Alamosa and Costilla Counties were the first areas of the state of Colorado to be colonized with recorded history dating back to 1540, the year Coronado explored the Southwest. Alamosa County was created out of northwestern Costilla County

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Websites and links for more Alamosa / Costilla County information:

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Costilla County, CO Official Website
Costilla County (Colorado) Wikipedia
San Luis Valley Recreation Map
Features Nearby
State Road Map