Welby is an unincorporated community and a census-designated place (CDP) located in and governed by Adams County, Colorado, United States. The CDP is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area. The population of the Welby CDP was 15,553 at the United States Census 2020.
The community was named after one General Welby, a railroad official.
The Welby CDP has an area of 2,432 acres (9.841 km2), including 60 acres (0.244 km2) of water.
The United States Census Bureau initially defined the Welby CDP for the 1970 United States Census.
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