It is located about 32 km to the west of Kuala Lumpur and 6 km east of Port Klang. It was the civil capital of Selangor in an earlier era prior to the emergence of Kuala Lumpur and the current capital, Shah Alam. Port Klang, which is located in the Klang District, is the 13th busiest transshipment port and the 16th busiest container port in the world.
Klang is served by five commuter stations that constitute the Batu Caves-Port Klang Route of the KTM Komuter system, namely the Bukit Badak Komuter station, the Kampung Raja Uda Komuter station, the Klang Komuter station, the Teluk Pulai Komuter station and the Teluk Gadong Komuter station.

Klang is well connected to the rest of the Klang Valley via the Federal Highway, the New Klang Valley Expressway, South Klang Valley Expressway, the North Klang Straits Bypass (New North Klang Straits Bypass) as well as the KESAS Highway.

Klang is also served by the RapidKL bus route. Klang Sentral acts as a terminal for buses and taxis in northern Klang.