Below is visualization of the GIS border data we have for United Kingdom. Features include:

• Simplified to load quickly with minimal loss of detail (2091.3 KB .json file).
• License: Creative Commons Attribution 4.0
• First-level administrative regions identified by name and id in the source code.
• All files use WGS84 projection. Easily reproject as needed.

Included Administrative Regions

{
    "GBABD": "Aberdeenshire", 
    "GBABE": "Aberdeen", 
    "GBAGB": "Argyll and Bute", 
    "GBAGY": "Anglesey", 
    "GBANS": "Angus", 
    "GBANT": "Antrim", 
    "GBARD": "Ards", 
    "GBARM": "Armagh", 
    "GBBAS": "Bath and North East Somerset", 
    "GBBBD": "Blackburn with Darwen", 
    "GBBDF": "Bedford", 
    "GBBDG": "Barking and Dagenham", 
    "GBBEN": "Brent", 
    "GBBEX": "Bexley", 
    "GBBFS": "Belfast", 
    "GBBGE": "Bridgend", 
    "GBBGW": "Blaenau Gwent", 
    "GBBIR": "Birmingham", 
    "GBBKM": "Buckinghamshire", 
    "GBBLA": "Ballymena", 
    "GBBLY": "Ballymoney", 
    "GBBMH": "Bournemouth", 
    "GBBNB": "Banbridge", 
    "GBBNE": "Barnet", 
    "GBBNH": "Brighton and Hove", 
    "GBBNS": "Barnsley", 
    "GBBOL": "Bolton", 
    "GBBPL": "Blackpool", 
    "GBBRC": "Bracknell Forest", 
    "GBBRD": "Bradford", 
    "GBBRY": "Bromley", 
    "GBBST": "Bristol", 
    "GBBUR": "Bury", 
    "GBCAM": "Cambridgeshire", 
    "GBCAY": "Caerphilly", 
    "GBCBF": "Central Bedfordshire", 
    "GBCGN": "Ceredigion", 
    "GBCGV": "Craigavon", 
    "GBCHE": "Cheshire East", 
    "GBCHW": "Cheshire West and Chester", 
    "GBCKF": "Carrickfergus", 
    "GBCKT": "Mid Ulster", 
    "GBCLD": "Calderdale", 
    "GBCLK": "Clackmannanshire", 
    "GBCLR": "Coleraine", 
    "GBCMA": "Cumbria", 
    "GBCMD": "Camden", 
    "GBCMN": "Carmarthenshire", 
    "GBCON": "Cornwall", 
    "GBCOV": "Coventry", 
    "GBCRF": "Cardiff", 
    "GBCRY": "Croydon", 
    "GBCSR": "Castlereagh", 
    "GBCWY": "Conwy", 
    "GBDAL": "Darlington", 
    "GBDBY": "Derbyshire", 
    "GBDEN": "Denbighshire", 
    "GBDER": "Derby", 
    "GBDEV": "Devon", 
    "GBDGN": "Dungannon", 
    "GBDGY": "Dumfries and Galloway", 
    "GBDNC": "Doncaster", 
    "GBDND": "Dundee", 
    "GBDOR": "Dorset", 
    "GBDOW": "Down", 
    "GBDRY": "Derry", 
    "GBDUD": "Dudley", 
    "GBDUR": "Durham", 
    "GBEAL": "Ealing", 
    "GBEAY": "East Ayrshire", 
    "GBEDH": "Edinburgh", 
    "GBEDU": "East Dunbartonshire", 
    "GBELN": "East Lothian", 
    "GBELS": "Eilean Siar", 
    "GBENF": "Enfield", 
    "GBERW": "East Renfrewshire", 
    "GBERY": "East Riding of Yorkshire", 
    "GBESS": "Essex", 
    "GBESX": "East Sussex", 
    "GBFAL": "Falkirk", 
    "GBFER": "Fermanagh", 
    "GBFIF": "Fife", 
    "GBFLN": "Flintshire", 
    "GBGAT": "Gateshead", 
    "GBGLG": "Glasgow", 
    "GBGLS": "Gloucestershire", 
    "GBGRE": "Greenwich", 
    "GBGWN": "Gwynedd", 
    "GBHAL": "Halton", 
    "GBHAM": "Hampshire", 
    "GBHAV": "Havering", 
    "GBHCK": "Hackney", 
    "GBHEF": "Herefordshire", 
    "GBHIL": "Hillingdon", 
    "GBHLD": "Highland", 
    "GBHMF": "Hammersmith and Fulham", 
    "GBHNS": "Hounslow", 
    "GBHPL": "Hartlepool", 
    "GBHRT": "Hertfordshire", 
    "GBHRW": "Harrow", 
    "GBHRY": "Haringey", 
    "GBIOS": "Isles of Scilly", 
    "GBIOW": "Isle of Wight", 
    "GBISL": "Islington", 
    "GBIVC": "Inverclyde", 
    "GBKEC": "Kensington and Chelsea", 
    "GBKEN": "Kent", 
    "GBKHL": "Kingston upon Hull", 
    "GBKIR": "Kirklees", 
    "GBKTT": "Kingston upon Thames", 
    "GBKWL": "Knowsley", 
    "GBLAN": "Lancashire", 
    "GBLBH": "Lambeth", 
    "GBLCE": "Leicester", 
    "GBLDS": "Leeds", 
