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Wikipedia says:
Highlands Ranch is an unincorporated community and a Census Designated Place (CDP) located in Douglas County, Colorado, United States. The estimated population was 128,273 in 2007, making Highlands Ranch one of the most populous unincorporated communities in the United States. The Littleton Post Office (ZIP Codes 80126, 80129, 80130, and 80163) serves Highlands Ranch. (...) more....
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