| School Name | Street Address | City | State |
| Lake Forest Academy |
1500 W. Kennedy Road
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Lake Forest | IL |
| Landmark School |
412 Hale Street, Prides Crossing, MA (Upper School))
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Manchester | MA |
| Lawrenceville School Top 25 |
2500 Main Street, Mackenzie Building
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Lawrenceville | NJ |
| Lexington Christian Academy |
48 Bartlett Avenue
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Lexington | MA |
| Linden Hall |
212 East Main Street
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Lititz | PA |
| Loomis Chaffee School |
4 Batchelder Road
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Windsor | CT |
| Lyndon Institute |
P.O. Box 127, College Road
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Lyndon Center | VT |