| Name | Parish (Pre-1933) | OS Grid Reference | OS 1" Sheet | OS County Sheet | OS National Grid Sheet | Census | Directory | Note |
| Maesteg | Worth | TQ 2989 3776 | | | TQ 2937 (1960) | | | |
| Mafeking Cottages, 72-74 Hazelwick Road | Worth | | | | | | | Dated 1900 |
| Magpie Wood | Worth | TQ 274 381 | | Sussex III.8 (1910, 1937, 1946) | | | | |
| Magtra, London Road | Crawley | TQ 2698 3801 | | | TQ 2638SE (1960) | | 1951 | Magfra 1951 |
| Maid of Sussex (PH), Gales Drive | Worth | TQ 2805 3694 | | | TQ 2836 (1961)TQ 2836NW (1958) | | | |
| Maidebower - Brick & Tile Works | Worth | TQ 293 349 | | Sussex IV.13 (1897, 1910) | | | | |
| Maidenbower | Worth | TQ 292 358 | 1813-1820 | | | | | |
| Maidenbower Farm | Worth | TQ 291 357 | | Sussex IV.13 (1897, 1910) | | | | |
| Maidenbower Lane | Worth | TQ 290 357 | | Sussex IV.13 (1897, 1910) | | | | |
| Main Oaks, Rusper Road | Ifield | TQ 2479 3680 | | | TQ 2436 (1966) | | | |
| Major's Hill | Worth | TQ 324 359 | | Sussex IV.14 (1910) | | | | |
| Maloja, London Road | Crawley | TQ 2696 3785 | | | TQ 2637NE (1959) | | 1951 | |
| Malthouse Farm | Worth | TQ 2721 3608 | | Sussex III.12 (1874, 1910, 1932, 1946) | TQ 2736SW (1959) | | | |
| Malthouse Lane | Ifield | TQ 271 363 | | Sussex III.12 (1874, 1910, 1932) | | | | |
| Malthouse Road | Ifield | TQ 269 361 | | Sussex III.12,16 (1910, 1932, 1946) | | | | |
| Manor Farm Cottages, London Road | Crawley | TQ 3702 3848 | | | TQ 2738SW (1959) | | 1951 | |
| Manor House | Burstow | TQ 312 413 | | Surrey XLII.5 (1912) | | | | See Old Court |
| Manor House | Crawley | TQ 2707 3838 | | Sussex III.8 (1897, 1910, 1937, 1946) | TQ 2738SW (1959) | CI: 229 (1901) | 1899, 1951 | |
| Manor House Cottages | Crawley | TQ 2699 3833 | | | TQ 2638SE (1960) | CI: 224-225 (1901) | 1951 | |
| Manor House Farm | Ifield | TQ 252 390 | | Sussex III.7 (1910) | | | | See Parkhouse Farm |
| Man's Brook | Charlwood | TQ 245 406 | | Surrey XLI.6,7 (1896/97, 1913) | | | | |
| Maple Cottages, London Road | Crawley | TQ 2704 3899 | | | TQ 2738NW (1958) | | 1951 | No 3 see also Boundary Cottage |
| Marden, Rusper Road | Ifield | TQ 2483 3696 | | | TQ 2436 (1966) | | | |
| Marilen, London Road | Crawley | TQ 2699 3805 | | | TQ 2638SE (1960) | | 1951 | |
| Marion House, Lowfield Heath | Charlwood | TQ 2716 3995 | | | TQ 2739 (1960) | | 1951 | |
| Market Place, Ifield Road | Ifield | TQ 2650 3663 | | | | | | |
| Marsh Wood | Worth | TQ 301 383 | | Sussex IV.5 (1897, 1910, 1932) | | | | |
| Marshland Cottages | Newdigate | TQ 202 394 | | Surrey XLI.9 (1915) | | | | |
| Marshland Farm | Newdigate | TQ 200 398 | | Surrey XLI.9 (1915) | | | | |
