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Denver Paramedics are contracted to provide the 911 medical services to The City and County of Denver , The City of Glendale , the City of Sheridan , the " Skyline " portion of unincorporated Arapahoe County and Denver International Airport .
 Denver, City and County of Denver, City of Glendale, Denver
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Denver, City and County of Denver, City of Glendale, Denver