Hi! I just got this from the 1851 census for Northamptonshire:
Alfred 3 born Helmdon Benjamin 45 born Helmdon George S. 18 born St Pancras MDX Hannah M, age 43 born Stowe BKM John B. 11 born Helmdon Sarah A. 8 born Helmdon Susanna 6 born Helmdon Thomas 5 mths born Byfield William 13 born St Pancras MDX
And I wonder what Stowe BKM and St Pancras MDX is. I suppose they are churches, but in which city? And what does BKM and MDX mean?
They are BS 6879:1987 county codes, which are almost identical to the Chapman County Codes.
I've put a full list of The Chapman County Codes in the "Common Room"
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Searching for Coleman, Moore, Kallnung in London; Margulies, Remenyi in E. Europe; Ancestors of Hessie Stevenson-Coleman-Baxter (Ireland, 1861) and, of course, any other ancestors for my web-site.
Most registers for the churches have been deposited at London Metropolitan Archives. I haven't come across any for St. Pancras online - unless they are very well buried somewhere.