Prior to the release of accurate census records, a population count counted 494 people living in Ullesthorpe in 1801. With the opening of the mill in 1800, this led to a rapid increase in the number of people living within the local area because of the employment opportunities. This led to a population increase of 600 in 1821. However, after the close of the mills in the late 1890s, population figures fell again. When accurate census records were introduced in 1881, it is evident from the graph, that there was a fluctuation in population figures. In 1881, the population was recorded as 523. However, by 1911, the population count had sharply declined to 312, but in recent years, this has been on the increase. The population, based on the 2011 census, indicates 903 people currently live in Ullesthorpe.