It replaced a system of postal district numbers introduced in 1935, with the postcode incorporating the old one or two-digit district number for example, "45, York Place, Edinburgh, 1"[3] became ""45 York Place, Edinburgh EH1 3HP".[4]
Coverage
The approximate coverage of the postcode districts:
Mostly consists of Edinburgh's Old Town. Also hosts the old GPO building (at EH1 1AA) and the areas immediately to the north of this are also included, that is St James Quarter and the areas down Leith Street and Broughton Street.
Radiates from the older and more central areas out to the suburban areas added to them, as the city grew outwards during the 20th century. EH4, then, branches out from Dean Village and Comely Bank along a corridor centred on the A90 as far as Barnton and Cramond. Central to this area is the Sainsbury's in Craigleith Retail Park adjacent to the A90.
EH5
EDINBURGH
Based on a village formerly separate from the city; in this case, Granton on the Firth of Forth. EH5 extends inwards from the coast to Ferry Road.
EH6
EDINBURGH
Covers Leith, as well as Newhaven bordering it on the west.
EH7
EDINBURGH
The inner city area between central Edinburgh and Leith, and radiates out to Restalrig and Craigentinny.
EH8
EDINBURGH
The inner city Southside, Newington and Canongate areas, in the west of the postcode area. It spreads eastwards around Holyrood Park to take in areas like Abbeyhill and Mountcastle; being in east Edinburgh these areas have no obvious connection with the Southside. However the postcode effectively takes in the area surrounding Holyrood Park.
EH9
EDINBURGH
The inner city, Marchmont and Grange, Blackford and around Minto Street, including Causewayside.