| School Name | Street Address | City | State |
| C.F.S. - The School at Church Farm |
1001 East Lincoln Highway, Business Route 30
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Exton | PA |
| Canterbury School |
101 Aspetuck Avenue
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New Milford | CT |
| Canyonville Christian Academy |
250 East 1st Street
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Canyonville | OR |
| Cardigan Mountain School |
62 Alumni Drive
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Canaan | NH |
| Cate School |
1960 Cate Mesa Road
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Carpinteria | CA |
| Chaminade College Preparatory School |
425 South Lindbergh Boulevard
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St. Louis | MO |
| Chapel Hill-Chauncy Hall School |
785 Beaver Street
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Waltham | MA |
| Cheshire Academy |
10 Main Street
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Cheshire | CT |
| Choate Rosemary Hall Top 25 |
333 Christian Street
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Wallingford | CT |
| Christ School |
500 Christ School Road
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Arden | NC |
| Colorado Rocky Mountain School |
500 Holden Way
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Carbondale | CO |
| Colorado Timberline Academy |
454 Academy Drive
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Durango | CO |
| Concord Academy |
166 Main Street
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Concord | MA |
| Cranbrook Schools |
39221 Woodward Avenue
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Bloomfield Hills | MI |
| Cushing Academy |
Box 8000 , 39 School Street
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Ashburnham | MA |