Of course, there are metro areas, and metro areas. thelakelander is right about the Metropolitan Statistical Area (MSA), but the First Coast Metropolitan Planning Organization (FCMPO) does not include Baker, but includes all of Duval, and large portions (but not all) of Clay, Nassau, and St. Johns. Different Federal agency (USDOT vs Commerce? Census?), so different rules. I would guess that at least part of Baker would join in after the 2010 census.