The Census Bureau has been releasing state population figures over the past several weeks and one means of accessing those figures is through a small, interactive map feature. Clicking through makes for some interesting observations—although not all states are currently available. In this screenshot, one can see an interesting story. Western Pennsylvania is shrinking whereas eastern Pennsylvania is growing. And, perhaps importantly, Philadelphia has perhaps reversed its long-term trend of population decline and saw a 0-5% increase in population while its further suburbs have seen increases in the 5–25% range.
census map feature
If one is not viewing the piece in fullscreen mode, the navigation can be a bit small, especially for small counties. And the counties over which one rolls with the mouse cannot be selected, they are purely rollover functions that display census data from 1960 and the total population as of 2010. I would have liked the ability to select a particular county and then compare it to others by rolling over neighbouring counties. The colour choice, blues and a light, brownish-beige work rather well within the overall blue motif of the site. And by restricting the palette there, one gains the ability to use an altogether different colour, here green, to indicate which counties are rolled over along with differentiating the rollover box from the remainder of the map piece.
I wonder if more could not have done with the ethnic breakdowns on the right. Certainly the overall breakdown is effective, but it appears to lack a summary of sorts. What was the overall change for the state? And on a minor note, the person symbol is downright distracting.
To get to the first state, one clicks on said state from an overall map of the United States. States are blue if they have had their data released, grey otherwise. However, once looking at a state, there is no way back to the overall map as states are chosen from a small button in the upper-right. This works just fine, we are here to look at state data, not for a geography lesson. However, that they use the map at the beginning seems incongruent with the remainder of the experience. I wonder if they could not remove the map at the start, or keep the map but make it more useful. After all, it would be interesting to see the percentage change in the states displayed—the unpublished states could remain grey.
Further below the first map is a second map.
Census map 2
Here, one does have access to the state population change figures. Much of the critique above remains salient here, except the light brown for population loss in the first map is here replaced by a garish and obnoxious orange. An interesting addition is the range of historical data, from the 1910 census through the 2010 census and to see how those population changes affected the apportionment of seats in Congress. Another interesting story that one can glimpse is the ‘filling-in’ of the North American continent. Population density in 1910 was high only in the Northeast, but ever since, the people have spread, concentrating along the coasts and then moving inwards towards the vast centre of the continent.