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MIT blogger CJ Q. '23

How to find your way around MIT by CJ Q. '23

mit building numbers are logical, but weirdly

I’m surprised that no one’s written a blog post about this before; the closest thing is this paragraph on Wikipedia. This was originally going to go out just before CPW, but that got canceled, so… Anyway, here’s your orientation, in the literal sense. This is what the campus looks like. It’s mostly a long strip:

mit’s campus, divided into labeled parts

There’s west campus on the west, which has the dorms, the student center, and most of the athletics buildings. There’s main campus, which is the pentagon in the center; most activities will take place on main campus. There’s east campus on the east, which has some administrative buildings, MIT medical, and Sloan. (Here, east campus is a group of buildings, not to be confused with the building that has the name East Campus.) Then there’s north campus and northwest campus.

These parts are defined by roads. Everything to the west of Massachusetts Avenue is on west campus, everything to the east of Ames Street is on east campus, and everything ot the north of the railroad tracks near Vassar Street is north campus.

We’ll be focusing on building numbers. Buildings in west campus all have numbers that begin with W, like W20, the Student Center, or W16 Kresge Auditorium. Buildings in east campus have numbers that begin with E, like E23 Health Services or E62 MIT Sloan. Similarly, N for buildings in north campus and NW for buildings in northwest campus. Buildings in main campus do not have a letter in front and just have numbers, like Building 7 or Building 26.

Rooms within buildings are written like 2–190. The number before the dash tells you the building, which is Building 2. The leading digits after the dash are the floor number, which is 1, the first floor. A floor number of 0 is the basement. The remaining digits indicate the specific room. Since most hallways within a building don’t branch off, room numbers typically increase in one direction.

some building numbers in building 2

Because of that, once you know where the building is, it’s usually easy to locate where a specific room is. So once you know where the building numbers are, you can navigate your way around MIT! We’ll start with Building 10, which you’re probably familiar with from all of these MIT pictures:

building 10 and the great dome

by john phelan, cc-by 3.0

That’s Building 10. Building numbers generally go higher the further they are from Building 10. In front of Building 10 is Killian Court. Imagine a line stretching from the back of Building 10 to the Charles River, cutting the dome in half. This line points from what we call MIT north, which is a little off from actual north, to MIT south. Most buildings are aligned along MIT north–south and west–east. Many maps of MIT are pointed with MIT north up, unlike whereis.mit.edu.

the “compass” through building 10

The west–east line we just drew is the Infinite Corridor, or just the Infinite. It starts from Building 7, which is an important MIT landmark, and branches off in the end at Building 8. It’s a pretty important hallway for navigation. Most of the rooms along the hallway are administrative rooms and labs, so you likely won’t have any classes along the Infinite, but it’s a good idea to get familiar with it. It is in fact not that long, so it makes no sense to me why it’s called the Infinite.

Again, look at that north–south line through Building 10. On main campus, the buildings numbers to the west of that line are odd, and the building numbers to the right of that line are even. There are only three exceptions, which are 42, 51, and 57, and in practice you can ignore 51 and 57 because no one refers to those buildings by number.

main campus, divided into odd and even

If you focus on the Buildings 1 through 8, you’ll see that they’re also mirrored about that line. 1 is the mirror of 2, 3 is the mirror of 4, 5 is the mirror of 6, and 7 is the mirror of 8.  These numbers make sense because these buildings, along with Building 10, were the first ones constructed on main campus. Note that although they’re symmetric about that line, the buildings don’t have exactly the same layout indoors.

the mirror layout of buildings 1 through 8

The most important thing to note about the building numbers are the buildings that end with 6. Buildings 6, 16, 26 and 36 all lie on one straight north–south line, in that order, and if you continue that line across the street, you get to Building 46. Branching off from Building 16, you get Buildings 56 and 66 in a single west–east line as well, which acts like an “extension” of the Infinite. These are pretty important buildings to remember because they can help you figure out where the rest of the buildings are.

buildings 6, 16, 26, 36, 46, 56, 66

Buildings that have the same tens digit are roughly located in lines, except for the tens. There are only two buildings in the twenties, Building 24 and 26. The Building 30s are all in a straight west–east line, passing through Building 36. Again, remember that odd numbers are west of Building 10 and even numbers are east. Building 32, in particular, is more often called Stata; it’s one of MIT’s landmarks because it’s huge and weird-looking. If you cross the street, the Building 40s are also in a straight line, and in fact going in increasing order from west to east.

the 30s and the 40s

Finally, the Building 50s and Building 60s are aligned in roughly north–south lines. It’s important to note that many of these buildings often don’t get called by their building number. Building 50 is Walker, where you will probably take some exams, and Building 54 is the Green Building. It’s the tallest building in Cambridge, so it’s also an MIT landmark. Buildings 62 and 64 are called East Campus, despite being located in main campus. (Again, East Campus the building is different than east campus the group of buildings.)

building 50s and 60s and the lines

Alright, that’s it. I wrote a Sporcle quiz so you can test yourself on the building numbers on MIT’s main campus. Have fun.