# School City, state Students per class year Class year Source
1 Noble and Greenough School Dedham, MA 4.6
23 over 5 class years
2021–2025 School's published list
2 Phillips Academy (Andover) Andover, MA 4.0
4 over 1 class year
Class of 2024 School's published list
3 St Ann'S School Brooklyn, NY 3.0
3 over 1 class year
CLASS OF 2024 School's published list
4 The Mountain School of Milton Academy Vershire, VT 2.8
14 over 5 class years
2021-2025 School's published list
5 The Brearley School New York, NY 2.6
13 over 5 class years
2022–2026 School's published list
6 Collegiate School New York, NY 2.2
11 over 5 class years
2022-2026 School's published list
7 Ethical Culture Fieldston School New York, NY 2.2
11 over 5 class years
Classes of 2022–2026 School's published list
8 College Preparatory School Oakland, CA 2.0
10 over 5 class years
the last five years School's published list
9 Northfield Mount Hermon Mount Hermon, MA 2.0
8 over 4 class years
the past four years School's published list
10 Berkshire School Sheffield, MA 2.0
2 over 1 class year
Class of 2021 School's published list
11 Harvard-Westlake School Studio City, CA 2.0
2 over 1 class year
BY THE CLASSES OF 2021-2025 School's published list
12 The Williston Northampton School Easthampton, MA 2.0
2 over 1 class year
Class of 2026 / Classes of 2022-2025 School's published list
13 The Lawrenceville School Lawrenceville, NJ 1.8
9 over 5 class years
the last five years School's published list
14 The Pingry School Basking Ridge, NJ 1.8
7 over 4 class years
2022-2025 School's published list
15 The Potomac School Mclean, VA 1.8
7 over 4 class years
past four years School's published list
16 Dalton School New York, NY 1.7
10 over 6 class years
2019-2024 School's published list
17 Choate Rosemary Hall Wallingford, CT 1.6
8 over 5 class years
IN THE PAST FIVE YEARS, (CLASS OF 2022-2026) School's published list
18 Lakeside School Seattle, WA 1.6
8 over 5 class years
2021-2025 School's published list
19 Poly Prep Country Day School Brooklyn, NY 1.6
8 over 5 class years
Classes of 2022-2026 School's published list
20 Riverdale Country School Bronx, NY 1.5
9 over 6 class years
Higher Ed Enrollment 2021-2026 School's published list
21 Menlo School Atherton, CA 1.3
4 over 3 class years
Classes of 2023-2025 School's published list
22 Belmont Hill School Belmont, MA 1.2
6 over 5 class years
2022-2026 School's published list
23 Groton School Groton, MA 1.2
6 over 5 class years
2022–2026 School's published list
24 Maret School Washington, DC 1.2
6 over 5 class years
classes of 2022–2026 School's published list
25 Spence School New York, NY 1.2
6 over 5 class years
Classes of 2021 - 2025 School's published list
26 The Rivers School Weston, MA 1.2
6 over 5 class years
2022-2026 School's published list
27 Nightingale-Bamford School New York, NY 1.2
5 over 4 class years
2022–2025 School's published list
28 Packer Collegiate Institute Brooklyn, NY 1.0
5 over 5 class years
2021 - 2025 School's published list
29 The Head-Royce School Oakland, CA 1.0
5 over 5 class years
(2021–25) School's published list
30 University School of Nashville Nashville, TN 1.0
4 over 4 class years
2022-2025 School's published list
31 Kent School Kent, CT 1.0
3 over 3 class years
College Matriculations 2023-2025 School's published list
32 Blair Academy Blairstown, NJ 1.0
1 over 1 class year
Class of 2026 School's published list
33 Brunswick School Greenwich, CT 1.0
1 over 1 class year
Class of 2026 Matriculation; Composite Matriculation List of 2022-2026 School's published list
34 Commonwealth School Boston, MA 1.0
1 over 1 class year
Class of 2022 School's published list
35 Community School of Naples Naples, FL 1.0
1 over 1 class year
class of 2026 School's published list
36 Delbarton School Morristown, NJ 1.0
1 over 1 class year
Class of 2026 School's published list
37 Fenwick High School Oak Park, IL 1.0
1 over 1 class year
Class of 2025 School's published list
38 Friends School of Baltimore Baltimore, MD 1.0
1 over 1 class year
Class of 2026 School's published list
39 Isidore Newman School New Orleans, LA 1.0
1 over 1 class year
Class of 2026 School's published list
40 Marlborough School Los Angeles, CA 1.0
1 over 1 class year
Class of 2026 School's published list
41 Paideia School Atlanta, GA 1.0
1 over 1 class year
Class of 2026 School's published list
42 Peddie School Hightstown, NJ 1.0
1 over 1 class year
Class of 2026 School's published list
43 Rowland Hall Salt Lake City, UT 1.0
1 over 1 class year
Class of 2026 School's published list
44 Rye Country Day School Rye, NY 1.0
1 over 1 class year
Class of 2026 School's published list
45 St. Paul Academy and Summit School St. Paul, MN 1.0
1 over 1 class year
Class of 2025 School's published list
46 The Bryn Mawr School Baltimore, MD 1.0
1 over 1 class year
Class of 2026 School's published list
47 The International School of San Francisco San Francisco, CA 1.0
1 over 1 class year
Class of 2026 School's published list
48 The Pembroke Hill School - Wornall Campus Kansas City, MO 1.0
1 over 1 class year
Class of 2026 School's published list
49 Western Reserve Academy Hudson, OH 1.0
1 over 1 class year
Class of 2026 School's published list
50 Greens Farms Academy Westport, CT 0.8
4 over 5 class years
Class of 2022-2026 School's published list

The 50 largest of 113 ranked private schools.

Also published, with a total but no class-year window we can read, so not ranked: St Andrew'S School (8).

All schools, public and private, and the lists of colleges that admitted each school's graduates, are on the Williams College feeder leaderboard. More about the college: Williams College.

Each count is copied from a list the school published about its own graduates: where they enrolled, one student at one college. The ranked figure is that count divided by the class years the school's list covers. A school that is not on this page did not publish a numbered matriculation list we could read — that is all absence means here. It is never a statement about a school's graduates. Lists of acceptances (where students were admitted, not where they enrolled) are never counted in this ranking: an acceptances list runs about three times an enrollment list, so counting the two together would compare different things. Those lists are ranked on their own, separately.