|— Town —|
|• Total||17.93 km2 (6.92 sq mi)|
|Population (September 1, 2007)|
|• Density||2,292.14/km2 (5,936.6/sq mi)|
|Time zone||Japan Standard Time (UTC+9)|
|- Tree||Zelkova serrata|
|- Flower||Tulip, Salvia splendens|
|Address||55-1 Hinode, Ōizumi-machi, Gunma-ken
|Website||Town of Ōizumi|
In 1957, the towns of Ookawa-mura and Koizumi-machi merged, thus "Ooizumi-machi" was born.
Ooizumi's name comes from the 'Oo' from Ookawa and 'izumi' from Koizumi.
10% of the total population are foreign residents, mostly Japanese Brazilians, who work at many factories in the town. Since 1990, Japanese descendants in foreign countries have been permitted to stay in Japan freely. It is estimated that 15% of the population speaks Portuguese as their native language.
Surrounding municipalities 
Places of note 
- Koizumi Castle trace(小泉城跡)
- Ryusenji temple(竜泉寺)
- Koizumi shrine(小泉神社)
- Ainohara remain(間之原遺跡) of Jōmon period (3500 BC-3000 BC)
Media related to Ōizumi, Gunma at Wikimedia Commons
- Oizumi official website (Japanese)
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