We don't even know if FNMA is basing their "market area" on census tracts, zip codes, MSAs, addresses, or even counties. We might not even on the same runway, let alone the same plane. My county has the same census tracts as when I started in 1991. WTF? We have towns that are now 20,000 that were 800 then. We have huge changes in the rural demographic as "greenfield" subdivisions are chopping old farmland up into estates. The first dairy farm appraisal I was on was less than 3 miles from WallyWorld Hdq. and it is now a subdivision. In fact, I have valued dozens of dairies and at this time, I don't think there is a single surviving dairy in the county. The first poultry farm I did disappeared 20 years ago. It is all houses now. City limits have expanded on every town in the county, some extending miles and one berg that was not incorporated, incorporated and took in the regional airport and by area is possibly the largest "town" in the county. And it doesn't even have a school nor post office. And yet the census tract is supposed to be so important? Nonsense.