| School name | City/
Town | County | Sector | Type | DENI
reference number | References/Comments |
| Abbey Christian Brothers Grammar School | Newry | County Down | Voluntary | Grammar | 542-0059 | |
| Abbey Community College | Newtownabbey | County Antrim | Controlled | Secondary | 321-0313 | |
| All Saints College | Belfast | County Antrim | Voluntary | Secondary | 123-0234 | Merger of St Rose's Dominican College, Christian Brothers School and Corpus Christi College |
| Antrim Grammar School | Antrim | County Antrim | Controlled | Grammar | 341-0209 | |
| Aquinas Diocesan Grammar School | Belfast | County Antrim | Voluntary | Grammar | 142-0277 | |
| Ashfield Boys' High School | Belfast | County Antrim | Controlled | Secondary | 121-0015 | |
| Ashfield Girls' High School | Belfast | County Antrim | Controlled | Secondary | 121-0014 | |
| Assumption Grammar School | Ballynahinch | County Down | Voluntary | Grammar | 442-0086 | |
| Aughnacloy College | Aughnacloy | County Tyrone | Controlled | Secondary | 521-0153 | |
| Ballycastle High School | Ballycastle | County Antrim | Controlled | Secondary | 321-0124 | |
| Ballyclare High School | Ballyclare | County Antrim | Controlled | Grammar | 341-0008 | |
| Ballyclare Secondary School | Ballyclare | County Antrim | Controlled | Secondary | 321-0134 | |
| Ballymena Academy | Ballymena | County Antrim | Voluntary | Grammar | 342-0011 | |
| Ballymoney High School | Ballymoney | County Antrim | Controlled | Secondary | 321-0133 | |
| Banbridge Academy | Banbridge | County Down | Controlled | Grammar | 541-0013 | |
| Banbridge High School | Banbridge | County Down | Controlled | Secondary | 521-0047 | |
| Bangor Academy and Sixth Form College | Bangor | County Down | Controlled | Secondary | 421-0296 | |
| Bangor Grammar School | Bangor | County Down | Voluntary | Grammar | 442-0015 | |
| Belfast Boys' Model School | Belfast | County Antrim | Controlled | Secondary | 121-0022 | |
| Belfast High School | Newtownabbey | County Antrim | Voluntary | Grammar | 342-0077 | |
| Belfast Model School For Girls | Belfast | County Antrim | Controlled | Secondary | 121-0021 | |
| Belfast Royal Academy | Belfast | County Antrim | Voluntary | Grammar | 142-0028 | |
| Blackwater Integrated College | Downpatrick | County Down | Grant Maintained Integrated | Secondary | 426-0309 | |
| Blessed Trinity College | Belfast | County Antrim | Roman Catholic Maintained | Secondary | 123-0321 | |
| Bloomfield Collegiate | Belfast | County Antrim | Controlled | Grammar | 141-0315 | |
| Breda Academy | Belfast | County Antrim | Controlled | Secondary | 421-0316 | |
| Brownlow Integrated College | Craigavon | County Armagh | Controlled Integrated | Secondary | 525-0216 | |
| Cambridge House Grammar School | Ballymena | County Antrim | Controlled | Grammar | 341-0297 | |
| Campbell College | Belfast | County Antrim | Voluntary | Grammar | 142-0020 | |
| Carrickfergus Academy | Carrickfergus | County Antrim | Controlled | Secondary | 321-0323 | |
| Carrickfergus Grammar School | Carrickfergus | County Antrim | Controlled | Grammar | 341-0098 | |
| Castlederg High School | Castlederg | County Tyrone | Controlled | Secondary | 221-0065 | |
| Christian Brothers' Grammar School | Omagh | County Tyrone | Voluntary | Grammar | 242-0064 | |
| City Armagh High School | Armagh | County Armagh | Controlled | Secondary | 521-0121 | |
| Clounagh Junior High School | Portadown | County Armagh | Controlled | Secondary | 521-0043 | |
| Coláiste Feirste | Belfast | County Antrim | Other Maintained | Secondary | 124-0291 | |
| Coleraine College | Coleraine | County Londonderry | Controlled | Secondary | 321-0300 | |
| Coleraine Grammar | Coleraine | County Londonderry | Voluntary | Grammar | 342-0317 | |
| Cookstown High School | Cookstown | County Tyrone | Controlled | Secondary | 521-0230 | |
