Semenyih is a vibrant town and mukim situated in the Hulu Langat District of southeastern Selangor, Malaysia. Approximately 28 kilometers southeast of Kuala Lumpur's city center, it serves as a significant hub within the greater Klang Valley region [1]. The town is characterized by its hilly terrain, featuring several scenic waterfalls that contribute to its natural appeal. Over the past few decades, Semenyih has experienced substantial growth, transitioning from a smaller settlement to a more populated area, partly due to improved accessibility and new developments like the University of Nottingham Malaysia Campus [2]. Its strategic location and evolving infrastructure make it an increasingly attractive area for residents and businesses.

• Semenyih is located in the Hulu Langat District of Selangor, Malaysia [1].
• The town is approximately 28 km (17 mi) southeast of downtown Kuala Lumpur [2].
• As of 2025, the projected population of Semenyih is 100,767 [3].
• The total area of Semenyih is 84.50 km² (32.63 mi²) [4].
• The highest peak nearby is Bukit Arang, standing at 560 meters (1,840 ft) [2].
• Semenyih observes Malaysia Time (MYT), which is UTC+08:00 [5].
• The town's postal code is 43500 [6].

Semenyih operates under the jurisdiction of the Kajang Municipal Council (Majlis Perbandaran Kajang - MPKj), which is the local government authority for the broader Kajang area that includes Semenyih [7]. Malaysia itself functions as a constitutional monarchy with a parliamentary democracy at the federal and state levels [8]. Local governments in Malaysia, unlike federal and state governments, are not elected but appointed by the respective state governments [8]. Semenyih is also represented as a state constituency in the Selangor State Legislative Assembly [9]. The council is responsible for local services, urban planning, and revenue collection through assessment taxes [8].

Semenyih's economy has been influenced by its rapid development and increasing population. Historically, it was a smaller agricultural area, but with the expansion of infrastructure and residential projects, the economy has diversified. The growth of new townships and commercial centers, such as Bandar Sunway Semenyih and Setia Ecohill Walk, indicates a shift towards more urbanized economic activities, including retail and services [2, 10]. The presence of educational institutions like the University of Nottingham Malaysia Campus also contributes to the local economy through employment and student-related spending [2]. While specific economic indicators for Semenyih alone are not readily available, its growth mirrors the general economic expansion seen in the broader Selangor state.

Semenyih benefits from a developing infrastructure network. It is primarily served by Federal Highway 1, a key route connecting it to other major towns and cities. Additionally, Highway 31 links Semenyih to areas like Bangi, Putrajaya, Dengkil, and Banting [2]. The town is also accessible via tolled expressways, including the Kajang-Seremban Expressway (LEKAS) [2]. Public transportation includes shuttle bus services connecting to Kajang MRT/railway station and RapidKL bus services to Stadium Kajang MRT station, improving regional connectivity [2]. Within new townships like Bandar Sunway Semenyih, modern facilities such as clubhouses and commercial areas are being developed to support the growing community [2].