Illinois - Average Distance to Nearest Airport

This page presents statistics and a map.
See information on how and why they were computed.

24.40 mi. = mean distance of a person to his or her nearest major airport
Percent of population within a given distance of a major airport:
PercentileDistance (mi.)
10th percentile5.16
25th percentile8.38
50th percentile (median)15.87
75th percentile32.94
90th percentile60.03

This map displays the major airports in and around Illinois. It shows how the state can divided according to which airport is the closest as the crow flies.

The flags are a sample of 500 census tracts (of 3,115 tracts total) within the state.

On the above map, some census tract flags may look like they are colored for one airport's region but are actually in another airport's region. The census tract flags are colored with which airport they are closest to as the crow flies along the surface of the earth (the Haversine distance formula). The region boundaries that are displayed on map were computed assuming assuming the earth is flat. (The lines that divide regions are a Voronoi diagram, and I couldn't find any algorithm that calculate the lines on a sphere such as the earth.) In short, although a few census tracts may look like they're mislabeled near a boundary, it's actually the boundary that is slightly wrong.

12,830,632 = total population of Illinois
Table of most useful airports: (i.e., the airports that are the closest major airport for the most people)
Airport Code Number of People for whom this is their closest airport
Chicago O'Hare International AirportORD4,663,093
Chicago Midway International AirportMDW4,226,352
Lambert-St. Louis International AirportSTL1,046,824
Central Illinois Regional Airport at Bloomington-NormalBMI966,596
General Wayne A. Downing Peoria International Airport (was Greater Peoria Regional Airport)PIA732,124
Quad City International AirportMLI429,531
Evansville Regional AirportEVV428,229
Dane County Regional Airport (Truax Field)MSN262,431
Indianapolis International AirportIND40,685
General Mitchell International AirportMKE29,648
The Eastern Iowa AirportCID5,119


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Thanks for the Maps Icons Collection for the icons used in the embedded map image above.
© Mark Pearson 2012