| Craigavon Senior High School | Portadown | County Armagh | Controlled | Secondary | 521-0282 | |
| Cross and Passion College | Ballycastle | County Antrim | Roman Catholic Maintained | Secondary | 323-0227 | |
| Crumlin Integrated College | Crumlin | County Antrim | Controlled Integrated | Secondary | 325-0149 | |
| Cullybackey College | Ballymena | County Antrim | Controlled | Secondary | 321-0172 | |
| Dalriada School | Ballymoney | County Antrim | Voluntary | Grammar | 342-0012 | |
| De La Salle College | Belfast | County Antrim | Roman Catholic Maintained | Secondary | 123-0182 | |
| Dean Maguirc College | Omagh | County Tyrone | Roman Catholic Maintained | Secondary | 223-0138 | |
| Devenish College | Enniskillen | County Fermanagh | Controlled | Secondary | 221-0312 | |
| Dominican College | Belfast | County Antrim | Voluntary | Grammar | 142-0082 | |
| Dominican College | Portstewart | County Londonderry | Voluntary | Grammar | 342-0068 | |
| Down High School | Downpatrick | County Down | Controlled | Grammar | 441-0085 | |
| Dromore High School | Dromore | County Down | Controlled | Secondary | 521-0064 | |
| Drumglass High School | Dungannon | County Tyrone | Controlled | Secondary | 521-0231 | |
| Drumragh Integrated College | Omagh | County Tyrone | Grant Maintained Integrated | Secondary | 226-0283 | |
| Dunclug College | Ballymena | County Antrim | Controlled | Secondary | 321-0208 | |
| Dundonald High School | Belfast | County Antrim | Controlled | Secondary | 421-0262 | |
| Dunluce School | Bushmills | County Antrim | Controlled | Secondary | 321-0222 | |
| Edmund Rice College | Newtownabbey | County Antrim | Roman Catholic Maintained | Secondary | 323-0203 | |
| Enniskillen Royal Grammar School | Enniskillen | County Fermanagh | Voluntary | Grammar | 242-0320 | |
| Erne Integrated College | Enniskillen | County Fermanagh | Grant Maintained Integrated | Secondary | 226-0280 | |
| Fivemiletown College | Fivemiletown | County Tyrone | Controlled | Secondary | 521-0097 | |
| Fort Hill College | Lisburn | County Antrim | Controlled Integrated | Secondary | 425-0072 | |
| Foyle College | Derry | County Londonderry | Voluntary | Grammar | 242-0229 | |
| Friends' School | Lisburn | County Antrim | Voluntary | Grammar | 442-0050 | |
| Gaelcholáiste Dhoire | Dungiven | County Londonderry | Other Maintained | Secondary | 224-0319 | |
| Glastry College | Newtownards | County Down | Controlled | Secondary | 421-0046 | |
| Glengormley High School | Newtownabbey | County Antrim | Controlled | Secondary | 321-0202 | |
| Glenlola Collegiate | Bangor | County Down | Controlled | Grammar | 441-0097 | |
| Grosvenor Grammar School | Belfast | County Down | Controlled | Grammar | 141-0079 | |
| Hazelwood College | Newtownabbey | County Antrim | Grant Maintained Integrated | Secondary | 126-0269 | |
| Holy Cross College | Strabane | County Tyrone | Roman Catholic Maintained | Secondary | 223-0301 | |
| Holy Trinity College | Cookstown | County Tyrone | Roman Catholic Maintained | Secondary | 523-0278 | |
| Hunterhouse College | Belfast | County Antrim | Voluntary | Grammar | 142-0265 | |
| Integrated College Dungannon | Dungannon | County Tyrone | Grant Maintained Integrated | Secondary | 526-0286 | |
| Kilkeel High School | Newry | County Down | Controlled | Secondary | 521-0016 | |
| Killicomaine Junior High School | Portadown | County Armagh | Controlled | Secondary | 521-0054 | |
| Lagan College | Belfast | County Down | Grant Maintained Integrated | Secondary | 426-0255 | Operates a grammar stream |
| Larne Grammar School | Larne | County Antrim | Voluntary | Grammar | 342-0046 | |
| Larne High School | Larne | County Antrim | Controlled | Secondary | 321-0038 | |
| Laurelhill Community College | Lisburn | County Antrim | Controlled | Secondary | 421-0201 | |
