Columbine, Colorado Columbine, Colorado Columbine is a census-designated place (CDP) in Arapahoe and Jefferson counties in the U.S. state of Colorado. Located mostly in Jefferson County, it lies immediately west of Littleton. The population was 24,280 at the 2010 census. Columbine High School, made infamous by the Columbine High School massacre in April 1999, is located in the community. The ZIP codes for the community are 80123 and 80128. Columbine is located on the eastern edge of Jefferson County at (39.587887, -105.069332), with a small portion extending east into Arapahoe County. Columbine is bordered to the east by Littleton and Columbine Valley,
Columbine High School massacre the staircase where the massacre began was in fact their preferred spot to wait for the bombs to go off. On Tuesday morning, April 20, 1999, Harris and Klebold placed two duffel bags each containing propane bombs in the cafeteria, set to explode at approximately 11:17 a.m, during the "A" lunch shift. Propane bombs were also placed in the cafeteria's kitchen. No witness recalled seeing the duffel bags being added to the 400 or so backpacks already in the cafeteria. The security staff at Columbine did not observe the bags being placed in the cafeteria, ostensibly because a custodian was