|o Total||52.3 km2 (20.2 sq mi)|
|o Density||773.67/km2 (2,003.8/sq mi)|
|Time zone||UTC+7 (ICT)|
Neighbouring districts are (from the north clockwise): Bang Len; the districts Sai Noi, Bang Yai and Bang Kruai of Nonthaburi Province; the district Thawi Watthana of Bangkok, and Sam Phran and Nakhon Chai Si.
The most important building in the district is the Phutthamonthon park, a 40 hectare Buddhist park. The district was named after the park.
One of the three campuses of Mahidol University is also in Salaya.
The district is divided into three subdistricts (tambons), which are further subdivided into 18 villages (mubans). Salaya has township (thesaban tambon) status and covers parts of tambon Salaya. Each of the tambon is administered by a tambon administrative organization (TAO).