like. Mmm.
I think I’m making biscuits tomorrow.
Oh, and I’m pretty sure the molasses is with the syrups, which is near the pancake mixes and iirc the coffees and teas. The baking goods are (iirc) on the other side of the aisle… not far apart at all.
Top shelf in the syrup section. Every grocery store I’ve ever been to, above pancakes. ( Worked in a grocery store, so one notices these things as well.)
Female.
42
Finally bought some molasses today: it was on the bottom shelf near the end of an aisle, below (working up) the corn syrup, not-real pancake syrup, maple syrup, weird jams that don’t go in the jam section at that store, and the fruit syrups. To the right were pancake mixes. To the left was an endcap, but I don’t remember what it was.
I don’t think I’ve ever seen molasses for sale in a supermarket. 
You can get it in 100L barrels at the stockfeed stores though. 
Baking isle, 40.
Strangley enough I was in the baking isle last week and that is were I saw it but I was not looking it for it. I was looking for honey which after asking was by the peanut butter and jelly.
This in reverse. I expect it to be with the syrups (I’m 40), and it is in “my” grocery store. If they decided to move it to where the sugar and other “baking needs” are it would only be a move 15 feet to the left.
I don’t expect i t to be with the syrups because I use it in any syrup capacity, but because when I first looked for it and didn’t find it in “baking” I learned to look for it with syrups.