Dreetz is a municipality in the Ostprignitz-Ruppin district, in Brandenburg, Germany.

From 1815 to 1945, Dreetz was part of the Prussian Province of Brandenburg. From 1952 to 1990, it was part of the Bezirk Potsdam of East Germany.

Dreetz: Population development
within the current boundaries (2013)

Year Pop. ±% p.a. 1875 2,447 —     1890 2,276 −0.48% 1910 1,951 −0.77% 1925 1,871 −0.28% 1933 1,879 +0.05% 1939 2,034 +1.33% 1946 2,566 +3.37% 1950 2,630 +0.62% 1964 2,036 −1.81% 1971 1,883 −1.11% 1981 1,530 −2.05% 1985 1,504 −0.43% 1989 1,447 −0.96% 1990 1,396 −3.52% 1991 1,353 −3.08% 1992 1,328 −1.85% 1993 1,310 −1.36% 1994 1,310 +0.00% 1995 1,297 −0.99% 1996 1,286 −0.85%

Year Pop. ±% p.a. 1997 1,284 −0.16% 1998 1,292 +0.62% 1999 1,284 −0.62% 2000 1,278 −0.47% 2001 1,263 −1.17% 2002 1,256 −0.55% 2003 1,254 −0.16% 2004 1,261 +0.56% 2005 1,261 +0.00% 2006 1,240 −1.67% 2007 1,226 −1.13% 2008 1,225 −0.08% 2009 1,230 +0.41% 2010 1,206 −1.95% 2011 1,147 −4.89% 2012 1,157 +0.87% 2013 1,162 +0.43% 2014 1,153 −0.77% 2015 1,157 +0.35% 2016 1,147 −0.86%