| Location | Locality | Coordinates
(links to map & photo sources) | OS grid
reference |
| Isabella Pit | Northumberland | 55°07′N 1°32′W / 55.11°N 01.53°W / 55.11; -01.53 | NZ3080 |
| Isallt Bach | Isle of Anglesey | 53°16′N 4°37′W / 53.27°N 04.62°W / 53.27; -04.62 | SH2579 |
| Isauld | Highland | 58°34′N 3°46′W / 58.56°N 03.77°W / 58.56; -03.77 | NC9765 |
| Isay | Highland | 57°31′N 6°38′W / 57.51°N 06.64°W / 57.51; -06.64 | NG219565 |
| Isbister (Whalsay) | Shetland Islands | 60°20′N 0°58′W / 60.34°N 00.96°W / 60.34; -00.96 | HU5763 |
| Isbister (near North Roe, Northmavine) | Shetland Islands | 60°35′N 1°19′W / 60.59°N 01.32°W / 60.59; -01.32 | HU3790 |
| Isbister (East Mainland) | Orkney Islands | 59°02′N 3°04′W / 59.04°N 03.06°W / 59.04; -03.06 | HY3918 |
| Isbister (West Mainland) | Orkney Islands | 59°05′N 3°17′W / 59.08°N 03.29°W / 59.08; -03.29 | HY2623 |
| Isbister Holm | Shetland Islands | 60°21′N 0°54′W / 60.35°N 00.90°W / 60.35; -00.90 | HU603642 |
| Isel | Cumbria | 54°41′N 3°19′W / 54.68°N 03.32°W / 54.68; -03.32 | NY1533 |
| Isfield | East Sussex | 50°56′N 0°04′E / 50.93°N 00.06°E / 50.93; 00.06 | TQ4517 |
| Isham | Northamptonshire | 52°20′N 0°42′W / 52.34°N 00.70°W / 52.34; -00.70 | SP8873 |
| Isington | Hampshire | 51°10′N 0°53′W / 51.17°N 00.89°W / 51.17; -00.89 | SU7742 |
| Island Carr | North Lincolnshire | 53°32′N 0°30′W / 53.54°N 00.50°W / 53.54; -00.50 | SE9906 |
| Island Davaar | Argyll and Bute | 55°25′N 5°32′W / 55.42°N 05.54°W / 55.42; -05.54 | NR759201 |
| Island Macaskin | Argyll and Bute | 56°08′N 5°34′W / 56.13°N 05.56°W / 56.13; -05.56 | NR789992 |
| Island of Rona | Highland | 57°32′N 5°58′W / 57.54°N 05.97°W / 57.54; -05.97 | NG624575 |
| Island of Stroma | Highland | 58°41′N 3°07′W / 58.68°N 03.12°W / 58.68; -03.12 | ND349775 |
| Islands Common | Cambridgeshire | 52°14′N 0°16′W / 52.23°N 00.27°W / 52.23; -00.27 | TL1861 |
| Islands of Fleet | Dumfries and Galloway | 54°49′N 4°13′W / 54.82°N 04.22°W / 54.82; -04.22 | NX571495 |
| Islay | Argyll and Bute | 55°46′N 6°14′W / 55.76°N 06.23°W / 55.76; -06.23 | NR348608 |
| Isle Abbotts | Somerset | 50°58′N 2°55′W / 50.97°N 02.92°W / 50.97; -02.92 | ST3520 |
| Isle Brewers | Somerset | 50°59′N 2°55′W / 50.98°N 02.91°W / 50.98; -02.91 | ST3621 |
| Isleham | Cambridgeshire | 52°20′N 0°24′E / 52.33°N 00.40°E / 52.33; 00.40 | TL6474 |
| Isle Martin | Highland | 57°56′N 5°13′W / 57.94°N 05.22°W / 57.94; -05.22 | NH093993 |
| Isle of Arran | North Ayrshire | 55°35′N 5°14′W / 55.58°N 05.23°W / 55.58; -05.23 | NR960366 |
| Isle of Axholme | North Lincolnshire | 53°32′N 0°49′W / 53.54°N 00.82°W / 53.54; -00.82 | SE7806 |
| Isle of Bute | Argyll and Bute | 55°50′N 5°06′W / 55.84°N 05.10°W / 55.84; -05.10 | NS056655 |
| Isle of Danna | Argyll and Bute | 55°56′N 5°41′W / 55.94°N 05.69°W / 55.94; -05.69 | NR697784 |
| Isle of Dogs | London Borough of Tower Hamlets | 51°29′N 0°01′W / 51.48°N 00.02°W / 51.48; -00.02 | TQ3778 |
| Isle of Ewe | Highland | 57°50′N 5°37′W / 57.83°N 05.61°W / 57.83; -05.61 | NG852881 |
