Hazleton is a city in Buchanan County, Iowa, United States. The population was 823 at the 2010 census.
The original town was established in 1853 when E. W. Tenney opened a store. A post office opened soon after and was named "Hazelton", because the community was in a hazelnut grove. When the railway came, it missed the town by a mile, so the town was moved to the railway. The current site of "Hazleton" was established in 1873, and incorporated in 1883.
Hazleton is located at 42°37′6″N 91°54′24″W (42.618317, -91.906646).
According to the United States Census Bureau, the city has a total area of 0.79 square miles (2.05 km2), of which 0.75 square miles (1.94 km2) is land and 0.04 square miles (0.10 km2) is water.
As of the census of 2010, there were 823 people, 354 households, and 207 families living in the city. The population density was 1,097.3 inhabitants per square mile (423.7/km2). There were 402 housing units at an average density of 536.0 per square mile (207.0/km2). The racial makeup of the city was 96.8% White, 0.5% African American, 1.6% Native American, and 1.1% from two or more races. Hispanic or Latino of any race were 1.6% of the population.