There were 20 places in the hundred of Threo in Domesday Book.
| Name | Tax paid | Households |
|---|---|---|
| Aisby | 3 | 11 |
| Barkston | 12 | 54 |
| Belton | 7 | 26 |
| Boothby [Pagnell] | 5.7 | 19.5 |
| Braceby | 6.5 | 18 |
| Dunsthorpe | 2 | 14 |
| [Great and Little] Humby | 4 | 17 |
| Harrowby | 5.5 | 18 |
| Heydour | 4 | 28 |
| Honington | 12 | 44 |
| Londonthorpe | 8.4 | 36 |
| Oasby | 5 | 21 |
| [Old] Somerby | 6.7 | 16.5 |
| Ropsley | 8 | 31 |
| Sapperton | 5.5 | 17 |
| Syston | 12 | 38 |
| Towthorpe | 3.5 | 16 |
| Welby | 12 | 57 |
| Westhorpe | 2 | 10 |
| Wilsford | 12 | 31 |