| Merthyr Tydfil telephone exchange | Corporate office | Merthyr Tydfil telephone exchange, 97 High St, Merthyr Tydfil CF47 8UD | | | Merthyr Tydfil | | CF47 8UD |
| Tenneco Walker Uk Ltd | Corporate office | Tenneco Walker Uk Ltd, Merthyr Tydfil CF48 2TA | http://tenneco.com/ | +44 1495 711211 | Merthyr Tydfil | | CF48 2TA |
| Welsh Government | Government office | Welsh Government, Rhyd-y-car, Merthyr Tydfil CF48 1UZ | | | Merthyr Tydfil | | CF48 1UZ |
| Merthhyr Tydfil DTC | Corporate office | Merthhyr Tydfil DTC, Pentrebach, Merthyr Tydfil CF48 4DR | | | Merthyr Tydfil | Pentrebach | CF48 4DR |
| Merthyr Tydfil Register Office | Registry office;Government office | Merthyr Tydfil Register Office, 26 High St, Merthyr Tydfil CF47 8DP | http://www.merthyr.gov.uk/ | +44 1685 727333 | Merthyr Tydfil | | CF47 8DP |
| Merthyr Tydfil County Borough Council | Council | Merthyr Tydfil County Borough Council, Civic Centre, Castle St, Merthyr Tydfil CF47 8AN | http://www.merthyr.gov.uk/ | +44 1685 725000 | Merthyr Tydfil | | CF47 8AN |
| General Dynamics Merthyr | Corporate office | General Dynamics Merthyr, 13 A4054, Troedyrhiw, Pentrebach, Merthyr Tydfil CF48 4LA | https://www.generaldynamics.uk.com/ | | Merthyr Tydfil | Troedyrhiw, Pentrebach | |
| Dyfodol Merthyr Tydfil | | 2nd Floor, Dyfodol Merthyr Tydfil, Oldway House, Castle St, Merthyr Tydfil CF47 8UX | | +44 7720 830129 | Merthyr Tydfil | | CF47 8UX |
| We Love Merthyr | Business-to-Business service | We Love Merthyr, Redhouse Cymru, High St, Merthyr Tydfil CF47 8AE | https://welovemerthyr.net/ | +44 7871 606966 | Merthyr Tydfil | | CF47 8AE |
| iTeams UK | Corporate office | First Floor, iTeams UK, 62 High St, Merthyr Tydfil CF47 8DE | http://iteams.org.uk/ | +44 685648688 | Merthyr Tydfil | | CF47 8DE |
| Expert Business Blueprint | Corporate office | Expert Business Blueprint, 19 Park Row, Merthyr Tydfil CF47 8TG | | | Merthyr Tydfil | | CF47 8TG |
| Welsh European Funding Office | Government office | Welsh European Funding Office, Rhydycar Business Park, Rhydycar, Merthyr Tydfil CF48 1UZ | | +44 845 010 3355 | Merthyr Tydfil | | CF48 1UZ |
| ABACUS ASSESSMENTS | Corporate office;Disability services and support organization | Office 12, ABACUS ASSESSMENTS, Crownford House, Swan St, Merthyr Tydfil CF47 8EU | http://abacusassessments.co.uk/ | +44 7377 375479 | Merthyr Tydfil | | CF47 8EU |
| Merthyr (South Wales) Ltd. | Mining company | Merthyr (South Wales) Ltd., Cwmbargoed Disposal Point, Fochriw Rd, Cwmbargoed, Merthyr Tydfil CF48 4AE | | +44 870 111 5600 | Merthyr Tydfil | | CF48 4AE |
| Royal Mail Delivery Office Merthyr | Shipping and postal service | Royal Mail Delivery Office Merthyr, Merthyr Tydfil Delivery Office, Vanguard Yard, Merthyr Tydfil CF47 0AZ | http://www.royalmail.com/ | +44 345 774 0740 | Merthyr Tydfil | | CF47 0AZ |
| Merthyr Tydfil County Borough Council | District council | Merthyr Tydfil County Borough Council, Unit 5 Triangle Business Park Rd, Pentrebach, Merthyr Tydfil CF48 4TQ | https://www.merthyr.gov.uk/ | | Merthyr Tydfil | Pentrebach | CF48 4TQ |
