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The postcode area forms a coastal strip from South Tyneside in the north to eastern part of County Durham in the south. The Sunderland post town occupies six of the geographic districts, and forms a group at the north; occupying approximately half of the total area. The other half, comprising the Seaham and Peterlee post towns, forms two large postcode districts in a line running south from Sunderland.
The approximate coverage of the postcode districts: