This dataset provides eight feature classes. The base feature class is called Counties_cy and isn't generalized. The weighted centroids feature class is called Counties_cy_cent. The centroids are weighted by the U.S. Block Centroids population distribution. Use the weighted centroids in report aggregation and spatial overlay operations. The Counties_cy and Counties_cy_cent feature classes contain all the attributes. There are six generalized boundaries feature classes and called: Counties_cy_gen2, Counties_cy_gen3, Counties_cy_gen4, Counties_cy_gen5, Counties_cy_gen6 and Counties_cy_gen7. Use the generalized boundaries when creating study areas.