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Here are the actual Seroprevalence Survey results, from the CDC Commercial Laboratory Seroprevalence Survey Data Released on June 25, 2020:

https://www.cdc.gov/coronavirus/2019-ncov/cases-updates/commercial-lab-surveys.html

OK, now that some seroprevalence survey results are finally available (even though they are at least two months out of date (and not really accurately applicable to current up to date Covid-19 tracking) I'll display how to use them anyway.

New York (note Metro area not necessarily same as state)

total cases = 422,268 total deaths= 32,248
4/01/2020 seroprevalence survey adjustment 12X higher Total Infections = 5,067,216

32.248 deaths / 5,067,216 = IFR (Infection Fatality Rate) 0.63%

Connecticut

total cases = 46,717 total deaths= 4,335
5/03/2020 seroprevalence survey adjustment 6X higher Total Infections = 280,302

4,335 deaths / 280,302 = IFR (Infection Fatality Rate) 1.54%

Western Washington State (note western area not necessarily same as state)

total cases = 36708 total deaths= 1,359
4/01/2020 seroprevalence survey adjustment 11X higher Total Infections = 403,788

1,359 deaths / 403,788 = IFR (Infection Fatality Rate) 0.33%

South Florida (note South Florida not necessarily same as state)

total cases = 200,111 total deaths= 3,732
4/10/2020 seroprevalence survey adjustment 11X higher Total Infections = 2,201,221

3,732 deaths / 2,201,221 = IFR (Infection Fatality Rate) 0.17%

Missouri

total cases = 24,444 total deaths= 1,074
4/26/2020 seroprevalence survey adjustment 24X higher Total Infections = 586,656

1,074 deaths / 586,656 = IFR (Infection Fatality Rate) 0.18%

Utah

total cases =24,952 total deaths= 184
5/03/2020 seroprevalence survey adjustment 11X higher Total Infections = 274,472

184 deaths / 274,472 = IFR (Infection Fatality Rate) 0.07%