The circle representing a certain MMSA falls outside the geographic boundary of its namesake city. Why is this?
Some MMSAs are geographically large, comprising many cities and counties. The circle representing an MMSA on the map is placed at the MMSAs geographic center, or centroid, occasionally placing the circle outside the actual city for which the MMSA is named. For example, the circle representing the Washington-Arlington-Alexandria, DC-VA-MD-WV MMSA is not located in the map for the District of Columbia, but is located in northern Virginia, because that is the centroid of this statistical area. Additionally, because the Washington-Arlington-Alexandria, DC-VA-MD-WV MMSA encompasses a different and larger area than the actual boundaries of the District itself, the prevalence data for the metropolitan division and the district itself will be different.
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