High Quality Content by WIKIPEDIA articles! Holcomb is a city in Finney County, Kansas, United States. The population was 2,026 at the 2000 census. Holcomb is known for the murders of the Herbert W Clutter family, which formed the basis of the Truman Capote novel In Cold Blood.As of the census of 2000, there were 2,026 people, 592 households, and 515 families residing in the city. The population density was 1,730.1 people per square mile. There were 608 housing units at an average density of 519.2/sq mi. The racial makeup of the city was 80.80% White, 1.09% African American, 0.89% Native American, 0.30% Asian, 13.28% from other races, and 3.65% from two or more races. Hispanic or Latino of any race were 24.43% of the population.