Based on a quick run through the catalog and schedule listings…
Bowdoin: it seems amazingly hard to find the math course titles and descriptions on its web site.
Carleton: about 20 junior/senior level math courses. 3 of these are statistics. 6-7 offered per quarter.
Hamiton: about 14 junior/senior level math courses. 2 of these are statistics, 1 is CS theory (cryptography). 3-7 are offered per semester.
Harvey Mudd: about 32 junior/senior level math courses; in addition, the frosh/soph level math courses are proof-based. 6 of these are statistics, 8 are applied topics, and 2 are CS theory. 12-15 are offered per semester. Also has 3 courses explicitly labeled as graduate level, but some graduate level topics appear to be covered in other courses as well.
Reed: about 30 junior/senior level math courses. 5 of these are statistics, 7 are CS. 12 are offered per semester. Note: Reed’s math department begins proof-based math earlier in the curriculum than most other math departments, so these courses are counted here.
St. Olaf: about 13 junior/senior level math courses. 1 of these is statistics, 2 are applied topics. 5-8 are offered per semester.
Swarthmore: about 18 junior/senior level math courses, not including statistics (which is a separate course subject). 5-9 are offered per semester.
Wesleyan: about 12 junior/senior level math courses. 1 of these is statistics. 4-8 are offered per semester. Also has 12 graduate level math courses, of which 6 are offered per semester. (Yes, “Analysis I”, “Analysis II”, “Topology I”, “Topology II”, “Algebra I”, and “Algebra II” all refer to both the fall and spring courses of year long sequences, so these 6 titles are for 12 courses.)