Map & Directions
Principia School
Directions from St. Louis International Airport:
Turn right onto Lambert International Blvd. Turn left to merge onto I-70 W. Take exit 232A-232B and merge onto I-270 S toward Memphis. Take Exit 12 toward Wentzville and merge onto I-64 W/US-40 W. Take Exit 24 at Mason Road and turn left. From Mason Road turn left onto Clayton Road. Turn left at the second Principia entrance. (There will be a Gate House at this entrance.)
Principia School, 13201 Clayton Road, St. Louis, MO 63131, 314.434.2100
Principia College
Principia College is located in Elsah, Illinois, 12 miles north of Alton, off the Great River Road, Route 100. To reach the campus entrance coming from Alton on Route 100, turn right at Elsah Road, bearing right to Mill Street. Go halfway through the Village of Elsah to the first stop sign. Turn right and go up the hill.