Category: Disambiguation The Boston-area Independent School League is the oldest Independent School athletic association in the United States. ... First Flag of New England, 1686-c. ... In the United States a preparatory school, or prep school, is usually a private secondary school (or high school) designed to prepare a student for higher education. ... The Independent School League or ISL is a group of seventeen United States, (Washington, DC-area), preparatory schools that compete with each other athletically. ... Aerial photo (looking NW) of the Washington Monument and the White House in Washington, DC. Washington, D.C., officially the District of Columbia (also known as D.C.; Washington; the Nations Capital; the District; and, historically, the Federal City) is the capital city and administrative district of the United... In the United States a preparatory school, or prep school, is usually a private secondary school (or high school) designed to prepare a student for higher education. ... The Independent School League (ISL) in Illinois comprises 32 schools in Chicagoland. ... Official language(s) English Capital Springfield Largest city Chicago Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 25th 149,998 km² 340 km 629 km 4. ... In the United States a preparatory school, or prep school, is usually a private secondary school (or high school) designed to prepare a student for higher education. ... The Interscholastic League of Honolulu or ILH is an athletic conference composed of private secondary schools in Honolulu, Hawaii. ...