| SL6256 | COOPER Glynis | Handsworth & Hallam Theatre Company | 22/09/2009 | 22/09/2010 | indefinite |
| SL6427 | COOPER Catherine | St John Fisher PTFA | 19/06/2023 | 24/11/2005 | indefinite |
| SL6409 | COOPER Carole Anne | Norton Oakes Cricket Club | 27/09/2013 | 26/09/2013 | indefinite |
| SL4163 | COOMER J A | Hallam Community Hall | 29/09/2026 | 01/01/2011 | indefinite |
| SL6357 | COOK Gemma | Stannington Infants School Parent Fundraising Association | 11/03/2014 | 11/03/2014 | indefinite |
| SL6300 | CONNOR Fiona | Bankwood Primary School | 18/11/2025 | 18/11/2011 | indefinite |
| SL6576 | CONDUIT Hannah | Friends Meersbrook Bank School | 11/10/2024 | 28/06/2023 | indefinite |
| SL5900 | COLLINS Janet | City of Sheffield Gymnastics Club | 01/01/2008 | 01/01/2008 | indefinite |
| SL4193 | COLE S A | Worrall Community Association | 10/11/2010 | 01/01/2011 | indefinite |
| SL3634 | COLE J J | Beck Nursery & Primary School | 02/02/2012 | 01/10/2011 | indefinite |