CREATE TABLE table_6166 ("County" TEXT, "Per capita income" TEXT, "Median household income" TEXT, "Median family income" TEXT, "Population" FLOAT, "Number of households" FLOAT)

Which Population is the lowest one that has a Median family income of $74,905, and a Number of households smaller than 145,790?
SELECT MIN("Population") FROM table_6166 WHERE "Median family income" = '$74,905' AND "Number of households" < '145,790'
SELECT MIN("Population") FROM "table_6166" WHERE "Median family income" = '$74,905' AND "Number of households" < '145,790'