2 - 32 x 52 old cardboard ones
2 - 18 x 24 self-healing
1 - 12 x 18 self-healing
1 - 12 x 12 ironing/pressing
1 - 17 x 17 rotating self-healing
1 - 6 x 8 self-healing
1 - 6 x 8 white plastic

I use them all depending on what I am doing and where I am doing it.

I would like a larger self-healing but I don't have a table that I can keep set-up for cutting, yet! lol

Just 3 here !!!

I only have two. Maybe I need to go shopping!

24x36
18x24
12" revolving
12x18 for classes

I only have 3
24x36
6x18
and a june tailor combo.
Once i get my sewing study i would like a big one.

2 currently : one 10x12 (scrapbooking mat that I repurposed) and a large green 36x24 or so...... I use both a lot and am in process of getting a 12x12 scrapbooking one to repurpose....I really like that size!

I have 2.

I have:
12 x 12 rotating mat
17 x 17 rotating mat
36 x 58(it fits my cutting table)
24 x 36(I use this one the most)
23 x 35
17 x 23
12 x 18(I use this for class)
11 x 11 cutting/flip ironing mat

3, 6, 8 revolving, 8 x 12, 12(revolving), 12 x 18, 18 x 24, 24 x 36(2)

I have four that I use regularly and two smaller ones that I take for classes. I love love love my rotating mats. Best purchase ever.