Sukhumvit Road begins in Bangkok, as a continuation of Rama I and Phloen Chit Roads which span Pathum Wan District. Starting from where the boundaries of the districts of Khlong Toei, Pathum Wan and Watthana meet, it runs the entire length of the border between Khlong Toei and Watthana, then passes through Phra Khanong and Bang Na districts.
In the capital, Sukhumvit Road serves as a main commercial street, and this section is often congested, even at late evening or early morning hours. The Chalerm Maha Nakhon Expressway has an exit at Soi 1. Ratchadaphisek Road crosses Sukhumvit at the Asok (Asoke) intersection.
The Sukhumvit area of Bangkok is easily accessible on the Sukhumvit line of the BTS Skytrain, which runs from Khu Khot in Lam Luk Ka, Pathum Thani through the Silom Line interchange at Siam up to Kheha in the centre of Samut Prakan province. The MRT's Sukhumvit Station interchanges with the Skytrain at Asok. The Eastern portion of the Sukhumvit Line is built on top of Sukhumvit Road (including Rama I and Phloen Chit Roads) from Siam to Kheha station.
The Sois are numbered from west to east, with odd numbers branching off north-east of Sukhumvit, and even numbers branching off south-west.
The area between Sukhumvit Soi 1 and Sukhumvit Soi 63 is popular as residential area for western expatriates. Japanese nationals tend to prefer from Soi 21 Asok intersection upwards, especially Soi Thong Lo. Rentals tend to be higher in the even numbered streets between Soi 8 and Soi 28 and in the odd numbered streets between Soi 15 and Soi 39. Soi 12 is occupied mainly by Indian expatriates. The beginning of Soi 12 also has a Koreatown with several Korean restaurants and grocery stores. Koreatown is across the road from the Korean Cultural Centre.
Major sois off Sukhumvit Road in Bangkok and other parts:
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Opposite to Soi 4 Nana Tai (South Nana). Has a popular nightlife and red light district, Arab neighborhood, and a major international hospital (Bumrungrad International Hospital)
11
Chai Yot
Red-light district as the extension of Nana entertainment complex, also shortcut to neighbouring Sukhumvit Soi 13 (Saeng Chan)
Part of the Ratchadaphisek (Silver Jubilee) inner ring road. Has both BTS (skytrain) and MRT stations (subway stations). Terminal 21 mall is a major highlight. Close to Benjakitti Park and home to many corporate offices. Asoke is also infamous for its traffic during rush hour
22
Sai Nam Thip
Location of the girls' secondary academy Sai Nam Peung School
Namesake of Soi Ari (Phahonyothin Soi 7) near Saphan Kwai, the hangout place for youngster where the many restaurants and chic cafés are located. Also the location of Ari BTS station
Part of Sukhumvit Road networks of sub-sois & shortcut systems; provides easy access to Rama IV by connecting with Soi San Sabai after Soi Napha Sap 5, Landmarks: Baan Sukhumvit, SakulThai Magazine
39
Phrom Phong
An extension of Sukhumvit Soi 24 or Soi Kasem, the two are often referred to collectively as Soi Phrom Phong. Close to the malls EmQuartier, EmSphere, and Emporium, and Benjasiri Park
40
Ban Kluai Tai
Shortcut to Rama IV Road and location of Bangkok University, City Campus
Booming up-market residential and commercial strip; location of Pridi Banomyong Institute. Historically been a Japanese neighborhood, which extends into Phrom Phong.
62
Exit from and access to Chaloem Mahanakhon Expressway towards Din Daeng or Dao Khanong via Tha Ruea