For research, we are using county-level data for fatal car accidents. However, this data is very sparse for counties with small populations. I would like to know if there is a guideline for merging (aggregating) data of counties with small populations.

In other words, is there any unit of analysis that is finer than states but larger than counties with a considerable population?

  • What is the connection of this question to Open Data? You may want to go to the Data Science stackexchange with the question of how to aggregate sparse data.
    – user6083
    Mar 17, 2016 at 9:25
  • 2
    This question is better placed on teh Data Science stackexchange
    – user6083
    Mar 17, 2016 at 9:26
  • 1
    if this is county produced or census data, its open data.
    – albert
    Mar 17, 2016 at 15:24

1 Answer 1


Census has Metropolitan and Micropolitan Statistical Areas
as well as Combined Statistical Areas (CSA):
and CBSA (Core Based Statistical Areas):

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