| 1 | Mistley Towers, North West TowerCO11 1ET | Grade I |
| 2 | Mistley Towers, South East TowerCO11 1ET | Grade I |
| 3 | 10 and 12, South StreetCO11 1BB | Grade II |
| 4 | 1-12, the GreenCO11 1EU | Grade II |
| 5 | 17, Regent StreetCO11 1BJ | Grade II |
| 6 | 17, South StreetCO11 1BG | Grade II |
| 7 | 1, the WallsCO11 1AS | Grade II |
| 8 | 23,25 and 27, South StreetCO11 1BG | Grade II |
| 9 | 2-8, York StreetCO11 1DB | Grade II |
| 10 | 29, South StreetCO11 1BG | Grade II |
| 11 | 2 and 3, English TerraceCO11 1AP | Grade II |
| 12 | 30,32 and 34, Brook StreetCO11 1DR | Grade II |
| 13 | 31, South StreetCO11 1BG | Grade II |
| 14 | 33, South StreetCO11 1BG | Grade II |
| 15 | 36 and 38, Brook StreetCO11 1DR | Grade II |
| 16 | 37, South StreetCO11 1DB | Grade II |
| 17 | 3 and 4, the WallsCO11 1AS | Grade II |
| 18 | 40, Brook StreetCO11 1DR | Grade II |
| 19 | 45, 47 and 51, Brook StreetCO11 1DN | Grade II |
| 20 | 46, High StreetCO11 1AH | Grade II |
| 21 | 48, High StreetCO11 1AH | Grade II |
| 22 | 49, High StreetCO11 1AH | Grade II |
| 23 | 52, South StreetCO11 1DN | Grade II |
| 24 | 57, High StreetCO11 1AU | Grade II |
| 25 | 59-65, High StreetCO11 1AN | Grade II |
| 26 | 59, South StreetCO11 1DT | Grade II |
| 27 | 5, High StreetCO11 1QF | Grade II |
| 28 | 65, 67 and 69, South StreetCO11 1DT | Grade II |
| 29 | 69, High StreetCO11 1AS | Grade II |
| 30 | 71, 73 and 75, South StreetCO11 1DT | Grade II |
| 31 | 7, Brook StreetCO11 1DJ | Grade II |
| 32 | Abbey National Building Society Cyril Cox, SolicitorsCO11 1AQ | Grade II |
| 33 | Acacia House with Left Return to the GreenCO11 1HA | Grade II |
| 34 | Aldis Fashions Foster Prior, Estate Agents Le FleurCO11 1AD | Grade II |
| 35 | Brantham House and Railings Attached to Front StepsCO11 1AN | Grade II |
| 36 | Calburne Shop Occupied by J and Rw SteelCO11 1HD | Grade II |
| 37 | Calver and Arnold, Hardware National Travel WorldCO11 1AG | Grade II |
| 38 | Church HouseCO11 1AJ | Grade II |
| 39 | Church of St Mary and St MichaelCO11 1ER | Grade II |
| 40 | Cooperative Pharmacy Dry Cleaning Centre Krystyna Numbers 38, 40 and 42 Including Church Wall to Left (East)CO11 1AJ | Grade II |
| 41 | Corner Block, North Return to Stour Street Harwich Radio and Cycle Supplies the Dragon House Chinese RestaurantCO11 1BG | Grade II |
| 42 | County LibraryCO11 1AD | Grade II |
| 43 | Cumberland HouseCO11 1DN | Grade II |
| 44 | Dairy House, Dairy Cottage and Attached StablesCO11 2NL | Grade II |
| 45 | Dolphin HouseCO11 1HD | Grade II |
| 46 | Dorset HouseCO11 2AQ | Grade II |
| 47 | East Lodge Including Outbuilding at RearCO11 1EU | Grade II |
| 48 | Empty Shop to East of NutcrackersCO11 1HD | Grade II |
| 49 | English HouseCO11 1AP | Grade II |
| 50 | Entrance Gate and Front Railings to Dorset HouseCO11 2AP | Grade II |