| Martins Farm | Rusper | TQ 2207 3799 | | | TQ 2237 (1974) | | | |
| Martyrs Farm | Crawley | TQ 268 383 | 1813-1819 | Sussex III.8 (1897, 1910) | | | | See Matyrs |
| Martyrs, London Road | Ifield | TQ 2687 3835 | | Sussex III.8 (1937, 1946) | TQ 2638SE (1960) | | 1951 | See Martyrs Farm |
| Matlock House, 57 Brighton Road | Ifield | TQ3580 2664 | | | | IS: 1 (1901) | 1899 | |
| Mawgan, London Road | Crawley | TQ 2696 3782? | | | | | 1951 | Became Lynton? |
| Mayfield, 50 Horsham Road | Ifield | TQ 2631 3640 | | | | | 1951 | |
| Mayfields | Charlwood | TQ 258 397 | | Surrey XLI.11 (1913) | | | | See Taskers Farm |
| Meadow Croft | Horley | TQ 291 418 | | Surrey XLI.8 (1896, 1913) | | | | |
| Meadow View, London Road | Crawley | TQ 2702 3822 | | | TQ 2738SW (1959) | | 1951 | |
| Meadowcroft, Grattons Drive | Worth | TQ 2921 3795 | | | TQ 2937 (1960) | | | |
| Meadowlands, Rusper Road | Ifield | TQ 2429 3672 | | | TQ 2436 (1966) | | | |
| Meadvale, Tushmore Lane | Crawley | TQ 2719 3782 | | | TQ 2737NW (1959) | | | |
| Medway, River | Worth | TQ 349 356 | | Sussex IV.15 (1874, 1897) | | | | |
| Meeting House Cottage, Langley Lane | Ifield | TQ 2524 3791 | | | | | | Grade II* Listed |
| Meldon, Rusper Road | Ifield | TQ 2481 3689 | | | TQ 2436 (1966) | | | |
| Mellow Wood, Worth Park Avenue | Worth | TQ 2932 3734 | | | TQ 2937 (1960) | | | |
| Michaelmas Cottage | Ifield | TQ 2515 3800 | | | | | | Grade II Listed |
| Middle Covert | Lower Beeding | TQ 242 341 | | Sussex XIV.3 (1897, 1911) | TQ 2434 (1966) | | | |
| Middle Wood | Worth | TQ 2979 3795 | | | TQ 2937 (1960) | | | |
| Midway, Green Lane | Worth | TQ 2739 3767 | | | TQ 2737NW (1959) | | | |
| Milestones, London Road | Crawley | TQ 2698 3798 | | | TQ 2637NE (1959) | | 1951 | |
| Mill Bridge | Charlwood/Horley | TQ 269 433 | | Surrey XLI.3 (1896, 1913) | | | | |
| Mill Cottage | Ifield | TQ 2451 3647 | | | TQ 2436 (1966) | CI: 98-99 (1901) | | |
| Mill Cottage | Worth | TQ 3157 3778 | | | TQ 3137 (1961) | | | |
| Mill Farm | Lower Beeding | TQ 239 357 | | Sussex III.15 (1911, 1932) | | | | |
| Mill House | Worth | TQ 3163 3783 | | | TQ 3137 (1961) | | | |
| Mill House, Rusper Road | Ifield | TQ 2438 3642 | | | TQ 2436 (1966) | | | Grade II Listed |
| Mill Lane | Worth | TQ 291 376 | | Sussex IV.9 (1874, 1897, 1911) | | | | |
| Mill Pond | Ifield | TQ 244 360 | | | | | | |
| Mill Pond [Rowfant] | Worth | TQ 317 376 | | | TQ 3137 (1961) | | | |
| Mill Race | Ifield | TQ 245 371 | | Sussex III.11 (1910) | | | | See Mill Stream |
| Mill Race | Worth | | | Sussex IV.5 (1897, 1910) | | | | See Mill Stream |
