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Field parcel numbers

Learn where to obtain field parcel numbers and measurements.

Field parcel numbers are now the responsibility of the Rural Payments Agency (RPA); phone 0845 6037777 or email csc@rpa.gsi.gov.uk.

To obtain a field parcel measurement, please contact your nearest walk-in map outlet. One hectare equals 2.47 acres.

The 'S' symbol shown over a line or lines on our maps

The elongated ’S’ symbol is an areas brace symbol. Formerly known as a field tie, this joins areas of land together to give a single field parcel number. Measure this area to calculate the combined total area measurement.

Field parcel numbers on historical maps

Field parcel numbers are shown on 1:2500 scale National Grid and County Series historical maps. These are now only available via national archives and copyright libraries or via our partners Groundsure and Landmark Information Group. Learn more about where to buy historical mapping.

What the three- (pre-war) and four-figure field parcel numbers represent?

On County Series maps, field parcel numbers – usually three numbers – are based on areas within each separate parish within a county. The parish areas are numbered consecutively for each parish within the county. Therefore the three-figure number can repeat itself in each parish. To assist with the investigation for any County Series enquiries, please give as much information for the location, type of building, landmarks and so on.

Four-figure field numbers are derived from our National Grid reference system. The adjoining sheet edge(s) have been checked to ensure that the numbers remained consistent with the National Grid.

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For general enquiries, complaints, feedback or suggestions, email: customerservices@ordnancesurvey.co.uk or call us on 08456 05 05 05