Ziethen is a municipality in the district of Barnim in Brandenburg in Germany.

On 1 February 2002, the municipality of Ziethen was formed by merging the municipalities of Groß-Ziethen and Klein Ziethen.

From 1815 to 1947, Groß-Ziethen and Klein-Ziethen were part of the Prussian Province of Brandenburg, from 1947 to 1952 of the State of Brandenburg, from 1952 to 1990 of the East German Bezirk Frankfurt and since 1990 again of Brandenburg, since 2002 united as the municipality of Ziethen.

Ziethen: Population development
within the current boundaries (2020)

Year Pop. ±% p.a. 1875 1,062 —     1890 961 −0.66% 1910 1,052 +0.45% 1925 983 −0.45% 1933 929 −0.70% 1939 927 −0.04% 1946 1,228 +4.10% 1950 1,192 −0.74% 1964 849 −2.39% 1971 807 −0.72% 1981 588 −3.12% 1985 557 −1.34% 1989 517 −1.85% 1990 493 −4.64% 1991 496 +0.61%

Year Pop. ±% p.a. 1992 487 −1.81% 1993 500 +2.67% 1994 488 −2.40% 1995 493 +1.02% 1996 500 +1.42% 1997 505 +1.00% 1998 517 +2.38% 1999 504 −2.51% 2000 489 −2.98% 2001 485 −0.82% 2002 491 +1.24% 2003 500 +1.83% 2004 486 −2.80% 2005 483 −0.62% 2006 485 +0.41%

Year Pop. ±% p.a. 2007 479 −1.24% 2008 474 −1.04% 2009 485 +2.32% 2010 459 −5.36% 2011 455 −0.87% 2012 470 +3.30% 2013 461 −1.91% 2014 446 −3.25% 2015 449 +0.67% 2016 443 −1.34% 2017 443 +0.00% 2018 450 +1.58% 2019 458 +1.78% 2020 446 −2.62%