population

Maps make boring statistics come alive!

I created the following maps using ArcMap (a commercial GIS program) and freely available downloaded Census data. It's not the sort of thing that anyone can do - ArcMap is a relatively involved program and combing through the Summary File data requires moderately advanced Microsoft Access skills.

With a little bit of invested time in learning the system, however, the American Fact Finder website can help the lay person create custom maps from the same data using only a web browser!

The following maps are available for download in pdf form at the bottom of this article.

Note that the map above is total population not population density. The large census tracts have a high total population spread out over a much larger area.

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On August 11, 2011, the Census Bureau released the Iowa SF1 (summary File 1) data to the public. Being the obnoxious data hound that I am, I can't resist playing around with this information to see what jumps out... In this first installment, I'm going to take a look at the statewide data aggregated to the Street Crowd (historic): This image is in the public domain, via Wikimedia CommonsStreet Crowd (historic): This image is in the public domain, via Wikimedia Commons"place" level - identified towns and cities. Rural residents who don't live in an incorporated town or city are not included in these numbers.

You can check out Des Moines' stats below the break.

Iowa's total population is 3,046,055 people

Of that, 2,421,895 (79.5%) have chosen to live in an incorporated town or city. There are 1,009 incorporated towns and cities identified by the Census bureau for reporting purposes. However, 140 of those towns have fewer than 100 residents.

The average population of an incorporated city in Iowa is 2,400 residents. The top quintile (highest 20% by population) averages 10,334 residents. By a factor of 1.6, more people choose to live in Des Moines than the next most populated city, Cedar Rapids.

The Top 10 Iowa Cities by total population are:

    City Population
    Des Moines 203433
    Cedar Rapids 126326
    Davenport 99685
    Sioux City 82684
    Waterloo 68406
    Iowa City 67862
    Council Bluffs 62230
    Ames 58965
    Dubuque 57637
    West Des Moines 56609

Despite having the fastest growing suburbs in the state, only one of the Des Moines area suburbs makes the top 10 in total population. In fact, only one of the top 10 most populated cities in Iowa is a suburb.

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The Census Bureau releases annual population estimates by City. The most recent (2009) estimates were released last week.

I pulled statistics for the Des Moines metro area and created a couple graphs to show trends over time. Here are the top five things I noticed in these graphs:

1 - The City of Des Moines has clearly turned a corner

Like many central cities that have experienced declines in population, the City of Des Moines is is now gaining population in absolute numbers. This is good for the City and good for the region.

Des Moines MSA Population Trend by CityDes Moines MSA Population Trend by City

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In an article published on July 10, 2008, the Des Moines Register claims that "More Iowans like suburban life". The article is based on updated Census estimates for 2007. In fact, an examination of the underlying data leads me to the opposite conclusion: More Iowans actually prefer living in central cities and towns.

Here are some reasons why.

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