Neighboring districts are (from north clockwise) Bang Phlat, Phra Nakhon (across Chao Phraya River), Bangkok Yai, Phasi Charoen, and Taling Chan.

On 12 December 1991 a small part of Bang Phlat district was moved back to Bangkok Noi, creating the new Arun Ammarin sub-district.

The slogan of the district is Resonant Wat Rakang, historical Wang Lang, Royal barges and railway are renowned, lively khlong, inherited stone-polished bowl, Buddha image cast, and abundant ancient wats.

The missing number 1, 2, 3 and 8 belong to the sub-districts which were split off to form Bang Phlat district.

Wat Rakhang Khositaram Woramaha Wihan is a major temple by the Chao Phraya river.

In the Soi Charan Sanit Wong 34 (Charan Sanit Wong 34 Alley) in the area of Arun Amarin, it is the location of Petchyindee Academy the famous and popular fitness club and Muay Thai institute.

The multiplex cinema, which is actually in Bang Phlat District, is surrounded by many small shops selling low-cost clothes and other fashion items.

Supermarkets in the district include a Foodland and a Makro store, both on Charan Sanit Wong Road.

The district is served by the Fai Chai and Bang Khun Non Stations of the MRT Metro, whose Blue Line runs above Charan Sanit Wong Road.

Moreover Bangkok Noi is also referred to in the masterpiece tragedy novel Thommayanti's Khu Kam (คู่กรรม) as the backdrop of the whole story, because it is the location of the Imperial Japanese Army base during World War II period.

This novel has been adapted into TV drama, stage plays and movie many times, such as Sunset at Chaophraya in 1996 lead role by superstar Thongchai "Bird" McIntyre etc.