Population of present-day Poland in 1820 - Angus Maddison's data vs. my data

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Angus Maddison in his book "The World Economy: A Millennial Perspective" in part "Appendix B: Growth of World Population, GDP and GDP Per Capita before 1820" gives the population of Poland (within modern borders, between the Oder-Neisse and the Curzon Line) in 1820 as 10,426,000 people:

http://piketty.pse.ens.fr/files/Maddisson2001.pdf#page=233

I started this thread because I want to share my calculations, which produced a very similar result to that of Maddison.

My calculations (based on several different sources) yield the following population number in year 1820:

Posen Province - 908,278
West Prussia - 652,667
Pomerania* - 526,815
Oppeln Regency - 582,584
Lower Silesia* - 1,464,058
Neumark* - 346,327
Warmia - 116,831
Masuria - 246,435
Rest of East Prussia** - 128,052
Western Galicia - 1,353,802
Free City of Cracow - 100,312
Cieszyn Silesia*** - 144,900
Congress Poland**** - 3,520,355
Belostok Oblast - 219,080

*Only areas located to the east of the current Polish-German border.
**Only areas located to the south of the current Polish-Russian border.
***All of it, including the part which currently belongs to Czech Republic.
****All of it, including part of Sudovia which currently belongs to Lithuania.

Total population of regions listed above in year 1820 was - 10,310,496.

However, there are some minor differences here compared to the population of current Poland, because:

1) This number includes the population of part of Congress Poland, which now belongs to Lithuania.
2) This number includes the population of part of Cieszyn Silesia, which now belongs to Czech Republic.
3) This number does not include the population of this part of East Galicia which now belongs to Poland.
4) This number does not include the population of Polish Spis and Orava, and of the Białowieża Forest.

Entire East Galicia in 1820 had a population of 2,406,180. Poland owns around 17% of the territory of former East Galicia. So we can assume, that we need to add ca. 409,000 people (around 17% of the population of East Galicia), which will yield a total of ca. 10,719,500. However, we need to subtract the Lithuanian part of Sudovia (let's say that it was ca. 4% of Congress Poland's population, so 141,000) and the Czech part of Cieszyn Silesia (let's say that it was ca. half of Cieszyn Silesia's population, so ca. 72,500).

After subtracting these numbers we have in total 10,506,000 as the population of Poland in 1820.

Adding also Polish Spis & Orava and Białowieża Forest, there will be maybe twenty thousand more.

To sum up, my detailed calculations differ from Angus Maddison's number by only ca. 80-100,000.

De facto this difference is probably lower than the difference in population between January 1820 and December 1820.

 

[Tomenable]

Actually in 1910 the Polish part of East Galicia had not 17% but 16% of entire population of East Galicia.

So we can project this back to 1820 and there were 385,000 (instead of 409,000) people in this territory.

And in such case we will have a total population of 10,482,000 people within present-day Poland in 1820.