How Airports Serve Missouri
Mark Pearson
This map displays the major airports in and around Missouri. 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 1391 tracts total) within the state.
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.
For more information, see the full report:
http://www.mark-pearson.com/airport-distances/

STL serves 2,907,572 people in MO
Lambert-St. Louis International Airport

MCI serves 1,578,341 people in MO
Kansas City International Airport

SGF serves 1,071,699 people in MO
Springfield-Branson National Airport

MEM serves 170,041 people in MO
Memphis International Airport

XNA serves 169,740 people in MO
Northwest Arkansas Regional Airport

DSM serves 51,340 people in MO
Des Moines International Airport

MLI serves 9,445 people in MO
Quad City International Airport

CID serves 8,974 people in MO
The Eastern Iowa Airport

EVV serves 8,387 people in MO
Evansville Regional Airport

OMA serves 8,142 people in MO
Eppley Airfield

PIA serves 5,246 people in MO
General Wayne A. Downing Peoria International Airport (was Greater Peoria Regional Airport)

dividing line

2,187 people
closest airport: STL

7,707 people
closest airport: SGF

6,905 people
closest airport: STL

closest airport: SGF

closest airport: STL

closest airport: MCI

closest airport: EVV

closest airport: MEM

closest airport: XNA

11 people

closest airport: DSM

102 people

closest airport: MLI

closest airport: CID

8 people

closest airport: OMA

closest airport: PIA