| Anglesey Insurance Services | Insurance agency | Anglesey Insurance Services, 6 Uxbridge Square, Menai Bridge LL59 5AT | | +44 1248 716746 | Menai Bridge | | LL59 5AT |
| Geosho | Corporate office | Geosho, 6 Bridge St, Caernarfon LL55 1AB | http://bausho.com/ | +44 330 555 0340 | Caernarfon | | LL55 1AB |
| Bleeper Services | Corporate office | Bleeper Services, M-SParc Menai Science Park, Gaerwen LL60 6AG | https://www.bleeperltd.co.uk/ | +44 1257 794333 | Gaerwen | | LL60 6AG |
| NMWTRA | Corporate office | NMWTRA, Unit 5, Llys Britannia, Parc Menai, Bangor LL57 4BN | | +44 1286 685180 | Bangor | | LL57 4BN |
| Corporate Angels | Reflexologist;Alternative medicine practitioner;Massage spa;Reiki therapist;Spa;Sports injury clinic;Sports massage therapist | Corporate Angels, Mynydd Mechell, Amlwch LL68 0TG | | | Amlwch | Mynydd Mechell | LL68 0TG |
| Baezel | Corporate office | Baezel, Woodlands House, Parc Britannia, Bangor LL57 4FA | | +44 1248 675800 | Bangor | | LL57 4FA |
| Anglesey Rum Co | Distillery | Unit 18, Anglesey Rum Co, Gaerwen Industrial Estate, Gaerwen LL60 6HR | http://www.angleseyrum.co.uk/ | +44 1248 421352 | Gaerwen | | LL60 6HR |
| OCISA | Corporate office | OCISA, Ynys Faelog Cottage, Druid Rd, Menai Bridge, Penyclip LL59 5BY | http://ocisa.org.uk/ | | Penyclip | Menai Bridge | LL59 5BY |
| W P Williams | Corporate office | W P Williams, Coch Y Moel, Penysarn LL69 9AQ | | +44 1407 830581 | Penysarn | | LL69 9AQ |
| Management and Leisure Strategies | Corporate office | Management and Leisure Strategies, 10 Trehwfa, Bangor LL57 4TE | http://business-with-pleasure.com/ | +44 870 063 0064 | Bangor | | LL57 4TE |
| BlakeIsHere Studios | Corporate office | BlakeIsHere Studios, 13 Ffordd Y Castell, Bangor LL57 1SU | | | Bangor | | LL57 1SU |
| Helix Operations | Corporate office | Helix Operations, Woodlands House, Parc Britannia, Parc Menai, Bangor LL57 4FA | https://helixoperations.com/ | +44 1286 873583 | Bangor | Parc Menai | LL57 4FA |
| Môn Communities Forward | Employment Centre;Non-profit organisation | Môn Communities Forward, 63 Market St, Holyhead LL65 1UN | http://www.moncf.co.uk/ | +44 1407 762004 | Holyhead | | LL65 1UN |
| GraphVine Ltd | Corporate office | GraphVine Ltd, M-Spark, Enterprise Hub, Science Pk, Gaerwen LL60 6AG | http://www.graphvine.co.uk/ | +44 7732 843206 | Gaerwen | | LL60 6AG |
| Wool Testing Authority Europe | Corporate office | Wool Testing Authority Europe, Caernarfon LL55 2BD | | | Caernarfon | | |
| DVSA theory test centre | Corporate office | DVSA theory test centre, 30 Dean St, Bangor LL57 1UR | | | Bangor | | LL57 1UR |
| The Essential Expert | Corporate office | M, The Essential Expert, Sparc LL60 6AG | https://www.theessentialexpert.co.uk/ | +44 7929 521358 | Sparc | | LL60 6AG |
| Management & Leisure Strategie | Corporate office | Management & Leisure Strategie, Nefoedd Bach, 10 Trehwfa, Bangor LL57 4TE | http://paintball-roadshow.com/ | +44 870 063 0063 | Bangor | | LL57 4TE |
