With only 21 States currently available, it looks like there is a 15% increase in the number of Census Tracts (from 2000/2004 to Census 2010). Generally, “inner city” census tracts, and rural census tracts, remain unchanged, while the additional tracts come from spliting suburban census tracts (almost all population changes from 2000-to-2010 are “increases in suburban areas”).
Having said that, the City of Elizabeth, NJ shows both combining and spliting of Census Tracts (Census 2000 census tracts have yellow boundaries and labels with Times New Roman font; Census 2010 census tracts have thin black boundaries and labels with Arial font):
Elizabeth, NJ had 24 Census Tract in 2000, and 26 Census Tracts in 2010. This is only a “net increase” of 2 Census Tracts, but 4 tracts were split into 8, 4 tracts were combined into 2, and 16 tracts were not changed.
The map below shows an interesting transition. In Iredell County, North Carolina (just north of Charlotte, NC), tract 616 split into 2 tracts, tract 615 split into 3 tracts, and tract 614 split into 8 tracts:
On my website, I have sliders illustrating 1990-to-2000 census tract transitions:
http://dixonspatialconsulting.com/Flex3projects/Fade_1990_to_2000/bin-release/Fade_1990_to_2000.html#
I look forward to posting some interesting areas for the 2000-to-2010 transitions.
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