In 1895, rancher S.G. Umbarger leased the site from the Houston and Great Northern Railroad survey lands.
In 1902, a group of German Catholics from the Schulenburg area in south central Texas settled in Umbarger.
A general store that housed a post office opened soon after, followed by the creation of a public school district in 1904.
[3] Around the same time a Catholic missionary, Father Joseph Reisdorff, worked to attract other German families to the community.
In 1908, both he and John Hutson, an Englishman who had speculated in land holdings around Umbarger, filed separate plans of settlement.
By that time, the business district was centered in Reisdorff's portion of Umbarger on the north side of the railroad tracks.
Although it remains unincorporated, Umbarger is home to over 300 residents, several businesses, and a functioning post office (zip code: 79091).