Holly is a Statutory Town in Prowers County, Colorado, United States, near the Kansas border. Located four miles (6 km) from the Kansas border at an elevation of , Holly is both the easternmost and the lowest town in Colorado. The population was 1,048 at the 2000 census.
According to the United States Census Bureau, the town has a total area of 0.8 square miles (1.9 km²), all of it land.
There were 369 households out of which 39.0% had children under the age of 18 living with them, 54.5% were married couples living together, 8.7% had a female householder with no husband present, and 32.0% were non-families. 27.9% of all households were made up of individuals and 16.3% had someone living alone who was 65 years of age or older. The average household size was 2.71 and the average family size was 3.36.
In the town the population was spread out with 32.0% under the age of 18, 8.4% from 18 to 24, 24.0% from 25 to 44, 19.8% from 45 to 64, and 15.8% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 103.1 males. For every 100 females age 18 and over, there were 91.2 males.
The median income for a household in the town was $24,917, and the median income for a family was $31,979. Males had a median income of $23,000 versus $21,250 for females. The per capita income for the town was $14,246. About 21.7% of families and 27.9% of the population were below the poverty line, including 37.5% of those under age 18 and 20.7% of those age 65 or over.
The ranch changed hands in 1883 when Mr. Holly and his partners sold it to an English Company under the name of the Arkansas Land and Cattle Company. The ranch eventually grew to be one of the largest cattle ranches in the West, encompassing nearly of land.
Back in the early days, ranch headquarters acted as community centers, not only for those employed at the ranch, but also for neighboring homesteads. The centers not only provided many services, but in many cases, sold supplies and food. The SS Ranch was one of these community centers, or service centers, that grew to be the small town of Holly. The ranch house and barn are still standing in Holly.
On March 28, 2007, an EF3 tornado struck the city. Many of the houses in Holly, and some outside of town, were completely demolished. 29-year-old Holly resident Rosemary Rosales was killed as a result of injuries she sustained during the tornado. 76 year-old Delores Burns later died from her injuries one month after. Homes in Holly sustained considerable damage. Approximately 160 homes suffered at least some damage with 50 homes ruled unfit to live in. State Farm Insurance estimated their company alone would have to pay out more than $2,000,000 in claims.