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The majority of maps in the collection were produced as part of an administrative exercise on the part of the Post Office to establish the boundaries for free mail deliveries after the increase of mail circulation in the nineteenth century (see particularly 'Town Maps: England and Wales and 'Town Maps: Ireland').

The Irish town maps were created during the period 1830-1860. This was a time of change in the Irish postal system, as it was amalgamated with Britain's postal service in 1831. In 1843 the British government laid down the principle: 'All places the letters for which exceed one hundred per week should be entitled to a receiving office and a free delivery of letters.' The boundary of free delivery for individual areas within Ireland was decided by the Postmaster General in consultation with Augustus Godby, Secretary to the Irish Post Office. A set of maps was created to show the boundaries decided for the various towns which qualified for free delivery.

This exercise coincided with the survey of Ireland carried out by Ordnance Survey Ireland between 1829 and 1842; consequently, the majority of these maps consist of annotated sections of Ordnance Survey maps.

Some of the maps in POST 21 were produced as part of official government enquiries into Post Office administration; for example there are maps produced as part of or as a result of: 2nd Report of Committee on postage, 1838 (POST 21/142, POST 21/152, POST 21/156); 20th Report of Commissioners of Revenue Enquiry, February 1830 (POST 21/153); 21st Report of Commissioners of Revenue Enquiry, March 1830 (POST 21/53, POST 21/56 and POST 21/57); Fifth Report from Select Committee on the roads from Holyhead to London, July 1817(POST 21/217), Report of Commissioners on the Post Office, 1838 (POST 21/761).

The increase of mail coach transportation in the later eighteenth and early nineteenth centuries necessitated the production of good maps showing postal roads, distances between coach stops and places of interest along the way. There are several such maps in POST 21, including: 'Bowles' Road Directory through England and Wales (1796) (POST 21/159), 'Cary's 6 sheet map of England and Wales with part of Scotland' (1830) (POST 21/770) and 'General map of the Roads of England and Wales engraved for Moggs' improved edition of Paterson's Roads' (1829) (POST 21/173).

Several of the maps in the collection were officially commissioned by the Post Office; of particular note are the GPO (General Post Office) Circulation maps of England and Wales, Ireland and Scotland produced by the cartographer, Edward Stanford; these show the routes and manner of transportation of the mail across the countries. Other examples are the various maps produced by John Cary, who was commissioned by the Postmaster General to organise the survey of turnpike roads in Great Britain, a task involving nine thousand miles of survey. The maps resulting from this work were included in his 'New Itinerary,' first published in 1798; the work was dedicated to the Postmasters General and provided the official measures for all mail coach routes and for the postage due on letters, which until 1840 were charged by distance carried.

After the establishment of Uniform Penny Post in 1840, followed a few months later by the introduction of the prepaid postage stamp, the Penny Black, there was a huge increase in the amount of mail sent. In 1839 there were 76 million letters posted in the United Kingdom; in 1840 after the introduction of the Penny Post there were 168 million. The mail service was opened up more to the general public, particularly after the introduction of pillar boxes to mainland Britain in 1855. These developments necessitated the increasing production of post office directories which included maps showing the location of the numerous district post offices and subsidiary sorting houses; there are several 'Kelly's Post Office Directory' maps of London in the collection.