| Maldon Primary School143122 | Primary | Good | 50.3% | 171 |
| Maltese Road Primary School141511 | Primary | Good | 12.8% | 211 |
| Manningtree High School137945 | Secondary | Good | 13.3% | 908 |
| Manuden Primary School114979 | Primary | Good | 0.9% | 106 |
| Maple Grove Primary School144349 | Primary | Expected standard | 41.7% | 295 |
| Margaretting Church of England Voluntary Controlled Primary School146242 | Primary | Good | 24.3% | 70 |
| Mark Hall Academy148423 | Secondary | Requires Improvement | 27.7% | 867 |
| Market Field School143589 | Not applicable | Good | 44.5% | 519 |
| Matching Green Church of England Voluntary Controlled Primary School115126 | Primary | Good | 10.9% | 92 |
| Mayflower High School137048 | Secondary | Expected standard | 10.6% | 1,616 |
| Maylandsea Primary School142254 | Primary | Good | 12.0% | 217 |
| Meadgate Primary School140375 | Primary | Good | 18.6% | 210 |
| Merrylands Primary School143205 | Primary | Good | 23.3% | 542 |
| Mersea Island School115311 | Primary | Good | 18.7% | 394 |
| Messing Primary School139252 | Primary | Good | 16.9% | 89 |
| Mid Essex Co-Operative Academy143591 | Not applicable | Good | 59.6% | 57 |
| Mildmay Primary School146980 | Primary | Good | 12.7% | 611 |
| Milldene Primary School114760 | Primary | Good | 22.7% | 185 |
| Millfields Primary School115261 | Primary | Good | 6.5% | 217 |
| Millhouse Primary School114912 | Primary | Good | 33.8% | 611 |
| Milwards Primary School and Nursery144631 | Primary | Good | 31.0% | 226 |
| Minerva Independent School149506 | Not applicable | — | — | 1 |
| Monkwick Infant and Nursery School140735 | Primary | Good | 31.0% | 149 |
| Monkwick Junior School145020 | Primary | Good | 41.0% | 234 |
| Montgomerie Primary School141182 | Primary | Good | 18.9% | 201 |
| Montgomery Primary School, Colchester114750 | Primary | Good | 17.9% | 608 |
| Moreton Church of England Voluntary Aided Primary School115188 | Primary | Good | 7.9% | 191 |
| Moulsham High School136863 | Secondary | Good | 12.4% | 1,662 |
| Moulsham Infant School136855 | Primary | Good | 14.2% | 268 |
| Moulsham Junior School137971 | Primary | Good | 13.7% | 686 |
| Mountnessing Church of England Primary School145773 | Primary | Good | 15.7% | 191 |
| Myland Community Primary School114708 | Primary | Good | 8.5% | 307 |
| Nazeing Primary School151971 | Primary | Good | 17.6% | 250 |
| New Hall School115387 | Not applicable | — | — | 1,364 |
| Newhall Primary Academy145880 | Primary | Good | 10.1% | 497 |
| Newlands Spring Primary and Nursery School138533 | Primary | Good | 14.6% | 479 |
| Newport Primary School114985 | Primary | Good | 14.8% | 155 |
| Noak Bridge Primary School144086 | Primary | Good | 23.7% | 207 |
| North Crescent Primary School145049 | Primary | Good | 36.9% | 216 |
| North East Essex Co-operative Academy143590 | Not applicable | Good | 61.0% | 105 |
| North Primary School and Nursery114709 | Primary | Good | 19.1% | 458 |
| Northlands Primary School and Nursery143125 | Primary | Good | 34.1% | 744 |
| Northwick Park Primary and Nursery Academy141571 | Primary | Good | 33.8% | 644 |
| Notley Green Primary School138901 | Primary | Good | 11.2% | 401 |
| Notley High School and Braintree Sixth Form137013 | Secondary | Requires Improvement | 18.0% | 1,210 |
| Oak View School145987 | Not applicable | Good | 45.6% | 138 |
| Oakfield Primary School131806 | Primary | Good | 8.2% | 391 |
| Oaklands Infant School146210 | Primary | Good | 7.1% | 168 |
| Oaklands School115419 | Not applicable | — | — | 264 |
| Oakwood Infant and Nursery School114722 | Primary | Good | 44.6% | 299 |