Pricedriss is right, it doesn't matter what airport you go through because it has no bearing on where you'll actually live.
I'm entering through Washington Dulles but going to be living in Pennsylvania as my address indicated on my forms was in PA.
Case No - DV2013AF0007XXXX (applied the first time and got it the first time - lucky me!)
Entry Checked - 1st May 2012
Forms Sent To KCC - 10th May 2012
Received By KCC - 12th May 2012
Confirmation From KCC - 25th May 2012 after I sent them an email
2nd NL - 14th June 2013
Police Clearance (TZ) - 13th June 2013
Police Clearance (UK) - 21st June 2013
Medicals - Completed 24th June 2013
Interview - Wednesday, August 7th 2013 @ 8am - US Embassy Tanzania
Visa Pick up - Hopefully August 11th
Departure Date - August 17th 2013
Port of Entry - Washington Dulles