| Dylan's Restaurant Head Office | Corporate office;Restaurant | Dylan's Restaurant Head Office, Unit 7 Pen-Yr-Orsedd, Industrial Estate Rd, Llangefni LL77 7AW | https://www.dylansrestaurant.co.uk/ | +44 1248 750814 | Llangefni | | LL77 7AW |
| Canolfan Busnes Môn | Anglesey Business Centre | Corporate office | Canolfan Busnes Môn | Anglesey Business Centre, Llangefni LL77 7XA | https://www.ynysmon.llyw.cymru/cy/Busnes/Canolfan-Fusnes-Môn/Ynglŷn-â-Canolfan-Busnes-Môn.aspx | +44 1248 752435 | Llangefni | Llangefni | |
| Isle Of Anglesey County Council | Council | Isle Of Anglesey County Council, Llangefni LL77 7TW | http://www.anglesey.gov.uk/ | +44 1248 750057 | Llangefni | | LL77 7TW |
| Nuffield Centre | Corporate office | Nuffield Centre, Llanfairpwllgwyngyll LL61 6NY | | | Llanfairpwllgwyngyll | Llanfairpwllgwyngyll | |
| GLI UK Gaming Ltd | Corporate office;Software company | GLI UK Gaming Ltd, Llys Helyg, Ffordd Y Llyn, Parc Menai, Bangor LL57 4EZ | | +44 1248 660550 | Bangor | Parc Menai | LL57 4EZ |
| Anglesey Construction Ltd | Corporate office | Anglesey Construction Ltd, 18 Church St, Llangefni LL77 7DY | http://angleseyconstruction.co.uk/ | +44 7432 210466 | Llangefni | | LL77 7DY |
| Parc Menai | Business Park | Suite 1, Parc Menai, llys Britannia, Parc Menai, Bangor LL57 4BN | | | Bangor | Parc Menai | |
| Môn CF | Employment Centre;Non-profit organisation | Môn CF, Canolfan Ebeneser, Llangefni LL77 7PN | https://www.moncf.co.uk/ | +44 1407 762004 | Llangefni | | LL77 7PN |
| Canolfan Byron | Corporate office | Canolfan Byron, Mona Industrial Park, Holyhead LL65, UK | | +44 1407 883333 | Holyhead | | LL65, UK |
| SocialCru Renewables & Energy | Corporate office | SocialCru Renewables & Energy, M-Sparc, Parc Gwyddoniaeth Menai, Ynys Mon LL60 6AG | http://socialcru-renewables.co.uk/ | | Gaerwen | | LL60 6AG |
| Pen Cob | Corporate office | Pen Cob, 5BA, High St, Bodorgan | | | Bodorgan | | |
| Medic 1 | Corporate office;Ambulance service | Medic 1, Parc Bryn Cefni, Industrial Estate Rd, Llangefni LL77 7JA | https://www.medic1.co.uk/ | +44 845 004 4999 | Llangefni | | LL77 7JA |
| Amlwch Masonic Hall | Corporate office | Amlwch Masonic Hall, Glanrhos Bungalow, Masonic, Amlwch LL68 9EY | | +44 1407 831741 | Amlwch | | LL68 9EY |
| K&N | Corporate office | K&N, Gaerwen LL60 6DW | | | Gaerwen | Gaerwen | |
| Menai Bridge War Memorial Community Centre | Corporate office | Menai Bridge War Memorial Community Centre, Water St, Menai Bridge LL59 5DD | https://www.iwm.org.uk/memorials/item/memorial/24480 | | Menai Bridge | | |
| Môn CF | Employment Centre;Non-profit organisation | Môn CF, Wood St, Menai Bridge LL59 5AJ | http://www.moncf.co.uk/ | +44 1407 762004 | Menai Bridge | | LL59 5AJ |
| Canolfan Gwaith Bangor | Bangor Jobcentre | Government office | 322-330, Canolfan Gwaith Bangor | Bangor Jobcentre, Y, 322-330 High St, Bangor LL57 1YA | https://www.gov.uk/contact-jobcentre-plus | +44 800 169 0190 | Bangor | | LL57 1YA |
