Table:
text: List of the most populous counties in the United States
List of the most populous US counties sorted according to the mid-2011 official estimate by the USCB
List of the most populous US counties sorted according to the mid-2011 official estimate by the USCB
Rank_ County State_ Land_area_km² Land_area_mi² April_1_2010_census April_1_2010_density_km² April_1_2010_density_mi² July_1_2010_official_estimate July_1_2010_density_km² July_1_2010_density_mi² July_1_2011_official_estimate July_1_2011_density_km² July_1_2011_density_mi² Mid_2010_to_mid_2011_change_Absolute Mid_2010_to_mid_2011_change_ County_seat_or_courthouse
66 Middlesex County New Jersey 800.08 308.91 809858 1012 2622 810747 1013 2625 814217 1018 2636 3470 0.43 New Brunswick
67 San Francisco County California 121.40 46.87 805235 6633 17179 805340 6634 17181 812826 6695 17341 7486 0.93 San Francisco
68 Collin County Texas 2178.76 841.22 782341 359 930 788511 362 937 812226 373 966 23715 3.01 McKinney
69 Baltimore County Maryland 1549.59 598.30 805029 520 1346 805964 520 1347 809941 523 1354 3977 0.49 Towson
70 Pierce County Washington 4324.01 1669.51 795225 184 476 795371 184 476 807904 187 484 12533 1.58 Tacoma
71 Montgomery County Pennsylvania 1251.07 483.04 799874 639 1656 800482 640 1657 804210 643 1665 3728 0.47 Norristown

Question: From the list of the most populous counties in the United States, what is the density on July 1, 2011 when the official estimate as of July 1, 2010 is 800,482?