| Lecale Trinity Grammar School | Downpatrick | County Down | Voluntary | Grammar | 442-0325 | Merger with De La Salle High School, St Patricks Grammar School and St Mary's High School |
| Limavady Grammar School | Limavady | County Londonderry | Controlled | Grammar | 241-0048 | |
| Limavady High School | Limavady | County Londonderry | Controlled | Secondary | 221-0302 | |
| Lismore Comprehensive School | Craigavon | County Armagh | Roman Catholic Maintained | Secondary | 523-0213 | |
| Lisnagarvey High School | Lisburn | County Antrim | Controlled | Secondary | 421-0051 | |
| Lisneal College | Derry | County Londonderry | Controlled | Secondary | 221-0306 | |
| Loreto College | Coleraine | County Londonderry | Voluntary | Grammar | 342-0034 | |
| Loreto Grammar School | Omagh | County Tyrone | Voluntary | Grammar | 242-0065 | |
| Lumen Christi College | Derry | County Londonderry | Voluntary | Grammar | 242-0287 | |
| Lurgan College | Craigavon | County Armagh | Controlled | Grammar | 541-0057 | |
| Lurgan Junior High | Lurgan | County Armagh | Controlled | Secondary | 521-0271 | |
| Magherafelt High School | Magherafelt | County Londonderry | Controlled | Secondary | 321-0035 | |
| Malone Integrated College | Belfast | County Antrim | Grant Maintained Integrated | Secondary | 126-0294 | |
| Markethill High School | Armagh | County Armagh | Controlled | Secondary | 521-0083 | |
| Mercy College Belfast | Belfast | County Antrim | Roman Catholic Maintained | Secondary | 123-0104 | |
| Methodist College | Belfast | County Antrim | Voluntary | Grammar | 142-0022 | |
| Mount Lourdes Grammar School | Enniskillen | County Fermanagh | Voluntary | Grammar | 242-0041 | |
| Movilla High School | Newtownards | County Down | Controlled | Secondary | 421-0012 | |
| Nendrum College | Newtownards | County Down | Controlled | Secondary | 421-0045 | |
| New-Bridge Integrated College | Banbridge | County Down | Grant Maintained Integrated | Secondary | 526-0285 | |
| Newry High School | Newry | County Down | Controlled | Secondary | 521-0186 | |
| Newtownhamilton High School | Newry | County Down | Controlled | Secondary | 521-0025 | |
| North Coast Integrated College | Coleraine | County Londonderry | Grant Maintained Integrated | Secondary | 326-0290 | |
| Oakgrove Integrated College | Derry | County Londonderry | Grant Maintained Integrated | Secondary | 226-0276 | |
| Omagh Academy | Omagh | County Tyrone | Controlled | Grammar | 241-0066 | |
| Omagh High School | Omagh | County Tyrone | Controlled | Secondary | 221-0125 | |
| Our Lady and St Patrick's College | Belfast | County Antrim | Voluntary | Grammar | 442-0259 | |
| Our Lady of Lourdes High School | Ballymoney | County Antrim | Roman Catholic Maintained | Secondary | 323-0075 | |
| Our Lady's Grammar School | Newry | County Down | Voluntary | Grammar | 542-0060 | |
| Parkhall Integrated College | Antrim | County Antrim | Controlled Integrated | Secondary | 325-0207 | |
| Portadown College | Craigavon | County Armagh | Controlled | Grammar | 541-0067 | |
| Priory Integrated College | Holywood | County Down | Controlled Integrated | Secondary | 425-0024 | |
| Rainey Endowed School | Magherafelt | County Londonderry | Voluntary | Grammar | 342-0058 | |
| Rathfriland High School | Newry | County Down | Controlled | Secondary | 521-0127 | |
| Rathmore Grammar School | Belfast | County Antrim | Voluntary | Grammar | 142-0095 | |
| Regent House School | Newtownards | County Down | Controlled | Grammar | 441-0063 | |
| Royal Belfast Academical Institution | Belfast | County Antrim | Voluntary | Grammar | 142-0027 | |
| Sacred Heart College | Omagh | County Tyrone | Roman Catholic Maintained | Secondary | 223-0298 | |
| Sacred Heart Grammar School | Newry | County Down | Voluntary | Grammar | 542-0076 | |
| Saintfield High School | Saintfield | County Down | Controlled | Secondary | 421-0063 | |