| Bangor City Council | Council | Bangor City Council, Ffordd Gwynedd, Bangor LL57 1DT | http://bangorcitycouncil.com/ | +44 1248 352421 | Bangor | | LL57 1DT |
| wn y Mor Bungalow Limited | Corporate office | wn y Mor Bungalow Limited, Swn y Mor Bungalow & Cabin Machroes, Pwllheli LL53 7EU | http://swnymorbungalow.com/ | | Pwllheli | Bwlchtocyn | LL53 7EU |
| Hwb Menter / Enterprise Hub @M-SParc | Business management consultant | Hwb Menter / Enterprise Hub @M-SParc, Parc Gwyddoniaeth Menai, Gaerwen LL60 6AG | http://hwbmenter.cymru/ | +44 1248 858070 | Gaerwen | | LL60 6AG |
| North Wales Locations Limited | Logistics service | North Wales Locations Limited, Pencilan, Penybryn Pl, Bethesda, Workshop LL57 3BE | https://www.northwaleslocations.com/ | +44 1248 544047 | Workshop | Bethesda | LL57 3BE |
| Careers Wales | Career guidance service | Careers Wales, Llys Gwynedd, Ffordd Gwynedd, Bangor LL57 1DT | http://www.careerswales.com/en/ | +44 800 028 4844 | Bangor | Bangor | LL57 1DT |
| General Business Support [GBS] | Consultant;Service establishment | | | +44 7887 535813 | | | |
| Finance and Development Corporation Ltd | Corporate office | Finance and Development Corporation Ltd, 3 Prince's Rd, Bangor LL57 2BD | | +44 845 765 2015 | Bangor | | LL57 2BD |
| Cyngor Gwynedd | Council | Cyngor Gwynedd, Shirehall St, Caernarfon LL55 1SH | https://www.gwynedd.llyw.cymru/ | +44 1766 771000 | Caernarfon | | LL55 1SH |
| Llywodraeth Cymru Welsh Government | Corporate office | Llywodraeth Cymru Welsh Government, 10 Doc Fictoria, Caernarfon LL55 1TH | | | Caernarfon | | LL55 1TH |
| GO Wales Bangor | University department;Business development service;Higher education;Human resources;Recruiter;University | GO Wales Bangor, Neuadd Rathbone, Ffordd y Coleg, Prifysgol Bangor / Bangor University, Bangor LL57 2DF | http://www.gowales.co.uk/ | +44 1248 383586 | Bangor | | LL57 2DF |
| Swyddfa Dwyfor | Corporate office;Government office | Swyddfa Dwyfor, Pwllheli LL53 5AA | https://www.gwynedd.llyw.cymru/en/Council/Contact-us/Contact-us.aspx | | Pwllheli | | |
| Welsh Government | Local Government Office;Government office;Regional government office | Welsh Government, Victoria Dock, Caernarfon LL55 1TH | https://gov.wales/ | +44 300 060 4400 | Caernarfon | | LL55 1TH |
| North Wales Networks | Corporate office | North Wales Networks, Unnamed Road, Llangefni | | | Llangefni | | |
| Derw Coffee Ltd | Corporate office;Service establishment | | https://www.derwcoffee.co.uk/ | +44 7894 981993 | | | |
| Lle Cyfyngedig | Property Rental Agency | Lle Cyfyngedig, 6 Holyhead Rd, Bangor LL57 2EG | https://www.llecyf-bangor-properties.com/ | +44 1248 371130 | Bangor | | LL57 2EG |
| Gwynedd | | Gwynedd | | | | | |
| M-SParc | Corporate office;Co-working Space;Events Venue;Laboratory;Technology park | M-SParc, M-SParc Menai Science Park, Gaerwen LL60 6AG | http://www.m-sparc.com/ | +44 1248 858000 | Gaerwen | Gaerwen | LL60 6AG |
