| Name | Country | Feature class | Latitude | Longitude | |
|---|---|---|---|---|---|
1801  | Madeley  Madeley | United Kingdom, England Staffordshire > Newcastle-under-Lyme District > Madeley | populated place population 3,893 | N 53° 0′ 0'' | W 2° 20′ 0'' |
| 1802 | Macmerry | United Kingdom, Scotland East Lothian | populated place population 1,350 | N 55° 56′ 25'' | W 2° 54′ 18'' |
| 1803 | Machynlleth Machynlleth,Macynletas,Makhinlet,Makhunlet,Mačynletas,ma han lai si,macyanllent,makinleseu,markarett... | United Kingdom, Wales Powys > Machynlleth | populated place population 2,235 | N 52° 35′ 22'' | W 3° 51′ 11'' |
| 1804 | Machen Machen | United Kingdom, Wales Caerphilly > Bedwas, Trethomas and Machen | populated place population 2,362 | N 51° 35′ 45'' | W 3° 8′ 30'' |
| 1805 | Macduff An Dun,An Dùn,An Dún,Dun MhicDhuibh,Dùn MhicDhuibh | United Kingdom, Scotland Aberdeenshire | populated place population 4,030 | N 57° 40′ 12'' | W 2° 29′ 48'' |
| 1806 | Lynton Linton,Lynton | United Kingdom, England Devon > North Devon District > Lynton and Lynmouth | populated place population 1,157 | N 51° 13′ 46'' | W 3° 50′ 28'' |
| 1807 | Lyneham LYE,Linkhem,Lyneham,Линхем | United Kingdom, England Wiltshire > Lyneham and Bradenstoke | populated place population 5,437 | N 51° 31′ 0'' | W 1° 58′ 0'' |
| 1808 | Lyndhurst | United Kingdom, England Hampshire > New Forest > Lyndhurst | populated place population 2,347 | N 50° 52′ 21'' | W 1° 34′ 35'' |
| 1809 | Lympne Limpn,Лимпн | United Kingdom, England Kent > Shepway District > Lympne | populated place population 1,704 | N 51° 4′ 39'' | E 1° 1′ 41'' |
| 1810 | Lymm Lim,lymm,Лим,ليمم | United Kingdom, England Warrington > Lymm | seat of a third-order administrative division population 11,608 | N 53° 22′ 51'' | W 2° 28′ 39'' |
| 1811 | Lydd LYX,Lydd,lyd knt,لید، کنت | United Kingdom, England Kent > Shepway District > Lydd | populated place population 3,889 | N 50° 57′ 4'' | E 0° 54′ 23'' |
| 1812 | Lydbrook Lydbrook | United Kingdom, England Gloucestershire > Forest of Dean > Lydbrook | populated place population 1,894 | N 51° 50′ 15'' | W 2° 34′ 41'' |
| 1813 | Lutterworth Lutterworth,latrwwrth,لاتروورث | United Kingdom, England Leicestershire > Harborough District > Lutterworth | populated place population 9,907 | N 52° 27′ 22'' | W 1° 12′ 7'' |
| 1814 | Lundin Links Lundin Links | United Kingdom, Scotland Fife | populated place population 2,124 | N 56° 12′ 50'' | W 2° 57′ 6'' |
| 1815 | Luncarty | United Kingdom, Scotland Perth and Kinross | populated place population 1,680 | N 56° 27′ 11'' | W 3° 28′ 12'' |
| 1816 | Lugwardine Lugwardine | United Kingdom, England Herefordshire > Lugwardine | populated place population 1,913 | N 52° 3′ 57'' | W 2° 39′ 28'' |
| 1817 | Luddenden Foot | United Kingdom, England Calderdale | populated place population 2,190 | N 53° 43′ 7'' | W 1° 56′ 45'' |
| 1818 | Low Etherley | United Kingdom, England Durham > Etherley | populated place population 1,929 | N 54° 39′ 12'' | W 1° 44′ 35'' |
| 1819 | Lower Kingswood | United Kingdom, England Surrey > Reigate and Banstead District | populated place population 1,760 | N 51° 16′ 10'' | W 0° 12′ 44'' |
| 1820 | Lower Halstow | United Kingdom, England Kent > Swale District > Lower Halstow | populated place population 1,180 | N 51° 22′ 26'' | E 0° 40′ 5'' |
| 1821 | Lowdham | United Kingdom, England Nottinghamshire > Newark and Sherwood District > Lowdham | populated place population 2,234 | N 53° 0′ 43'' | W 1° 0′ 17'' |
| 1822 | Low Bradley Bradley,Low Bradley | United Kingdom, England North Yorkshire > Craven District > Bradleys Both | populated place population 1,244 | N 53° 55′ 55'' | W 1° 59′ 47'' |
| 1823 | Loudwater Loudwater | United Kingdom, England Buckinghamshire > Wycombe > Chepping Wycombe | populated place population 4,170 | N 51° 36′ 38'' | W 0° 42′ 5'' |
| 1824 | Lostwithiel Lostwithiel,Lostwydhyel,lastwytyl,lwstwyzyl,لاستویتیل,لوستويزيل | United Kingdom, England Cornwall > Lostwithiel | populated place population 2,659 | N 50° 24′ 28'' | W 4° 40′ 12'' |
| 1825 | Longwick Longwick,ronguuikku,ロングウィック | United Kingdom, England Buckinghamshire > Wycombe > Longwick-cum-Ilmer | populated place population 1,143 | N 51° 44′ 9'' | W 0° 51′ 24'' |