| Shimna Integrated College | Newcastle | County Down | Grant Maintained Integrated | Secondary | 426-0281 | |
| Slemish College | Ballymena | County Antrim | Grant Maintained Integrated | Secondary | 326-0289 | Operates a grammar stream |
| Sperrin Integrated College | Magherafelt | County Londonderry | Grant Maintained Integrated | Secondary | 326-0303 | |
| St Aidan's High School, Derrylin | Derrylin | County Fermanagh | Roman Catholic Maintained | Secondary | 223-0166 | |
| St Benedict's College | Randalstown | County Antrim | Roman Catholic Maintained | Secondary | 323-0308 | |
| St Brigid's College | Derry | County Londonderry | Roman Catholic Maintained | Secondary | 223-0225 | |
| St Catherine's College | Armagh | County Armagh | Roman Catholic Maintained | Secondary | 523-0218 | |
| St Cecilia's College | Derry | County Londonderry | Roman Catholic Maintained | Secondary | 223-0188 | |
| St Ciaran's High School | Ballygawley | County Tyrone | Roman Catholic Maintained | Secondary | 523-0152 | |
| St Colman's College | Newry | County Down | Voluntary | Grammar | 542-0062 | |
| St Colman's High and Sixth Form College | Ballynahinch | County Down | Roman Catholic Maintained | Secondary | 423-0161 | |
| St Colmcille's High School | Crossgar | County Down | Roman Catholic Maintained | Secondary | 423-0102 | |
| St Colm's High School | Belfast | County Antrim | Roman Catholic Maintained | Secondary | 423-0223 | |
| St Colm's High School Draperstown | Draperstown | County Londonderry | Roman Catholic Maintained | Secondary | 323-0132 | |
| St Columbanus' College | Bangor | County Down | Roman Catholic Maintained | Secondary | 423-0107 | |
| St Columba's College, Portaferry | Portaferry | County Down | Roman Catholic Maintained | Secondary | 423-0067 | |
| St Columb's College | Derry | County Londonderry | Voluntary | Grammar | 242-0054 | |
| St Conor's College | Portglenone | County Antrim | Roman Catholic Maintained | Secondary | 323-0318 | |
| St Dominic's Grammar School for Girls | Belfast | County Antrim | Voluntary | Grammar | 142-0029 | |
| St Fanchea's College | Enniskillen | County Fermanagh | Roman Catholic Maintained | Secondary | 223-0099 | |
| St Genevieve's High School | Belfast | County Antrim | Roman Catholic Maintained | Secondary | 123-0155 | |
| St John the Baptist College | Armagh | County Armagh | Roman Catholic Maintained | Secondary | 523-0321 | |
| St John's Business and Enterprise College | Omagh | County Tyrone | Roman Catholic Maintained | Secondary | 223-0148 | |
| St Joseph's Boys' High School | Newry | County Down | Roman Catholic Maintained | Secondary | 523-0056 | |
| St Joseph's Boys' School | Derry | County Londonderry | Roman Catholic Maintained | Secondary | 223-0131 | |
| St Joseph's College, Belfast | Belfast | County Antrim | Roman Catholic Maintained | Secondary | 123-0275 | |
| St Joseph's College, Enniskillen | Enniskillen | County Fermanagh | Roman Catholic Maintained | Secondary | 223-0100 | |
| St Joseph's College | Coleraine | County Londonderry | Roman Catholic Maintained | Secondary | 323-0110 | merged |
| St Joseph's College, Coalisland | Coalisland | County Tyrone | Roman Catholic Maintained | Secondary | 523-0192 | |
| St Joseph's Grammar School | Donaghmore | County Tyrone | Voluntary | Grammar | 542-0073 | |
| St Joseph's High School | Crossmaglen | County Armagh | Roman Catholic Maintained | Secondary | 523-0167 | |
| St Kevin's College, Belleek | Belleek | County Fermanagh | Roman Catholic Maintained | Secondary | 223-0322 | |
| St Killian's College | Ballymena | County Antrim | Roman Catholic Maintained | Secondary | 323-0310 | |
| St Louis Grammar School | Ballymena | County Antrim | Voluntary | Grammar | 342-0010 | |
| St Louis Grammar School | Kilkeel | County Down | Voluntary | Grammar | 542-0045 | |
