Columbus, OH
City -- 730,657
Metro -- 1,708,625
(from 2005 US Census estimates)
And the info (as of 2000) for where I lived most of my life:
Brown County, OH -- 42,285 (that's for the entire county)
Fayetteville, OH -- 372 (I never lived in town, but it was nearest town to where I lived)
City living has been an interesting adjustment for me.