| Saffron Walden |
Full name (in Craig 2,3,4) Essex, Saffron Walden |
| Salford |
Seat of same name existed 1832-1885. |
| Salford |
Seat of same name reformed 1997. |
| Salford and Eccles |
Formed from parts of the former Salford and Eccles constituency after the number of seats in Greater Manchester was reduced. |
| Salford East |
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| Salford North |
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| Salford South |
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| Salford West |
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| Salisbury |
Full name (in Craig 3,4) Wiltshire, Salisbury |
| Sandwich |
Disfranchised for corruption. Seat vacant between August 1880 and 1885 due to corrupt practices. Constituency abolished and absorbed into Eastern Kent. |
| Scarborough |
Constituency of same name also existed 1832-1918. |
| Scarborough |
Constituency of same name also existed 1974¹-1997. |
| Scarborough and Whitby |
Full name (in Craig 3,4) Yorkshire (North Riding), Scarborough and Whitby. Constituency of same name reformed 1997. |
| Scarborough and Whitby |
Constituency of same name also existed 1918-1974¹. |
| Scunthorpe |
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| Seaham |
Full name (in Craig 3) Durham, Seaham |
| Sedgefield |
Full name (in Craig 3,4) Durham, Sedgefield |
| Sefton Central |
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| Selby |
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| Selby and Ainsty |
Successor to Selby |