Märkisch-Oderland is a Landkreis (district) in the eastern part of Brandenburg, Germany. Neighboring this district are (from the north clockwise) the district of Barnim, the country of Poland, the district-free city of Frankfurt (Oder), the district of Oder-Spree and the Bundesland of Berlin. The administrative seat is the town of Seelow but the largest town is Strausberg.

The district extends from the outskirts of Berlin in the west to the Oder river and the Polish border in the east. It includes a swampy area along the Oder known as the Oderbruch, about 60 km in length and 17 km in width. The Oderbruch was partially drained and populated in the 18th century. The rest of the district is mainly agricultural land.

The district dates back to the district of Lebus and the district of Oberbarnim, which were both created in 1816. The district of Lebus dates back to the Land Lebus, the region around the town of Lebus. In 1863 Seelow became the seat of the administration of the district of Lebus, and in 1950 the district was renamed to Kreis Seelow. In 1952 the districts were split into three parts, the districts of Bad Freienwalde, Seelow and Strausberg. In 1993 the three parts were merged to form the current district - the new name refers to Northmarch lands at the Oder river.

• 
  Development of Population since 1875 within the Current Boundaries (Blue Line: Population; Dotted Line: Comparison to Population Development of Brandenburg state)
• 
  Recent Population Development and Projections (Population Development before Census 2011 (blue line); Recent Population Development according to the Census in Germany in 2011 (blue bordered line); Official projections for 2005-2030 (yellow line); for 2014-2030 (red line); for 2017-2030 (scarlet line)

Landkreis Märkisch-Oderland: Population development
within the current boundaries (2019)

Year Pop. ±% p.a. 1875 137,225 —     1890 134,950 −0.11% 1910 141,360 +0.23% 1925 157,667 +0.73% 1933 166,664 +0.70% 1939 177,555 +1.06% 1946 176,605 −0.08% 1950 192,609 +2.19% 1964 184,838 −0.29% 1971 186,206 +0.11% 1981 178,519 −0.42% 1985 178,762 +0.03% 1989 176,596 −0.30% 1990 174,356 −1.27% 1991 171,572 −1.60%

Year Pop. ±% p.a. 1992 170,995 −0.34% 1993 169,985 −0.59% 1994 170,631 +0.38% 1995 172,577 +1.14% 1996 175,033 +1.42% 1997 178,958 +2.24% 1998 182,968 +2.24% 1999 186,573 +1.97% 2000 188,277 +0.91% 2001 189,634 +0.72% 2002 190,678 +0.55% 2003 191,729 +0.55% 2004 192,131 +0.21% 2005 192,122 −0.00% 2006 191,998 −0.06%

Year Pop. ±% p.a. 2007 191,640 −0.19% 2008 191,241 −0.21% 2009 191,067 −0.09% 2010 190,502 −0.30% 2011 187,085 −1.79% 2012 186,925 −0.09% 2013 187,668 +0.40% 2014 188,422 +0.40% 2015 190,714 +1.22% 2016 191,685 +0.51% 2017 192,921 +0.64% 2018 194,328 +0.73% 2019 195,751 +0.73%

The coat of arms shows the eagle of Brandenburg in the upper half. The upper half also resembles the coat of arms of the former district of Oberbarnim. In the lower half are two boat-hooks and a star, both taken from the coat of arms of the former district of Seelow. The wavy line in the bottom represents the Oder river.

Amt-free towns	Ämter
Altlandsberg Bad Freienwalde Müncheberg Seelow Strausberg Wriezen Amt-free municipalities Fredersdorf-Vogelsdorf Hoppegarten Letschin Neuenhagen bei Berlin Petershagen-Eggersdorf Rüdersdorf bei Berlin	1. Amt Barnim-Oderbruch [seat: Wriezen] Bliesdorf Neulewin Neutrebbin Oderaue Prötzel Reichenow-Möglin 2. Amt Falkenberg-Höhe Beiersdorf-Freudenberg Falkenberg Heckelberg-Brunow Höhenland 3. Amt Golzow Alt Tucheband Bleyen-Genschmar Golzow Küstriner Vorland Zechin	4. Amt Lebus Lebus Podelzig Reitwein Treplin Zeschdorf 5. Amt Märkische Schweiz Buckow Garzau-Garzin Märkische Höhe Oberbarnim Rehfelde Waldsieversdorf 6. Amt Seelow-Land [seat: Seelow] Falkenhagen Gusow-Platkow Fichtenhöhe Lietzen Lindendorf Neuhardenberg Vierlinden
seat of the Amt; town

• (in German) Märkisch-Oderland official website
• (in German) History and infos about Märkisch-Oderland

52°38′N 14°8′E / 52.633°N 14.133°E / 52.633; 14.133