| 5 | John Coupland Hospital | Hospitals/Childcare/Caring Premises | West Lindsey | DN21 2TJ |
| 5 | Johnson's Traditional Fish and Chips | Takeaway/sandwich shop | West Lindsey | DN21 2DL |
| 5 | K & A's Shop and Sandwich Bar | Takeaway/sandwich shop | West Lindsey | DN21 5AN |
| 5 | K B Jones | Other catering premises | West Lindsey | DN21 |
| 5 | KFC | Restaurant/Cafe/Canteen | West Lindsey | DN21 2EZ |
| 5 | Kandy Hero | Retailers - other | West Lindsey | DN21 2DD |
| 5 | Katies Cakes and Bakes | Other catering premises | West Lindsey | DN21 |
| 4 | Kays Kitchens | Mobile caterer | West Lindsey | DN21 |
| 5 | Kids Hangout @ Parish | School/college/university | West Lindsey | DN21 2LN |
| 5 | Kingsway Clayton House Residential Care Home | Hospitals/Childcare/Caring Premises | West Lindsey | DN21 1LW |
| 5 | Kirton Academy by Aspens Service Ltd | School/college/university | North Lincolnshire | DN21 4NN |
| 4 | Kirton Chinese | Takeaway/sandwich shop | North Lincolnshire | DN21 4NA |
| 5 | Kirton In Lindsey Junior FC | Other catering premises | North Lincolnshire | DN21 4BX |
| 4 | Kirton Lindsey Fish Bar | Takeaway/sandwich shop | North Lincolnshire | DN21 4LX |
| 4 | Kirton Lindsey Primary Kitchen by Compass Group | School/college/university | North Lincolnshire | DN21 4EH |
| 5 | Kisimul Group Ltd, Gainsborough | Hospitals/Childcare/Caring Premises | West Lindsey | DN21 1HQ |
| Exempt | Knaith Village Hall | Other catering premises | West Lindsey | DN21 5ET |
| 5 | Kruger Meats | Retailers - other | West Lindsey | DN21 |
| 5 | LCC Gainsborough Market Arcade Childrens Centre and Family Hub | Hospitals/Childcare/Caring Premises | West Lindsey | DN21 2DY |
| 5 | LCC- Gainsborough North Marsh Road Childrens Centre | School/college/university | West Lindsey | DN21 2RR |
| 5 | LCC-Hemswell Cliff Childrens Centre | School/college/university | West Lindsey | DN21 5XS |
| 5 | Lakeview Cafe | Restaurant/Cafe/Canteen | North Lincolnshire | DN21 4JL |
| 5 | Larkrise Farm Shop | Retailers - other | North Lincolnshire | DN21 4EN |
| 4 | Laughton Croft Care Home | Hospitals/Childcare/Caring Premises | West Lindsey | DN21 3JF |
| Exempt | Lea Village Hall | Other catering premises | West Lindsey | DN21 5JA |
| 5 | Leilas Bakes | Retailers - other | West Lindsey | DN21 |
| 3 | Leons | Takeaway/sandwich shop | West Lindsey | DN21 2JX |
| 5 | Let there be cake | Other catering premises | West Lindsey | DN21 |
| 5 | Lidl | Retailers - supermarkets/hypermarkets | West Lindsey | DN21 2ER |
| 5 | Lincolnshire Co-op Heapham Road Food Store | Retailers - supermarkets/hypermarkets | West Lindsey | DN21 1SH |
| 5 | Lincolnshire Co-op Kirton in Lindsey Food Store | Retailers - supermarkets/hypermarkets | North Lincolnshire | DN21 4LU |
| 5 | Lincolnshire Co-op Morton Food Store | Retailers - supermarkets/hypermarkets | West Lindsey | DN21 3AA |
| 5 | Lincolnshire Co-op Scotter Food Store | Retailers - supermarkets/hypermarkets | West Lindsey | DN21 3RX |
| 5 | Lincolnshire Co-operative Ltd | Retailers - supermarkets/hypermarkets | West Lindsey | DN21 1EQ |
| 5 | Lincolnshire Otter | Pub/bar/nightclub | West Lindsey | DN21 1QT |
| 4 | Lindis | Mobile caterer | West Lindsey | DN21 5TX |
| 5 | Little Africa | Retailers - other | West Lindsey | DN21 2JH |
| 5 | Little Bee's Bakehouse | Other catering premises | West Lindsey | DN21 |
| 5 | Low Farm Apiary | Retailers - other | West Lindsey | DN21 |
| 3 | Lowfield House | Hospitals/Childcare/Caring Premises | North Lincolnshire | DN21 4EH |
| 5 | Manor House Bed and Breakfast | Hotel/bed & breakfast/guest house | North Lincolnshire | DN21 4JT |
| 5 | Marks & Spencer Simply Foods | Retailers - supermarkets/hypermarkets | West Lindsey | DN21 2NA |
| Exempt | Marton and Gate Burton Village Hall | Other catering premises | West Lindsey | DN21 5AR |
| Exempt | Masonic Hall | Pub/bar/nightclub | West Lindsey | DN21 2RR |
| 5 | McDonalds | Restaurant/Cafe/Canteen | West Lindsey | DN21 2EG |
| 4 | Mei's Kitchen | Takeaway/sandwich shop | West Lindsey | DN21 1JW |
| Exempt | Mercer's Wood Academy | School/college/university | West Lindsey | DN21 2PD |
| 5 | Merkur Slots | Retailers - other | West Lindsey | DN21 2DT |
| 5 | Meynell Kindergarten | Hospitals/Childcare/Caring Premises | West Lindsey | DN21 3PS |
| 5 | Middies | Takeaway/sandwich shop | West Lindsey | DN21 1JN |