| St Louise's Comprehensive College | Belfast | County Antrim | Roman Catholic Maintained | Secondary | 123-0053 | |
| St Malachy's College | Belfast | County Antrim | Voluntary | Grammar | 142-0030 | |
| St Malachy's High School | Castlewellan | County Down | Roman Catholic Maintained | Secondary | 423-0211 | |
| St Mark's High School | Warrenpoint | County Down | Roman Catholic Maintained | Secondary | 523-0135 | |
| St Mary's Christian Brothers' Grammar School | Belfast | County Antrim | Voluntary | Grammar | 142-0021 | |
| St Mary's College | Derry | County Londonderry | Roman Catholic Maintained | Secondary | 223-0081 | |
| St Mary's College, Irvinestown | Irvinestown | County Fermanagh | Roman Catholic Maintained | Secondary | 223-0109 | |
| St Mary's Grammar School | Magherafelt | County Londonderry | Voluntary | Grammar | 342-0080 | |
| St Mary's High School, Brollagh | Brollagh | County Fermanagh | Roman Catholic Maintained | Secondary | 223-0085 | |
| St Mary's High School | Newry | County Down | Roman Catholic Maintained | Secondary | 523-0108 | |
| St Mary's High School, Limavady | Limavady | County Londonderry | Roman Catholic Maintained | Secondary | 223-0077 | |
| St Michael's College | Enniskillen | County Fermanagh | Voluntary | Grammar | 242-0043 | |
| St Patricks & St Brigids College | Derry | County Londonderry | Roman Catholic Maintained | Secondary | 223-0122 | |
| St Patrick's Academy | Dungannon | County Tyrone | Voluntary | Grammar | 542-0304 | |
| St Patrick's Academy | Lisburn | County Antrim | Roman Catholic Maintained | Secondary | 423-0165 | |
| St Patrick's Co-ed Comprehensive College | Maghera | County Londonderry | Roman Catholic Maintained | Secondary | 323-0234 | |
| St Patrick's College | Derry | County Londonderry | Roman Catholic Maintained | Secondary | 223-0144 | |
| St Patrick's College, Ballymena | Ballymena | County Antrim | Roman Catholic Maintained | Secondary | 323-0084 | |
| St Patrick's College, Banbridge | Banbridge | County Down | Roman Catholic Maintained | Secondary | 523-0076 | |
| St Patrick's College | Dungannon | County Tyrone | Roman Catholic Maintained | Secondary | 523-0293 | |
| St Patrick's Grammar School | Armagh | County Armagh | Voluntary | Grammar | 542-0268 | |
| St Patrick's High School | Keady | County Armagh | Roman Catholic Maintained | Secondary | 523-0187 | |
| St Paul's High School, Bessbrook | Bessbrook | County Down | Roman Catholic Maintained | Secondary | 523-0157 | |
| St Pius X College | Magherafelt | County Londonderry | Roman Catholic Maintained | Secondary | 323-0168 | |
| St Ronan's College | Lurgan | County Armagh | Voluntary | Grammar | 542-0314 | |
| Strabane Academy | Strabane | County Tyrone | Controlled | Grammar | 241-0311 | |
| Strangford Integrated College | Carrowdore | County Down | Grant Maintained Integrated | Secondary | 426-0295 | Operates a grammar stream |
| Strathearn School | Belfast | County Antrim | Voluntary | Grammar | 142-0089 | |
| Sullivan Upper School | Holywood | County Down | Voluntary | Grammar | 442-0044 | |
| Tandragee Junior High School | Tandragee | County Armagh | Controlled | Secondary | 521-0143 | |
| The High School Ballynahinch | Ballynahinch | County Down | Controlled | Secondary | 421-0029 | |
| The Royal School Armagh | Armagh | County Armagh | Voluntary | Grammar | 542-0263 | |
| The Royal School Dungannon | Dungannon | County Tyrone | Voluntary | Grammar | 542-0260 | |
| Thornhill College | Derry | County Londonderry | Voluntary | Grammar | 242-0052 | |
| Ulidia Integrated College | Carrickfergus | County Antrim | Grant Maintained Integrated | Secondary | 326-0299 | |
| Victoria College | Belfast | County Antrim | Voluntary | Grammar | 142-0264 | |
| Wallace High School | Lisburn | County Antrim | Voluntary | Grammar | 442-0051 | |
| Wellington College | Belfast | County Antrim | Controlled | Grammar | 141-0270 | |