This town is located on the west bank of the Saint John River at the mouth of the Oromocto River, approximately 20 kilometres southeast of Fredericton. The town's name is derived from the name of the Oromocto River; "oromocto" is thought to have originated from the Maliseet word wel-a-mook-took which means "deep water".

It is the administrative headquarters of the Oromocto First Nation band government.

The village was initially an Acadian village. During the Expulsion of the Acadians, the village was burned in the St. John River Campaign (1758). During the American Revolution, Fort Hughes was built in the community after the rebellion at Maugerville, New Brunswick. (A replica of Fort Hughes was built at Sir Douglas Hazen Park.) In 1783 Oromocto saw a large influx of settlers with the arrival of United Empire Loyalists, with a steady stream of new blood arriving in the area. Many of the Loyalists also moved into surrounding areas, establishing smaller communities such as Lincoln and Geary. Oromocto was originally a shipbuilding town in the 19th century, but went into decline after the industry closed. During its shipbuilding days, Oromocto produced about 22 ships. This was made possible by a vast abundance of timber and sawmills, which continued to provide economic stability to Oromocto, even after the shipbuilding business had died out. It remained a small hamlet until it was selected as the headquarters for a large military training area, in the early 1950s. The Gagetown Military Camp (Camp Gagetown) opened in 1955 as the largest military reservation in the Commonwealth of Nations at the time.

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