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Charlottenburgh & Lancaster District High School
- Short Hand: CLDHS
- Classification: A
- Association: SDGAA
- Nick Name: Crusaders
- Colours: Royal Blue & Yellow
- Population: 201
- Phone Number: 6133472441
- Address: 19743 County Road 17 Williamstown K0C 2J0
- Website: https://char-lan.ucdsb.on.ca/
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Principal
Trevor Wheeler Email: Trevor.wheeler@ucdsb.on.ca -
Contacts
Kelsey MacDonald Email: Kelsey.macdonald@ucdsb.on.ca
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École secondaire publique L'Héritage
- Short Hand: ÉSPLH
- Classification: A
- Association: SDGAA
- Nick Name: Dragons
- Colours: White and Purple
- Population: 195
- Phone Number: 6139333318
- Address: 1111 Montreal road Cornwall K6H 4M1
- Website: https://heritage.cepeo.on.ca/
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Principal
Marc Hurtubise Email: marc.hurtubise@cepeo.on.ca -
Contacts
Marc Hurtubise Email: marc.hurtubise@cepeo.on.ca
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St. Lawrence Secondary School
- Short Hand: LSS
- Classification: AA
- Association: SDGAA
- Nick Name: Saints
- Colours: Blue, White, and Gold
- Population: 499
- Address: 1450 Second St. E Cornwall K6H 5Z8
- Website: https://stlawrence.ucdsb.on.ca/
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Principal
Ryne Gove Email: ryne.gove@ucdsb.on.ca -
Contacts
Jamie Carr Email: jamie.carr@ucdsb.on.ca Stephane St. Denis Email: stephane.stdenis@ucdsb.on.ca
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St. Joseph Catholic Secondary School
- Short Hand: JCSC
- Classification: AA
- Association: SDGAA
- Nick Name: Panthers
- Colours: Navy, Red, and White
- Population: 715
- Address: 1500 Cumberland St. Cornwall K6J 5V9
- Website: https://sjcss.cdsbeo.on.ca/
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Principal
Joy Martel Email: joy.martel@cdsbeo.on.ca -
Contacts
Jack Chisholm Email: jack.chisholm@cdsbeo.on.ca
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Glengarry District High School
- Short Hand: GDHS
- Classification: A
- Association: SDGAA
- Nick Name: Gaels
- Colours: Red & Black
- Population: 233
- Phone Number: 6135251066
- Address: 212 Main St. N. Alexandria K0C 1A0
- Website: https://glengarry.ucdsb.on.ca/
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Principal
Kimberly Swerdfeger Email: Kimberly.swerdfeger@ucdsb.on.ca -
Contacts
Katherine Adams Email: katherine.adams@ucdsb.on.ca Callie Smith Email: callie.smith@ucdsb.on.ca
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North Dundas District High School
- Short Hand: NDDHS
- Classification: A
- Association: SDGAA
- Nick Name: Devils
- Colours: Navy and White
- Population: 379
- Phone Number: 6134482328
- Address: RR#3 Chesterville 12835 County Rd 43
- Website: https://northdundas.ucdsb.on.ca/
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Principal
Trent Carter-Edwards Email: trent.carter-edwards@ucdsb.on.ca -
Contacts
Corey Tinkess Email: corey.tinkess@ucdsb.on.ca
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Holy Trinity Catholic Secondary School
- Short Hand: HTCSS
- Classification: AA
- Association: SDGAA
- Nick Name: Falcons
- Colours: Forest Green, Notre Dame Gold, & White
- Population: 522
- Phone Number: 6139360319
- Address: 18044 Tyotown Rd Cornwall K6H 5S7
- Website: https://holytrinityfalcons.cdsbeo.on.ca/
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Principal
Nancy McIntyre Email: nancy.mcintyre@cdsbeo.on.ca -
Contacts
Marc Poirier Email: marc.poirier@cdsbeo.on.ca Brandon Labelle Email: brandon.labelle@cdsbeo.on.ca
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St. Matthew Catholic Secondary School
- Short Hand: MCSS
- Classification: A
- Association: SDGAA
- Nick Name: Phoenix
- Colours: Gold and Garnet
- Population: 128
- Address: 822 Marlborough St. N. Cornwall K6H 4B4
- Website: https://stmatthew.cdsbeo.on.ca/
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Principal
Patrick McLeod Email: patrick.mcleod@cdsbeo.on.ca -
Contacts
Anna Parks Email: anna.parks@cdsbeo.on.ca Bevin Burnie Email: burnieb@cdsbeo.on.ca
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Cornwall Collegiate and Vocational School
- Short Hand: CCVS
- Classification: AA
- Association: SDGAA
- Nick Name: Raiders
- Colours: Gold / Black / Red
- Population: 575
- Phone Number: 6139328360
- Address: 437 Sydney St. Cornwall K6H 3H9
- Website: https://ccvs.ucdsb.on.ca/
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Principal
Jana Hart Email: jana.hart@ucdsb.on.ca -
Contacts
Ian Wilson Email: ian.wilson@ucdsb.on.ca Ryan Wilkes Email: ryan.wilkes@ucdsb.on.ca
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Tagwi Secondary School
- Short Hand: TSS
- Classification: A
- Association: SDGAA
- Nick Name: Warriors
- Colours: Powder Blue and White
- Population: 493
- Address: RR 1 Avonmore K0C 1C0
- Website: https://tagwi.ucdsb.on.ca/
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Principal
Michael Deighton Email: michael.deighton@ucdsb.on.ca -
Contacts
Marc Mainville Email: marc.mainville@ucdsb.on.ca
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École secondaire catholique La Citadelle
- Short Hand: ÉSCLC
- Classification: A
- Association: SDGAA
- Nick Name: Patriotes
- Colours: Red, White and Blue
- Population: 465
- Phone Number: 6139330172
- Address: 510 McConnell ave. Cornwall K6H 1E1
- Website: https://lacitadelle.csdceo.ca/
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Principal
Daniel Legros Email: daniel.legros@csdceo.org -
Contacts
Alain Parthenais Email: alain.parthenais@csdceo.org
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Seaway District High School
- Short Hand: SDHS
- Classification: A
- Association: SDGAA
- Nick Name: Spartans
- Colours: Orange & Black
- Population: 259
- Address: 2 Beach Ave. Iroquois K0E 1K0
- Website: https://seaway.ucdsb.on.ca/
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Principal
Trevor Holme Email: trevor.holme@ucdsb.on.ca -
Contacts
Trevor Thompson Email: trevor.thompson@ucdsb.on.ca Lindsay Kennedy Email: Lindsay.Kennedy@ucdsb.on.ca