From wikipedia:
Alberton Elementary Alberton Prince K 6 ELSB Westisle
Amherst Cove Borden-Carleton Prince K 8 ELSB Kinkora
Athena Consolidated Summerside Prince K 9 ELSB Three Oaks
Belfast Consolidated Belfast Queens K 9 ELSB Montague
Birchwood Intermediate Charlottetown Queens 7 9 ELSB Colonel Gray
Bloomfield Elementary Bloomfield Prince K 6 ELSB Westisle
Bluefield High Hampshire Queens 10 12 ELSB Bluefield
Cardigan Consolidated Cardigan Kings K 6 ELSB Montague
Central Queens Hunter River Queens K 6 ELSB Bluefield
Charlottetown Rural Charlottetown Queens 10 12 ELSB Charlottetown 1965
Colonel Gray Charlottetown Queens 10 12 ELSB Colonel Gray 1968
Donagh Regional Donagh Queens K 9 ELSB Charlottetown
East Wiltshire Cornwall Queens 7 9 ELSB Bluefield
Eliot River Cornwall Queens 4 6 ELSB Bluefield
Ellerslie Ellerslie-Bideford Prince K 6 ELSB Westisle
Elm Street Summerside Prince K 6 ELSB Three Oaks
Englewood Crapaud Queens K 9 ELSB Bluefield
Evangéline Wellington Prince K 12 CSLF Evangéline
François-Buote Charlottetown Queens K 12 CSLF François-Buote
Georgetown Elementary Georgetown Kings K 8 ELSB Montague
Glen Stewart Stratford Queens K 3 ELSB Charlottetown
Greenfield Elementary Summerside Prince K 6 ELSB Three Oaks
Gulf Shore North Rustico Queens K 9 ELSB Bluefield
Kensington Intermediate Kensington Prince 7 12 ELSB Kensington 1955
Kinkora Regional Kinkora Prince 9 12 ELSB Kinkora 1935
L. M. Montgomery Charlottetown Queens K 6 ELSB Charlottetown
La-Belle-Cloche Souris Kings K 12 CSLF La-Belle-Cloche
Merritt E. Callaghan Tignish Prince 7 9 ELSB Westisle 1976
Montague Regional Montague Kings 10 12 ELSB Montague 2010
Morell Regional Morell Kings 9 12 ELSB Morell
Parkdale Elementary Charlottetown Queens K 6 ELSB Charlottetown
Prince Street Charlottetown Queens K 6 ELSB Charlottetown
Pierre-Chiasson Deblois Prince K 12 CSLF Evangéline
Queen Charlotte Charlottetown Queens 7 9 ELSB Charlottetown
Queen Elizabeth Elementary School Kensington, Prince Edward Island Prince K 6 ELSB Kensington
Sherwood Elementary Charlottetown Queens K 6 ELSB Charlottetown
Souris Regional Souris Kings K 12 ELSB Souris 1955
St-Augustin Hunter River Queens K 6 CSLF François-Buote
Stonepark Intermediate Charlottetown Queens 7 9 ELSB Charlottetown
Stratford Elementary Charlottetown Queens 4 6 ELSB Charlottetown
Sur-Mer Summerside Prince K 8 CSLF Évangéline
Three Oaks Summerside Prince 10 12 ELSB Three Oaks 1976
Westisle Composite Rosebank Prince 10 12 ELSB Westisle 1979
Westwood Primary Cornwall Queens K 3 ELSB Bluefield
Vernon River Vernon River Queens K 9 ELSB Montague
Thank you. https://www.thestar.com/news/canada/2016/09/21/all-prince-edward-island-schools-evacuated-over-potential-threat.html
This was updated about 15 minutes ago.