| Mill Road | Worth | TQ 285 371 | | Sussex IV.9 (1911) | | | | |
| Mill Stream | Ifield | TQ 245 371 | | Sussex III.11 (1932) | | | | See Mill Race |
| Mill Stream | Worth | TQ 288 380 | | Sussex IV.5 (1932) | | | | See Mill Race |
| Mill Studio | Worth | TQ 3158 3775 | | | TQ 3137 (1961) | | | |
| Mill, The | Worth | TQ 3157 3775 | | | TQ 3137 (1961) | | | |
| Milton Mount - Nursery | Worth | TQ 294 379 | | Sussex IV.5 (1932) | | | | |
| Milton Mount - Nursery | Worth | TQ 296 378 | | Sussex IV.5 (1932) | | | | |
| Milton Mount College | Worth | TQ 296 380 | | Sussex IV.5 (1932) | | | | See Worth Park |
| Miswell Wood | Worth | TQ 336 360 | | Sussex IV.15 (1897) | | | | |
| Mitchells Farm | Worth | TQ 276 376 | | Sussex III.12 (1932, 1946) | | | | |
| Moat House, The, Balcombe Road | Worth | TQ 2965 3743 | | | TQ 2937 (1960) | | | |
| Mole, River | Charlwood/Horley/Ifield | TQ 260 400 | | Surrey XLI.3,4,7,8,11,12 (1898, 1913) | | | | |
| Monks Farm | Balcombe | TQ 311 331 | | | | | | |
| Monkshood, Old Horsham Road | Ifield | TQ 2593 3603 | | | TQ 2536SE (1960) | | | |
| Montallan / Montalan Nursing Home, 39 Goffs Park Road | Ifield | TQ 2627 3593 | | | | IS: 188 (1901) | 1951 | Became Goff's Park Nursing Home |
| Montana, London Road | Crawley | TQ 2699 3801 | | | TQ 2638SE (1960) | | 1951 | |
| Montefiore Institute, Hazelwick Road | Worth | TQ 2863 3709 | | | TQ 2837 (1960) | | | |
| Montreux, Gossops Green Lane | Ifield | TQ 2582 3674 | | | TQ 2536 (1966)TQ 2536NE (1960) | | 1951 | |
| Montrose, Scallows Road | Worth | TQ 2821 3716 | | | TQ 2837 (1960) | | | |
| Morley's Yard | Crawley | | | | | CI: 166-167 (1901) | | |
| Morning Dawn, London Road | Ifield | TQ 2699 3843 | | | TQ 2638SE (1960) | | 1951 | |
| Moulin Huet, Crawley Lane | Worth | TQ 2938 3703 | | | TQ 2937 (1960) | | | |
| Mount Cottages, Ifield Wood | Ifield | TQ 2314 3743 | | | TQ 2337 (1974) | | | |
| Mount Pleasant | Charlwood | TQ 241 414 | | Surrey XLI.6 (1897, 1913) | | | | |
| Mount Pleasant | Worth | TQ 285 330 | | Sussex XV.1 (1910) | | | | |
| Mount, The | Ifield | TQ 2263 3800 | | | TQ 2237 (1974) | | | |
| Mountnoddy Wood | Charlwood | TQ 225 402 | | Surrey XLI.6 (1897, 1913) | | | | |
| Munks Farm | Balcombe | TQ 311 331 | 1813-1820 | | | | | |
| Munzil, Whitehall Drive | Ifield | TQ 2418 3657 | | | TQ 2436 (1966) | | | |
| Murgins Wood | Burstow | TQ 320 401 | | Surrey XLII.9 (1912) | | | | |
| Myrtle Cottage, Lowfield Heath | Charlwood | TQ 2640 3978 | | | TQ 2639 (1960) | | | |
| Myrtle Lodge | Charlwood | TQ 263 397 | | Surrey XLI.11 (1897, 1913) | | | | |