|• Mayor||Erik Homann (CDU)|
|• Total||102.13 km2 (39.43 sq mi)|
|Elevation||205 m (673 ft)|
|• Density||190/km2 (490/sq mi)|
|Time zone||UTC+01:00 (CET)|
|• Summer (DST)||UTC+02:00 (CEST)|
The Saxon settlement of Sehusa was first mentioned in a 974 deed issued by Emperor Otto II and Chancellor Willigis, from 1235 on it belonged to the Welf dukes of Brunswick-Lüneburg who had a castle erected. In 1428 Seesen received town privileges by Duke Otto II the One-Eyed of Brunswick-Göttingen. On 17 July 1810, Israel Jacobson dedicated in Seesen the first synagogue which employed an organ and a choir during prayer and introduced some German liturgy. This day is celebrated by Reform Judaism worldwide as its foundation date. In 1836 Heinrich Engelhard Steinweg (later named Henry E. Steinway) built his first grand piano in his kitchen in Seesen; the instrument is today on display at New York's Metropolitan Museum of Art.
Seats in the municipal assembly (Stadtrat) as of 2006 elections:
- Christian Democratic Union (CDU): 17
- Social Democratic Party of Germany (SPD): 15
- Free Democratic Party (FDP): 2
Seesen is twinned with:
- Wantage, United Kingdom (since 1978)
- Thale, Germany (since 1990)
- Carpentras, France (since 1993)
- Montecorvino Rovella, Italy (since 2006)
- The composer Louis Spohr (1784 – 1859) spent his childhood at Seesen.
- In 1801 the merchant Israel Jacobson (1768 – 1828) established the first Haskalah interdenominational school in Germany at Seesen.
- The piano manufacturer William Steinway was born at Seesen on 5 March 1835 as Wilhelm Steinweg. His father Henry E. Steinway (Heinrich Engelhard Steinweg) built his first grand piano at a Seesen washkitchen in 1836.
- Emil Wohlwill (1835 – 1912), chemist, born at Seesen.
- The caricaturist Wilhelm Busch (1832 – 1908) spent his last years at the Mechtshausen vicarage.
- Konstantin Bernhard von Voigts-Rhetz (1809-1877), Prussian general, born in Seesen
- Wilhelm Fitzenhagen (1848-1890), cellist, composer and university teacher, born in Seesen
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