This creator of this map acknowledges that it may be inaccurate in the following way(s): Approximation of historic boundaries from modern ones, see detailed list below.

DescriptionDevon UK districts 1974 from BL.svg	An approximate map of the districts of Devon in 1974, immediately prior to the 1974 reorganisation. See below for detailed list of errors. Colours:   County Borough   Municipal Borough   Urban District   Rural District
Date	12 October 2010
Source	Ordnance Survey OpenData. Most data from Boundary-Line product. Lake data from Meridian 2 product. Inset derived from File:England location map.svg by Spischot.
Author	Nilfanion, created using Ordnance Survey data
Permission (Reusing this file)	This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. Attribution: Contains Ordnance Survey data © Crown copyright and database right You are free: to share – to copy, distribute and transmit the work to remix – to adapt the work Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original. https://creativecommons.org/licenses/by-sa/3.0CC BY-SA 3.0 Creative Commons Attribution-Share Alike 3.0 truetrue

The map is based upon the modern Civil Parishes. Some parishes have had significant alterations in the past 40 years. The more obvious examples are annotated on the map. Some of these are quite subtle, but still visible as this scale.

Most serious of these are in South Molton RD and adjacent districts - Brayford consisted of two parishes in 1974, and South Molton's parish boundary has changed quite recently. Compare to these boundary maps from 1944: North^{[dead link]} and South^{[dead link]}.

In addition the lakes/coastline data is incorrect in places. For example, Roadford reservoir was constructed in 1989.