Indonesia is located at the convergence of three tectonic plates, making it vulnerable to earthquakes and at risk of experiencing liquefaction. Liquefaction is a natural process that happens when a strong earthquake causes the water pressure in the ground to increase, making loose, saturated soil behave like a liquid. Liquefaction occurring in soil layers can lead to a reduction in soil shear strength, thereby increasing foundation settlement. Therefore, this phenomenon must be considered in foundation design to ensure the foundation can still support the loads from the superstructure. This study utilizes soil data from two locations: South Tangerang and Jakarta. Liquefaction analysis was conducted through simulations using the MIDAS GTS NX program with nonlinear time history analysis. The results show that the soil at both locations has liquefaction potential up to depths of 18 m (South Tangerang) and 19 m (Jakarta). In addition, liquefaction can cause an increase in foundation settlement by 103–243% compared to non-liquefied conditions, based on both manual calculations and numerical simulations.