What country had a July 1, 2010 density of 41?
CREATE TABLE "list_of_the_most_populous_us_counties_so" (
  "rank" text,
  "county" text,
  "state" text,
  "land_area_km" text,
  "land_area_mi" text,
  "april_1_2010_census" text,
  "april_1_2010_density_km" text,
  "april_1_2010_density_mi" text,
  "july_1_2010_official_estimate" text,
  "july_1_2010_density_km" text,
  "july_1_2010_density_mi" text,
  "july_1_2011_official_estimate" text,
  "july_1_2011_density_km" text,
  "july_1_2011_density_mi" text,
  "mid_2010_to_mid_2011_change_absolute" text,
  "mid_2010_to_mid_2011_change_pct" text,
  "county_seat_or_courthouse" text
);
SELECT "county" FROM "list_of_the_most_populous_us_counties_so" WHERE "july_1_2010_density_km"='41';