    "GBLEC": "Leicestershire", 
    "GBLEW": "Lewisham", 
    "GBLIN": "Lincolnshire", 
    "GBLIV": "Liverpool", 
    "GBLMV": "Limavady", 
    "GBLND": "City", 
    "GBLRN": "Larne", 
    "GBLSB": "Lisburn", 
    "GBLUT": "Luton", 
    "GBMAN": "Manchester", 
    "GBMDB": "Middlesbrough", 
    "GBMDW": "Medway", 
    "GBMFT": "Magherafelt", 
    "GBMIK": "Milton Keynes", 
    "GBMLN": "Midlothian", 
    "GBMON": "Monmouthshire", 
    "GBMRT": "Merton", 
    "GBMRY": "Moray", 
    "GBMTY": "Merthyr Tydfil", 
    "GBMYL": "Moyle", 
    "GBNAY": "North Ayshire", 
    "GBNBL": "Northumberland", 
    "GBNDN": "North Down", 
    "GBNEL": "North East Lincolnshire", 
    "GBNET": "Newcastle upon Tyne", 
    "GBNFK": "Norfolk", 
    "GBNGM": "Nottingham", 
    "GBNLK": "North Lanarkshire", 
    "GBNLN": "North Lincolnshire", 
    "GBNSM": "North Somerset", 
    "GBNTA": "Newtownabbey", 
    "GBNTH": "Northamptonshire", 
    "GBNTL": "Neath Port Talbot", 
    "GBNTT": "Nottinghamshire", 
    "GBNTY": "North Tyneside", 
    "GBNWM": "Newham", 
    "GBNWP": "Newport", 
    "GBNYK": "North Yorkshire", 
    "GBNYM": "Newry and Mourne", 
    "GBOLD": "Oldham", 
    "GBOMH": "Omagh", 
    "GBORK": "Orkney", 
    "GBOXF": "Oxfordshire", 
    "GBPEM": "Pembrokeshire", 
    "GBPKN": "Perthshire and Kinross", 
    "GBPLY": "Plymouth", 
    "GBPOL": "Poole", 
    "GBPOR": "Portsmouth", 
    "GBPOW": "Powys", 
    "GBPTE": "Peterborough", 
    "GBRCC": "Redcar and Cleveland", 
    "GBRCH": "Rochdale", 
    "GBRCT": "Rhondda, Cynon, Taff", 
    "GBRDB": "Redbridge", 
    "GBRDG": "Reading", 
    "GBRFW": "Renfrewshire", 
    "GBRIC": "Richmond upon Thames", 
    "GBROT": "Rotherham", 
    "GBRUT": "Rutland", 
    "GBSAW": "Sandwell", 
    "GBSAY": "South Ayrshire", 
    "GBSCB": "Scottish Borders", 
    "GBSFK": "Suffolk", 
    "GBSFT": "Sefton", 
    "GBSGC": "South Gloucestershire", 
    "GBSHF": "Sheffield", 
    "GBSHN": "Merseyside", 
    "GBSHR": "Shropshire", 
    "GBSKP": "Stockport", 
    "GBSLF": "Salford", 
    "GBSLG": "Slough", 
    "GBSLK": "South Lanarkshire", 
    "GBSND": "Sunderland", 
    "GBSOL": "Solihull", 
    "GBSOM": "Somerset", 
    "GBSOS": "Southend-on-Sea", 
    "GBSRY": "Surrey", 
    "GBSTB": "Strabane", 
    "GBSTE": "Stoke-on-Trent", 
    "GBSTG": "Stirling", 
    "GBSTH": "Southampton", 
    "GBSTN": "Sutton", 
    "GBSTS": "Staffordshire", 
    "GBSTT": "Stockton-on-Tees", 
    "GBSTY": "South Tyneside", 
    "GBSWA": "Swansea", 
    "GBSWD": "Swindon", 
    "GBSWK": "Southwark", 
    "GBTAM": "Tameside", 
    "GBTFW": "Telford and Wrekin", 
    "GBTHR": "Thurrock", 
    "GBTOB": "Torbay", 
    "GBTOF": "Torfaen", 
    "GBTRF": "Trafford", 
    "GBTWH": "Tower Hamlets", 
    "GBVGL": "Vale of Glamorgan", 
    "GBWAR": "Warwickshire", 
    "GBWBK": "West Berkshire", 
    "GBWDU": "West Dunbartonshire", 
    "GBWFT": "Waltham Forest", 
    "GBWGN": "Wigan", 
    "GBWIL": "Wiltshire", 
    "GBWKF": "Wakefield", 
    "GBWLL": "Walsall", 
    "GBWLN": "West Lothian", 
    "GBWLV": "Wolverhampton", 
    "GBWND": "Wandsworth", 
    "GBWNM": "Royal Borough of Windsor and Maidenhead", 
    "GBWOK": "Wokingham", 
    "GBWOR": "Worcestershire", 
    "GBWRL": "Halton", 
    "GBWRT": "Warrington", 
    "GBWRX": "Wrexham", 
    "GBWSM": "Westminster", 
    "GBWSX": "West Sussex", 
    "GBYOR": "York", 
    "GBZET": "Shetland Islands"
}

Below is visualization of the GIS border data we have for United Kingdom. Features include:

• Simplified to load quickly with minimal loss of detail (753.3 KB .json file).
• License: Creative Commons Attribution 4.0
• All files use WGS84 projection. Easily reproject as needed.