Exurb

[3] Exurbs consist of "agglomerations of housing and jobs outside the municipal boundaries of a primary city"[4] and beyond the surrounding suburbs.

[5] The word exurb (a portmanteau of extra (outside) and urban) was coined by Auguste Comte Spectorsky, in his 1955 book The Exurbanites, to describe the ring of prosperous communities beyond the suburbs, that are commuter towns for an urban area.

[6] In other uses the term has expanded to include popular extraurban districts which nonetheless may have poor transportation and underdeveloped economies due to their distance from the urban center.

[11] To qualify as exurban, a census tract must meet three criteria:[11] These are based on published datasets.

Alternative approaches include working with Oak Ridge National Laboratory LandScan data and GIS.