| Gwynedd Business Network | Business networking company | Gwynedd Business Network, Parc Menai, Intec, Bangor LL57 4FG | | +44 1286 679677 | Bangor | | LL57 4FG |
| Partnerieth Tirwedd y Carneddau | Local Government Office | Partnerieth Tirwedd y Carneddau, Canolfan Cefnfaes, Mostyn Ter, Bethesda, Bangor LL57 3AB | | | Bangor | Bethesda | LL57 3AB |
| Anheddau Regional Office | Non-profit organisation | 1, Anheddau Regional Office, Llys Y Fedwen, Ffordd Y Parc, Bangor LL57 4BN | | | Bangor | | LL57 4BN |
| usdaw union warrington office | Trade Union;Service establishment | | | +44 7852 636691 | | | |
| Natural Resources Wales | Environment office | Natural Resources Wales, Bangor Vehicle Registration Office, Maes y Ffynnon, Penrhos Rd, Penrhosgarnedd, Bangor LL57 2DW | http://naturalresourceswales.gov.uk/ | +44 300 065 3000 | Bangor | Penrhosgarnedd | LL57 2DW |
| Cydweithfa - Canolfan Cefnfaes Co-Working Space | Co-working Space | Cydweithfa - Canolfan Cefnfaes Co-Working Space, Canolfan Cefnfaes, Mostyn Ter, Bethesda, Bangor LL57 3AD | https://partneriaethogwen.simplybook.it/ | +44 1248 602131 | Bangor | Bethesda | LL57 3AD |
| North West Wales Coroners Office | Council | North West Wales Coroners Office, HM Coroner’s Office, Shirehall St, Caernarfon LL55 1SH | | +44 1286 672804 | Caernarfon | | LL55 1SH |
| Agored Cymru | Educational consultant | Agored Cymru, Llys Onnen, Ffordd Y Llyn, Parc Menai, Bangor LL57 4DF | https://www.agored.cymru/ | +44 1248 670011 | Bangor | Parc Menai | LL57 4DF |
| InTec | Office rental agency | InTec, Ffordd Y Parc, Parc Menai, Bangor LL57 4FG | https://www.gwynedd.llyw.cymru/en/Businesses/Businesses.aspx | +44 1248 672600 | Bangor | Parc Menai | LL57 4FG |
| Flintshire County Council | Council | Flintshire County Council, County Hall, Mold CH7 6NB | http://www.flintshire.gov.uk/ | +44 1352 702121 | Mold | | CH7 6NB |
| Flintshire County Council | Council | Flintshire County Council, Alltami, Mold CH7 6LG | https://www.flintshire.gov.uk/ | +44 303 123 1113 | Mold | Alltami | |
| Gift Company HEAD OFFICE | Gift shop | Gift Company HEAD OFFICE, Whittle Cl, Deeside CH5 2QE | http://www.giftcompany.com/ | +44 1244 536945 | Deeside | | CH5 2QE |
| Y Fflint Sir y Fflint yn Cysylltu | Flintshire Connects Flint | Local Government Office | Y Fflint Sir y Fflint yn Cysylltu | Flintshire Connects Flint, Church St, Flint CH6 5BD | https://www.flintshire.gov.uk/en/Resident/Contact-Us/Flintshire-Connects.aspx | | Flint | | CH6 5BD |
| Flintshire County Council | Local Government Office | Flintshire County Council, Hawarden, Deeside CH5 3FF | http://www.flintshire.gov.uk/ | +44 1352 703331 | Deeside | Hawarden | |
| Flintshire County Council Housing Estate Management | Department of housing | Flintshire County Council Housing Estate Management, Kingshead Building, High St, Holywell CH8 7TH | http://www.flintshire.gov.uk/ | +44 1352 701750 | Holywell | | CH8 7TH |