| 1826 | Long Whatton | United Kingdom, England Leicestershire > North West Leicestershire > Long Whatton and Diseworth | populated place population 1,124 | N 52° 48′ 20'' | W 1° 17′ 6'' |
| 1827 | Longtown Longtown | United Kingdom, England Cumbria > Cumberland > Arthuret | populated place population 3,000 | N 55° 0′ 33'' | W 2° 58′ 2'' |
| 1828 | Longniddry Longniddry | United Kingdom, Scotland East Lothian | populated place population 2,430 | N 55° 58′ 31'' | W 2° 53′ 45'' |
| 1829 | Long Itchington | United Kingdom, England Warwickshire > Stratford-on-Avon District > Long Itchington | populated place population 1,683 | N 52° 17′ 2'' | W 1° 23′ 32'' |
| 1830 | Longforgan | United Kingdom, Scotland Perth and Kinross | populated place population 1,210 | N 56° 27′ 26'' | W 3° 6′ 51'' |
| 1831 | Long Ditton | United Kingdom, England Surrey > Elmbridge District | populated place population 6,343 | N 51° 23′ 3'' | W 0° 19′ 13'' |
| 1832 | Long Clawson Long Clawson | United Kingdom, England Leicestershire > Melton District > Clawson, Hose and Harby | populated place population 1,066 | N 52° 50′ 14'' | W 0° 55′ 43'' |
| 1833 | Long Ashton | United Kingdom, England North Somerset > Long Ashton | populated place population 5,254 | N 51° 25′ 47'' | W 2° 39′ 39'' |
| 1834 | Londonderry County Borough | United Kingdom, Northern Ireland Derry City and Strabane | section of populated place population 87,153 | N 54° 59′ 50'' | W 7° 18′ 33'' |
| 1835 | London Colney London Colney,London Olney | United Kingdom, England Hertfordshire > City and District of St. Albans > London Colney | populated place population 9,800 | N 51° 43′ 28'' | W 0° 17′ 47'' |
| 1836 | Loftus | United Kingdom, England Redcar and Cleveland > Loftus | populated place population 4,824 | N 54° 33′ 19'' | W 0° 53′ 40'' |
| 1837 | Loddon Loddon,lwdwn nwrfk,لودون، نورفک | United Kingdom, England Norfolk > South Norfolk District > Loddon | populated place population 3,552 | N 52° 31′ 57'' | E 1° 28′ 54'' |
| 1838 | Lochwinnoch Loch Eanach,Loch Uinneach,Lochwinnoch | United Kingdom, Scotland Renfrewshire | populated place population 2,900 | N 55° 47′ 42'' | W 4° 37′ 49'' |
| 1839 | Lochmaben Loch Mhabain,Lochmaben | United Kingdom, Scotland Dumfries and Galloway | populated place population 2,100 | N 55° 7′ 48'' | W 3° 26′ 34'' |
| 1840 | Lochgilphead Ceann Loch Gilb,Lokhgilpkhed,Loxqilpxed,lwkgylphd,lwkgylphyd,Лохгилпхед,Лохгілпхед,לוכגילפהד,لوکگیلپ... | United Kingdom, Scotland Argyll and Bute | seat of a second-order administrative division population 2,390 | N 56° 2′ 16'' | W 5° 25′ 55'' |
| 1841 | Lochgelly Lochgelly | United Kingdom, Scotland Fife | populated place population 6,586 | N 56° 7′ 41'' | W 3° 18′ 34'' |
| 1842 | Locharbriggs Locharbriggs | United Kingdom, Scotland Dumfries and Galloway | populated place population 5,960 | N 55° 6′ 12'' | W 3° 35′ 3'' |
| 1843 | Loanhead Loanhead | United Kingdom, Scotland Midlothian | populated place population 6,350 | N 55° 52′ 46'' | W 3° 9′ 31'' |
| 1844 | Llwynypia Llwyn-y-pia,Llwynpia,Llwynypia | United Kingdom, Wales Rhondda Cynon Taf > Llwyn-y-Pia | populated place population 2,253 | N 51° 38′ 0'' | W 3° 27′ 0'' |
| 1845 | Llanymynech Llanymynech | United Kingdom, Wales Powys > Carreghofa | populated place population 887 | N 52° 46′ 51'' | W 3° 5′ 19'' |
| 1846 | Llantwit Fardre Lantuit Fardru,Latvit Fardras,Llanilltud Faerdref,Llantwit Fardre,Llantwitt-fardre,Llantwitvairdre,L... | United Kingdom, Wales Rhondda Cynon Taf > Llantwit Fardre | populated place population 3,992 | N 51° 33′ 16'' | W 3° 19′ 56'' |
| 1847 | Llantrisant Lantrisant,Llantrisant,Лантрисант | United Kingdom, Wales Rhondda Cynon Taf > Llantrisant | seat of a third-order administrative division population 14,422 | N 51° 32′ 25'' | W 3° 22′ 26'' |
| 1848 | Llansantffraid-ym-Mechain Llansanffraid,Llansantffraid,Llansantffraid-ym-Mechain | United Kingdom, Wales Powys > Llansantffraid | populated place population 1 | N 52° 46′ 27'' | W 3° 9′ 30'' |
| 1849 | Llanrwst Lanrust,Llanrust,Llanrwst,Llanwrst,Ланруст,Лланруст | United Kingdom, Wales Conwy > Llanrwst | populated place population 3,323 | N 53° 8′ 24'' | W 3° 47′ 42'' |
| 1850 | Llanrug | United Kingdom, Wales Gwynedd > Llanrug | populated place population 1,916 | N 53° 8′ 52'' | W 4° 11′ 45'' |
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