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OSM Postcode Stats for SN2 Postal District

Rank	Sector	NG	Units	Geo. Units	Mapped	%
1	SN2 8		80	78	12	15.4%
2	SN2 1		227	220	20	9.1%
3	SN2 5		128	128	9	7.0%
4	SN2 7		169	169	11	6.5%
5	SN2 2		246	244	11	4.5%
6	SN2 9	*	105	1	0	0.0%
Totals			955	840	63	7.5%

Explanation of the columns in the table above:

NG: Flag for a non-geographic sector that contains only PO Box or Large User addresses. Data comes from Royal Mail. Updated lists appear to be released in July and January each year as part of the PAF Statistics.
Units: The total number of units (individual postcodes) listed in Code-Point Open
Geo. Units: An estimate of the number of geographic units, computed as follows: The number of postal units which either exist in OSM or have fewer than 5 or more other units with the same coordinates in Code-Point Open. This is designed to exclude PO Box units that are located at Royal Mail Delivery Offices.
Mapped: The number of unique valid units appearing as an addr:postcode value in OSM.
%: OSM progress towards mapping at least one example of each unit, measured against the number of geographic units.

Data derived from OpenStreetMap data, © OpenStreetMap Contributors, licensed under Open Data Commons Open Database License (ODbL). Data derived in part using Code-Point Open under the Open Government Licence v3; Contains OS data © Crown copyright and database right 2020; Contains Royal Mail data © Royal Mail copyright and Database right 2016; Contains National Statistics data © Crown copyright and database right 2020.