Below is an example of what data is now out there for small geographies. It is a map showing the block groups for Herkimer County, highlighting those that have significantly higher or lower median household incomes when compared to the county as a whole. Note that some of the areas are hatched - this is done in order to let the viewer know that the margin of error for that particular small area is quite high (generally higher than 30% of the estimate). When margins of error are high for an estimate, it is important to view that data with some caution. It doesn't mean you should discount the information, but you need to view it as being statistically, well, fuzzy at best !
Click on the map to enlarge it.
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