From: Understanding and evaluating the behavior of technical users. A study of developer interaction at StackOverflow
City name
NY
Wash
Austin
Chicago
Boston
SFO
Seattle
Phil
LA
Avg answers from same city
1.0725
0.95
0.91
0.81
0.79
1.12
1.02
1.74
0.76
Avg ans from rest of the country USA
0.27
0.05
0.06
0.08
0.18
0.11
0.02
0.07