| School Name | Street_Address | City | State |
| La Pietra-Hawaii School for Girls |
2933 Poni Moi Road
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Honolulu | HI |
| Lake Forest Academy |
1500 W. Kennedy Road
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Lake Forest | IL |
| Lake Forest Country Day School |
145 South Green Bay Road
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Lake Forest | IL |
| Lake Highland Preparatory School |
901 N. Highland Avenue
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Orlando | FL |
| Lakeside School |
14050 1st Avenue, NE
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Seattle | WA |
| Landmark School |
412 Hale Street, Prides Crossing, MA (Upper School))
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Manchester | MA |
| Langley School |
1411 Balls Hill Road
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McLean | VA |
| Lawrence Academy |
26 Powderhouse Road, P.O. Box 992
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Groton | MA |
| Lawrence Woodmere Academy |
336 Woodmere Blvd.
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Woodmere | NY |
| Lawrenceville School Top 25 |
2500 Main Street, Mackenzie Building
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Lawrenceville | NJ |
| Le Jardin Academy |
917 Kalanianaole Hwy
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Kailua | HI |
| Lehrman Community Day School |
727 77th Street
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Miami Beach | FL |
| Lexington Christian Academy |
48 Bartlett Avenue
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Lexington | MA |
| Lick-Wilmerding High School |
755 Ocean Avenue
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San Francisco | CA |
| Lincoln School |
301 Butler Avenue
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Providence | RI |
| Linden Hall |
212 East Main Street
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Lititz | PA |
| Live Oak School |
1555 Mariposa Street
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San Francisco | CA |
| Loomis Chaffee School |
4 Batchelder Road
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Windsor | CT |
| Loudoun Country Day School |
20600 Red Cedar Drive
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Leesburg | VA |
| Lovett School |
4075 Paces Ferry Road, NW
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Atlanta | GA |
| Lowell School |
1640 Kalmia Road, NW
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Washington | DC |
| Loyola School |
980 Park Ave
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New York | NY |
| Lutheran High School of Hawaii |
1404 University Avenue
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Honolulu | HI |
| Lyndon Institute |
P.O. Box 127, College Road
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Lyndon Center | VT |