There were 27 places in the hundred of Horncastle in Domesday Book.
| Name | Households |
|---|---|
| [Tattershall] Thorpe | 103 |
| Scrivelsby | 89 |
| [West] Ashby | 73 |
| Thimbleby | 67 |
| [High and Low] Toynton | 64 |
| Baumber | 63 |
| Waddingworth | 60 |
| Edlington | 59 |
| Wispington | 49 |
| Langton | 48 |
| Horncastle | 41 |
| Coningsby | 33 |
| Mareham [-le-Fen] | 33 |
| Torp | 33 |
| [Wood] Enderby | 22 |
| Kirkby [-on-Bain] | 19 |
| Thornton | 19 |
| Moorby | 18 |
| Tumby | 17 |
| [Little] Sturton | 16 |
| Haltham | 15 |
| Wilksby | 14 |
| Roughton | 11.5 |
| Martin | 10 |
| Fulsby | 4 |
| Mareham [-on-the-Hill] | 1 |
| Tattershall | 0 |