I used to make cone wrenches, and unless something changed since then, the only other size cone wrench needed is 15mm and those are actually fairly rare.

There are also 16 and 17mm locknuts (no cones that I know of) but you don't strictly need cone wrenches for these, as they're regular hex nuts and can be turned with a regular open end or box wrench.

BTW- be aware that 13mm and 13mm cone hubs often have locknuts that need a cone wrench also, so at least 13 and 14 need to be doubled. In summary, you need 2x13, 2x14, 1x15 (or 2), plus 16 and 17mm in either a cone or open end wrench.