| Rank | Built up area subdivision | Population (2001 census) | Population (2011 census)[1] [2] [3] | District | Outlying areas detail |
|---|
| 1 | Lincoln | 104,221 | 100,160 | Lincoln | North Hykeham included in 2001. Bracebridge Heath, Washingborough counted separately. Burton-by-Lincoln, Canwick, Harmston, North Greetwell, Nettleham, Riseholme, Skellingthorpe excluded |
| 2 | Grimsby | 87,574 | 88,243 | North East Lincolnshire | Cleethorpes, New Waltham, Waltham counted separately. Bradley, Healing, Laceby excluded |
| 3 | Scunthorpe | 72,660 | 79,977 | North Lincolnshire | Berkeley, Bottesford, Yaddlethorpe included. Flixborough, Raventhorpe excluded |
| 4 | Grantham | 34,592 | 41,998 | South Kesteven | Barrowby, Belton, Great Gonerby, Harlaxton, Spittlegate excluded |
| 5 | Boston | 35,124 | 41,340 | Boston | Skirbeck, Wyberton included. Kirton counted separately. Fishtoft, Frampton, Freiston, Haltoft End, Hubberts Bridge, Kirton End, Kirton Holme excluded |
| 6 | Cleethorpes | 31,853 | 39,505 | North East Lincolnshire | Humberston included |
| 7 | Spalding | 22,081 | 31,588 | South Holland | Crossgate, Pinchbeck, Pode Hole included. Cowbit, Low Fulney, Surfleet, Weston, Weston Hills excluded |
| 8 | Skegness | 20,694 | 24,876 | East Lindsey | Chapel St Leonards, Ingoldmells, Seacroft, Winthorpe included. Addlethorpe, Hogsthorpe excluded |
| 9 | Gainsborough | 19,110 | 20,842 | West Lindsey | Lea, Morton included. Knaith Park excluded |
| 10 | Stamford | 19,525 | 19,701 | South Kesteven | Northfields, Newtown/Toll Bar included. Borderville, Great Casterton (Rutland), Newstead, Tinwell, Wothorpe excluded |
| 11 | Sleaford | 15,219 | 17,359 | | Holdingham, Quarrington included |
| 12 | Louth | 15,930 | 16,419 | | Keddington, Stewton excluded |
| 13 | North Hykeham | | 14,719 | North Kesteven | Included within Lincoln's figure in 2001. South Hykeham, Thorpe-on-the-Hill excluded |
| 14 | Bourne | 11,482 | 13,961 | | Eastgate, Elsea Park, Westfield included. Cawthorpe, Dyke, Thurlby excluded |
| 15 | Market Deeping | 13,588 | 13,574 | | Frognall included. Langtoft excluded |
| 16 | Mablethorpe | 11,780 | 12,531 | | Sutton-on-Sea, Trusthorpe included. Ossington excluded |
| 17 | Barton-upon-Humber | 9,334 | 11,066 | | Barton Waterside included |
| 18 | Immingham | 11,090 | 10,750 | | East Halton, Habrough, Stallingborough excluded |
| 19 | Holbeach | 7,247 | 7,914 | | Fleet, Fleet Hargate, Guy's Wells, Holbeach Clough, Saracen's Head, Whaplode excluded |
| 20 | Horncastle | 6,090 | 6,815 | | High Toynton, Langton, Mareham, Thornton, Thimbleby excluded |
| 21 | Brigg | 5,860 | 6,787 | | Scawby, Wrawby excluded |
| 22 | Washingborough | 6,274 | 6,463 | North Kesteven | Heighington included |
| 23 | Waltham | 6,420 | 6,057 | North East Lincolnshire | New Waltham counted separately. Barnoldby-le-Beck, Brigsley excluded |
| 24 | Bracebridge Heath | 4,530 | 5,656 | North Kesteven | |
| 25 | Ruskington | 4,950 | 5,637 | North Kesteven | Dorrington excluded |
| 26 | New Waltham | 4,958 | 5,613 | North East Lincolnshire | Waltham counted separately, Holton le Clay excluded |
| 27 | Long Sutton | 4,532 | 5,161 | South Holland | Chapelgate, Gedney, Lutton, Sutton Bridge excluded |
| 28 | Coningsby | 4,292 | 5,021 | East Lindsey | |
| 29 | Winterton | 4,729 | 4,899 | North Lincolnshire | |
| 30 | Kirton | 3,469 | 4,821 | Boston | |
| 31 | Market Rasen | 3,491 | 4,773 | West Lindsey | |
| 32 | Broughton | 4,677 | 4,677 | North Lincolnshire | | |
