The station is located beneath Rama IV Road at Sala Daeng Intersection, where Si Lom Road begins, serving one of the city's main business districts.

It has been described as the most challenging to construct of the Blue Line, since it lies beneath the Thai–Japan Bridge that crosses Sala Daeng Intersection, requiring a complex underpinning process to replace the bridge's original foundations.

At a depth reaching 30 metres (98 ft), it is the deepest station in the MRT system, and features the longest escalator in Southeast Asia.

[1] Si Lom station is connected to Sala Daeng BTS station by a covered elevated walkway, and forms one of the three original main links between the MRT and BTS systems.

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