[1] It was located on the Southern Pacific Railroad 10.5 miles (17 km) northwest of Los Banos,[2] at an elevation of 92 feet (28 m).

[2] The name was probably from the 1842 German play Ingomar, the Barbarian by Baron Eligius Franz Joseph von Münch-Bellinghausen, a popular work in the dramatic canon in the late 19th century.

[2] A school was established at Ingomar in 1884, and the town was surveyed when the railroad was built through the area in 1889.

The economy was centered on farming and dairying; in the early 1910s there was a school, blacksmith shop, general store, cream-shipping depot, and housing facility for railroad work crews.

The town declined due to the closure of the post office and fouling of the water; only foundations remained as of 2009.