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    By Car
Columbus is centrally located in the eastern US along I-70. Some distances are 410mi from Washington, DC, 355mi from Chicago, IL, and 380 mi from Nashville, TN. 

See here for Driving Directions to Campus. 

See here for Mapquest Directions

There are several parking garages on campus that you can use. The closest to the math department are the Tuttle,  Northwest, and Arps Parking Garages. Be sure to pick up "Tokens" at the conference registration in order to park for free.

By Plane 
The main airport is Port Columbus (CMH). 

A taxi fare from the airport to OSU campus is around $20. There are also shuttle services and rental car companies available at the airport. Some of the hotels provide shuttle service as well if you make a reservation in advance.

You may also take the public bus service, called the "Capital Flyer", which runs hourly between 7am and 9pm from the airport to downtown ($5). In downtown you then have to go to High Street and take the #2 Bus north until campus ($1.25).

Airfares into Columbus for the conference dates are presently between $100 (e.g. MDW)  to $350 (e.g. SFO) from most places in the US. Occasionally cheaper airfares can be found for nearby airports. The closest larger ones are: