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Micro-urban areas fall between " micropolitan " , which was introduced by the United States Census Bureau in 2003 to refer to areas with populations of 10,000-49 ,999 , and larger areas designated as " urban " or " metropolitan " .
 United States Census Bureau
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 United States Census Bureau