| Flintshire County Unison Office | Trade Union | Flintshire County Unison Office, Llwynegrin Hall County Hall, Mold CH7 6NF | https://flintshire.unison.site/ | +44 1352 704300 | Mold | | CH7 6NF |
| Flint Town Hall | Local Government Office | Flint Town Hall, Market Square, Flint CH6 5NW | http://flinttowncouncil.co.uk/ | +44 1352 734414 | Flint | | CH6 5NW |
| Family Information Service Flintshire | Childcare Agency | Family Information Service Flintshire, County Offices, Church St, Flint CH6 5AD | https://www.flintshire.gov.uk/en/Resident/Social-Services/Family-Information-Service.aspx | +44 1352 703500 | Flint | | CH6 5AD |
| Deeside Enterprise Centre | Business park | Deeside Enterprise Centre, Enterprise Centre, Rowley's Dr, Shotton, Deeside CH5 1PP | | +44 1352 703060 | Deeside | Shotton | CH5 1PP |
| Care and Repair North East Wales | Corporate office | Care and Repair North East Wales, Rowley's Dr, Shotton, Deeside CH5 1PY | https://careandrepair.org.uk/agencies/care-repair-north-east-wales/ | +44 1352 758700 | Deeside | Shotton | CH5 1PY |
| Flintshire Carelink | Council | Flintshire Carelink, Acacia Close, Bryn Hilyn Ln, Mold CH7 1JZ | http://www.flintshire.gov.uk/ | | Mold | | CH7 1JZ |
| EEdu | Corporate office | EEdu, 18 Poplar Ave, Higher Shotton, Deeside CH5 1NJ | | +44 7985 623375 | Deeside | Higher Shotton | CH5 1NJ |
| Flintshire Local Voluntary Council | Non-profit organisation | Flintshire Local Voluntary Council, Corlan, Unit 3, Mold Business Park, Wrexham Road, Mold CH7 1XP | http://www.flvc.org.uk/ | +44 1352 744000 | Mold | | CH7 1XP |
| Flintshire County Council Adult Social Care | Social services organisation;Council | Flintshire County Council Adult Social Care, County Hall, Mold CH7 6NN | | +44 300 085 8858 | Mold | | CH7 6NN |
| North Wales Social | Business networking company | North Wales Social, Florence House, Bromfield Ln, Mold CH7 1JW | http://www.northwalessocial.co.uk/ | | Mold | | CH7 1JW |
| Flintshire Council Alltami Depot | Public Works Department | Flintshire Council Alltami Depot, A494, Mold CH7 6LG | https://committeemeetings.flintshire.gov.uk/ieDecisionDetails.aspx?AIId=20461&LLL=0 | +44 1352 701234 | Mold | | CH7 6LG |
| David Wood Baking (Creative Foods). | Corporate office | David Wood Baking (Creative Foods)., Unnamed Road, Flint CH6 5EY | | | Flint | | CH6 5EY |
| Karma International Ltd | Corporate office | Karma International Ltd, St Asaph, Saint Asaph LL17 0DB | | +44 7809 232404 | Saint Asaph | Saint Asaph | |
| FlintShare | Corporate office | FlintShare, Bryn Teg, Llanferres, Mold CH7 5SF | http://flintshare.org/ | +44 7480042 | Mold | Llanferres | CH7 5SF |
| The Collins' | Corporate office | The Collins', 17 Bryn Onnen, Abergele LL22 8DE | | | Abergele | | LL22 8DE |
| BC.KBGG GGF | Corporate office | BC.KBGG GGF, Post Office Ln, Mold CH7 5JD | | | Mold | | CH7 5JD |
| Glascoed Training Rooms | Corporate office | Glascoed Training Rooms, Unnamed Road LL22 | | | Abergele | | LL22 |
