1957 Map of Derby

This era captures the northward expansion of residential suburbs like Thornton and Western Hills, contrasting with the established agricultural and water management systems seen at the State Game and Fish Hatchery and along the Niver Canal Extension. Numerous local institutions are mapped in detail, from the Riverside Cemetery and Rose Hill Cem to the sprawling Air Force Accounting & Finance Center, documenting the rapid transformation of Adams County from rural plains to an integrated urban industrial hub.