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|Criterion||Census 2000 Criteria||Final 2010 Census Criteria|
|Levels of PUMA geography||Two levels of PUMA geography corresponded to the two types of PUMS files available (1-percent super-PUMA and 5-percent standard PUMA)||One level of PUMA geography corresponds to the one type of decennial and ACS PUMS available|
|PUMA minimum population threshold||100,000 persons||Each PUMA must contain a minimum population of 100,000 persons at the time of delineation. To assure ongoing publication of ACS PUMS and estimates, PUMA population should remain above 100,000 throughout the decade.|
|PUMA-county part minimum threshold||Not a requirement||Each single PUMA-county part meets a minimum population threshold of 2,400 persons (i.e., the Census 2010 minimum population threshold for a census tract (1,200) x2)|
|PUMA geographic "building block" entities||Counties or equivalent entitites, census tracts, incorporated places with populations of 100,000 persons or greater, and county subdivisions (minor civil divisions) in the 6 New England states||Counties or equivalent entities and census tracts only|
|PUMA names (guideline)||Not a requirement||*NEW - Names will be applied to PUMA areas and regions for local identification as designated by participants. Note: The provision of names is optional, and not a criterion/requirement|