Existing OS MasterMap^® customers contact page

How to contact us by phone or email

If you are an OS MasterMap customer and have an enquiry or would like some help please contact the appropriate helpdesk below:

Mapping Services Agreement (MSA) & Local Authorities
Email: msa@ordnancesurvey.co.uk
Telephone: 023 8079 2706

Pan-government Agreement (PGA) & Central Government Organisations
Email: pgahelpdesk@ordnancesurvey.co.uk
Telephone: 0845 337 0440

National Health Service
Email: nhshelpdesk@ordnancesurvey.co.uk
Telephone: 0845 458 0650

Commercial & Housing Associations
Email: digitalsalesenquiries@ordnancesurvey.co.uk
Telephone: 023 8030 5520

Our helplines are open from 8.30am to 5.30pm, Monday to Friday