Reverse Engineering Finance

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Reverse Engineering Finance
How Freddie Mac and Fannie Mae loans distribute by Census Tract

How Freddie Mac and Fannie Mae loans distribute by Census Tract

Very Different from FHA

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John Comiskey
Jul 01, 2025
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Reverse Engineering Finance
How Freddie Mac and Fannie Mae loans distribute by Census Tract
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The saying ‘All Real Estate is Local’ can be applied to first lien mortgages on that real estate as well. This post presents interactive heat maps detailing how Fannie Mae and Freddie Mac mortgages in mortgage backed securities (MBS) distribute by census tract across the country (except again for Connecticut, but Ill clean that up soon enough).

As with the FHA mortgages, each interactive map contains the number of linked mortgages, active as of the May MBS disclosure data, a scaling of that number to the full FNMA or FHLMC portfolio, and a ratio of that scaled number to the number of single family homes estimated for that census tract in 2025.

Each market is different, but there are often striking differences between the prevalence of FHLMC/FNMA mortgages for a tract vs. FHA prevalence. For example in Phoenix compare FHA

FHA Mortgage Distribution by census tract in Phoenix

to Freddie Mac

FHLMC Mortgage Distribution by census tract in Phoenix

to Fannie Mae (which closely tracks FHLMC)

FNMA Mortgage Distribution by census tract in Phoenix

More maps and analysis to come but for today I will leave you to check out metro areas or census tracts you are particularly interested in.

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