Maps and mapping

Ordnance Survey Maps for Local History Research

This is a companion piece to the article Old Maps for Local History Research, which talked about pre-Ordnance Survey maps.

Beginning Map Research

Maps are an amazing way to research local history. Start with a recent map, and then look at increasingly older editions. Immediately you can see in reverse the changes which have happened over time. You start with something very familiar, and gradually work your way back. Sometimes, an unbelievable amount has changed in very little time.

But whether you are researching Liverpool, or another city or any rural area of Britain, you’ll need to know what maps have been made of your location, and when they were made. Luckily, in this day and age it’s not hard to find them.

For every local historian, the first port of call must be the Ordnance Survey maps. You can pick up the current version for around £8, or a recent second hand copy off eBay for a fiver. Get a 1:25,000 Explorer map – these show individual buildings but cover enough area (unless you’re really unlucky!) for your needs. Even Amazon sell the Ordnance Survey Liverpool sheet these days.

That’s the easy part!

Now you have your anchor, your reference point for all the other maps you’ll be looking at. This serves as the base for your next step, which is known by the professionals as ‘map regression‘. This just means that you collect as many maps as possible, and work your way back through them and noting the changes.

Getting a recent map of your area should be easy enough, but slightly older ones are going to be second hand. You need to be aware of where to get them.

Second-hand and online maps


Your first choice for buying paper maps has to be eBay. I’ve bought almost all of my OS maps from this site, each for about the price of a pint of beer. eBay seems to be strongest with the years between 1930 and 2000, particularly 1950 – 1980.

OS maps from across this period repeatedly appear for a couple of pounds. Keep an eye on this site so you’re ready when the right map appears. You’d also do well to keep an eye on what you’ve already bought. More than once I’ve nearly ended up with two maps from the same year!

The list I have for Liverpool includes: 1947, 1952 (last revision 1947-9); 1961 (last revision 1958), 1964, 1978 and 2000. (For an excellent overview and samples of all the OS map series, see

Older OS maps are a bit harder to find (see below), although occasionally a great find pops up on eBay. Luckily, there are ways you can get a look at OS maps without leaving the comfort of your own home. There are a couple of web sites which let you view old OS maps, and some of these are very nifty mapping sites in their own right.

Commercial map sellers

Getting maps off eBay, and viewing maps online are the cheapest ways to get the most common editions. The following sites will sell you brand new reproductions of old maps, including difficult-to-find early editions.

Alan Godfrey Maps

This site publishes a huge list of maps of Liverpool and elsewhere. They’re paperback maps about A3 size, and extremely detailed (though that means they cover a small area). There’s an odd lack of illustration on the site, probably due to its age and the huge number of products on there. However, the maps are an unparalleled resource, and are also sold all the time on eBay.

Cassini Maps

Cassini are a large commercial map company, slightly reminiscent of the National Archives web site. The company sells highly polished map products of all types. You can get downloadable or printed maps, and specify the area and period you want. There’s also a boxed set of maps of Liverpool, which comes in useful for the wide-ranging form of map exploring!

David Archer Maps

The David Archer site is one that once looked like it was closing down, but now has greatly improved, and is easy to navigate to the maps you want. Try their books, or their small and large scale maps pages, for instance, which give a good summary of the years the map editions were published.

Take a look at the informal blog “A nice cup of tea and a chat about maps” (now only available via the Wayback Machine on the Internet Archive). It’s quite a rambling but entertaining diversion into other map sites, Christmas cards and exhibitions. It also reveals that David’s a fan of free and open source software, which always gets the thumbs up from me!

Despite their closure, if you know what you want then you can contact them. They won’t carry out research, but their boundless knowledge might mean they can fire off an email to help you on your way.

Last Words

This has been a fairly brief overview of map sources. There are many more online, but these are the few I keep going back to. When you’re ready for the next step, you can read my guide to Old Maps, which are often a lot harder to find.

Of course, if you know of better places to get hold of old maps, share it in the comments!

Image: SJ49SW – A, Surveyed / Revised: 1950 to 1963, Published: 1965, reproduced with permission of the National Library of Scotland.

4 Comments on “Ordnance Survey Maps for Local History Research”

  • Hi Martin,

    I love your blog! It’s been immensely helpful in my research into my ancestors who lived in Liverpool during the 1840s and 50s. I do have a question, though, if you don’t mind…I’ll be visiting Liverpool in October and I’d like to see the place where my ancestors lived. In the 1841 census, they were on “Front Portland Street.” Using one of the maps on your site, I found “Back Portland Street.” I assume “Front” is just…the front of the street?? In the 1851 census, the family is living at 3 Albert Terrace. I believe this was a tenement building near Portland Street. Do you know anything about Albert Terrace or where I can find more information on the tenements in that area? An ordnance map would be splendid, but I’m having trouble finding one, so I thought I’d ask the expert…any help would be greatly appreciated! Thank you so much.


    • Hi Susan,

      I think you’re right – Front Portland Street is just ‘Portland Street’! It’s hard to find information on specific Terraces, but they could well be a portion of the street itself. There’s a decent map here, but you’ll need to subscribe to their service to zoom in more than this:

      I hope this gets you in the right direction.



    • Steve Hargreaves


      Susan, I also had relatives in Albert Terrace (in 1871) and have not been able to accurately locate it. But, on the 1871 census, the surrounding addresses all appear to be in a ‘square’ boundaried by Hopwood Street, Hook Street, Latimer Street and Sumner Street. My map is post 1871 and there are many empty plots probably due to war damage.


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