| Isle of Grain | Kent | 51°26′N 0°41′E / 51.44°N 00.68°E / 51.44; 00.68 | TQ868757 |
| Isle of Lewis | Western Isles | 58°09′N 6°40′W / 58.15°N 06.67°W / 58.15; -06.67 | NB250282 |
| Isle of Man | Isle of Man | 54°15′N 4°28′W / 54.25°N 04.47°W / 54.25; -04.47 | SC386873 |
| Isle of Man | Dumfries and Galloway | 55°03′N 3°34′W / 55.05°N 03.56°W / 55.05; -03.56 | NY0075 |
| Isle of May | Fife | 56°11′N 2°33′W / 56.18°N 02.55°W / 56.18; -02.55 | NT654990 |
| Isle of Mull | Argyll and Bute | 56°25′N 5°53′W / 56.42°N 05.88°W / 56.42; -05.88 | NM603329 |
| Isle of Nibon | Shetland Islands | 60°26′N 1°28′W / 60.43°N 01.46°W / 60.43; -01.46 | HU297727 |
| Isle of Noss | Shetland Islands | 60°08′N 1°01′W / 60.14°N 01.02°W / 60.14; -01.02 | HU545401 |
| Isle of Portland | Dorset | 50°32′N 2°26′W / 50.54°N 02.43°W / 50.54; -02.43 | SY690720 |
| Isle of Purbeck | Dorset | 50°38′N 2°02′W / 50.63°N 02.03°W / 50.63; -02.03 | SY974818 |
| Isle of Raasay | Highland | 57°25′N 6°03′W / 57.41°N 06.05°W / 57.41; -06.05 | NG568429 |
| Isle of Sheppey | Kent | 51°25′N 0°48′E / 51.41°N 00.80°E / 51.41; 00.80 | TQ948717 |
| Isle of Skye | Highland | 57°23′N 6°16′W / 57.38°N 06.26°W / 57.38; -06.26 | NG439410 |
| Isle of Stenness | Shetland Islands | 60°28′N 1°37′W / 60.47°N 01.62°W / 60.47; -01.62 | HU205764 |
| Isle of Thanet | Kent | 51°21′N 1°23′E / 51.35°N 01.39°E / 51.35; 01.39 | TR361676 |
| Isle of West Burrafirth | Shetland Islands | 60°19′N 1°33′W / 60.31°N 01.55°W / 60.31; -01.55 | HU248585 |
| Isle of Whithorn | Dumfries and Galloway | 54°41′N 4°22′W / 54.69°N 04.37°W / 54.69; -04.37 | NX4736 |
| Isle of Wight | Isle of Wight | 50°40′N 1°17′W / 50.67°N 01.29°W / 50.67; -01.29 | SZ496869 |
| Isleornsay | Highland | 57°08′N 5°49′W / 57.14°N 05.82°W / 57.14; -05.82 | NG6912 |
| Isle Ristol | Highland | 58°02′N 5°26′W / 58.04°N 05.43°W / 58.04; -05.43 | NB971111 |
| Isles of Scilly | Isles of Scilly | 49°55′N 6°17′W / 49.92°N 06.29°W / 49.92; -06.29 | SV917119 |
| Islesteps | Dumfries and Galloway | 55°02′N 3°37′W / 55.03°N 03.62°W / 55.03; -03.62 | NX9672 |
| Isleworth | Hounslow | 51°28′N 0°20′W / 51.46°N 00.34°W / 51.46; -00.34 | TQ1575 |
| Isley Walton | Leicestershire | 52°49′N 1°22′W / 52.82°N 01.37°W / 52.82; -01.37 | SK4225 |
| Isley Woodhouse | Leicestershire | | SK4225 |
| Islington | London Borough of Islington | 51°32′N 0°07′W / 51.53°N 00.11°W / 51.53; -00.11 | TQ3184 |
| Islington | Shropshire | 52°46′N 2°23′W / 52.77°N 02.38°W / 52.77; -02.38 | SJ7420 |
| Islip | Northamptonshire | 52°24′N 0°34′W / 52.40°N 00.56°W / 52.40; -00.56 | SP9879 |
| Islip | Oxfordshire | 51°49′N 1°14′W / 51.82°N 01.24°W / 51.82; -01.24 | SP5214 |
| Islivig | Western Isles | 58°07′N 7°07′W / 58.12°N 07.11°W / 58.12; -07.11 | NA9927 |
| Isombridge | Shropshire | 52°43′N 2°34′W / 52.71°N 02.57°W / 52.71; -02.57 | SJ6113 |
| Istead Rise | Kent | 51°24′N 0°20′E / 51.40°N 00.34°E / 51.40; 00.34 | TQ6370 |
| Isycoed | Wrexham | 53°02′N 2°53′W / 53.04°N 02.89°W / 53.04; -02.89 | SJ4050 |
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