Siheung's current area formerly belonged to Incheon and Ansan before 1914. Notable landmarks include the Oido island, the Soraesan mountain, Lotus theme park and the port and inlet of Wolgot.

[clarification needed] Companies headquartered there include Hansung Machinery Co., Korea Polytechnic University (established in 1997), and also Kyonggi Institute of Technology [ko] (reorganized in 1999).

[2] In February 2010, Seoul National University acquired 826 thousand square-meters or 204 acres of Siheung property to establish its global campus.

[3] The university plans to build a biomedical complex, research hospital, apartments, and education-related infrastructure including lecture halls, dormitories, and an international middle and high school.

The Seohae Line was added on June 16, 2018, and will be built to run through the city from the Sosa station to Ansan.

Quaternary industries provided the following: wholesale and retail trade (6.6%); construction (4.0%); real estate and leasing (3.3%), and business services (3.2%).

In the tertiary industry, the proportion of housing and food and lodging (7.6%), education (5.2%), and health and social services (4.4%).

Overseas Visit Experience program in which children receive prior education through various subjects such as culture and art, history and embark on field trips.

The biggest feature is that low-income families who are unable to get a chance to visit overseas due to financial difficulties are given opportunities to participate in international exchange activities.