Covid Tracker

Below are the current cumulative cases and deaths in Maryland, the DC area, and selected other counties that are important to me.

Notes and Caveats

Doubling Time refers to the prejected number of days that cases or deaths will be expected to double. The longer the timeframe the better. As a comparison:

  • The sharpest growth rates in cases in Japan, Singapore, and Hong Kong came when cases were doubling after 7+ days, while China, Spain, and Italy were doubling very 2 days.
  • At their worst, deaths in Lombardy (N. Italy), Madrid, and Catalonia (Spain) were doubling in 1.5 days. Wuhan was doubling about every 2 - 2.5 days

Cases provide more information to be able to judge the rate of spread, but the availability of test kits varies by state and county, so the data is unreliable.

Deaths are (thankfully) low in most counties, so predicting a rate of growth is difficult. Take Doubling Times with a healthy grain of salt until the cumulative deaths reach 10 - 20.

Cumulative Cases

Maryland (top 20 counties)

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 115533 116110 116646 117245 117888 118519 119062 151.29
Prince George's 27589 27683 27760 27891 28034 28202 28361 122.94
Montgomery 21089 21167 21281 21375 21467 21574 21640 226.58
Baltimore 16648 16724 16797 16905 17165 17221 17288 178.16
Baltimore City 15183 15254 15299 15236 15085 15129 15177 218.47
Anne Arundel 9065 9119 9191 9302 9398 9452 9504 125.99
Howard 4743 4768 4787 4809 4843 4863 4881 187.27
Frederick 3717 3742 3756 3785 3811 3834 3851 156.33
Harford 2781 2811 2834 2846 2865 2883 2900 117.55
Charles 2554 2570 2591 2607 2628 2646 2664 101.89
Carroll 1842 1852 1863 1871 1881 1888 1891 436.22
Wicomico 1754 1770 1778 1819 1833 1846 1855 142.17
Washington 1474 1493 1506 1525 1546 1556 1589 32.68
St. Mary's 1186 1193 1197 1202 1217 1232 1241 94.88
Worcester 930 940 948 953 961 974 975 675.13
Cecil 904 911 918 942 949 964 968 167.05
Calvert 854 862 874 881 885 898 901 207.48
Queen Anne's 606 607 612 613 618 626 630 108.48
Caroline 606 609 609 612 620 620 622 214.88
Dorchester 514 527 530 538 546 554 557 128.00

District of Columbia

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
District of Columbia 14493 14592 14622 14687 14743 14790 14852 165.35
State Total 14493 14592 14622 14687 14743 14790 14852 165.35
Out of DC 0 0 0 0 0 0 0 0.00
Unassigned 0 0 0 0 0 0 0 0.00

Northern Virginia

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 132868 133742 134493 135428 136269 137367 138605 76.91
Fairfax 19495 19601 19658 19732 19837 19921 20041 115.07
Arlington 3710 3727 3741 3759 3779 3791 3819 93.85
Alexandria 3594 3602 3613 3615 3628 3649 3671 114.97

Delaware Beaches

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 18726 18849 18937 19137 19234 19318 19366 278.96
Sussex 6491 6504 6519 6567 6578 6585 6570 -304.29

South Dakota

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 16437 16638 16801 16994 17291 17686 18075 31.51
Minnehaha 5839 5874 5898 5938 5992 6033 6105 58.08
Pennington 1766 1795 1814 1841 1862 1897 1926 45.34
Brookings 589 595 600 603 609 622 632 43.11
Davison 169 171 171 176 181 186 197 11.72

Massachusetts

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 124540 124826 125080 125393 125699 126128 126582 192.57
Suffolk 23130 23194 23236 23306 23371 23464 23552 184.82
Hampshire 1196 1196 1196 1198 1199 1200 1203 277.26

New York

New York county includes all five boroughs (including Kings, Queens, Bronx, and Richmond counties).
2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 443640 444365 444948 445714 446366 447262 448052 392.43
Nassau 45633 45711 45763 45840 45906 45989 46052 505.99
Westchester 37486 37531 37571 37601 37634 37672 37718 567.66
New York 32643 32677 32728 32772 32835 32892 32938 495.63

Cumulative Deaths

Maryland (top 20 counties)

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 3836 3838 3839 3849 3855 3861 3869 334.53
Montgomery 834 834 834 835 835 836 837 579.47
Prince George's 810 813 813 813 814 817 817 0.00
Baltimore 610 611 612 613 614 614 617 141.86
Baltimore City 472 473 473 474 476 478 478 0.00
Anne Arundel 240 240 240 240 241 242 242 0.00
Frederick 128 128 128 128 129 129 129 0.00
Carroll 123 123 123 123 123 123 123 0.00
Howard 119 119 119 119 119 119 119 0.00
Charles 95 95 95 95 96 96 97 66.54
Harford 75 75 75 75 75 76 76 0.00
St. Mary's 57 57 57 57 57 57 57 0.00
Wicomico 48 48 48 48 48 48 48 0.00
Washington 35 35 35 35 36 36 36 0.00
Cecil 31 31 31 31 32 32 33 22.18
Calvert 28 28 28 28 28 28 28 0.00
Worcester 26 26 26 26 26 26 26 0.00
Queen Anne's 26 26 26 26 26 26 26 0.00
Kent 24 24 24 24 24 24 24 0.00
Allegany 22 22 22 22 22 22 22 0.00

District of Columbia

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
District of Columbia 616 616 616 616 617 619 619 0.00
State Total 616 616 616 616 617 619 619 0.00
Out of DC 0 0 0 0 0 0 0 0.00
Unassigned 0 0 0 0 0 0 0 0.00

Northern Virginia

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 2722 2724 2743 2837 2882 2918 2947 69.74
Fairfax 568 568 568 569 572 573 574 397.17
Arlington 145 145 145 145 146 146 146 0.00
Alexandria 62 62 62 65 66 66 67 45.75

Delaware Beaches

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 613 615 617 618 619 619 620 429.06
Sussex 197 197 198 199 200 200 200 0.00

South Dakota

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 183 184 184 184 192 193 195 66.89
Minnehaha 74 74 74 74 76 76 76 0.00
Pennington 33 33 33 33 34 34 34 0.00
Brookings 1 1 1 1 2 2 2 0.00
Davison 2 2 2 2 2 2 2 0.00

Massachusetts

2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 9196 9210 9219 9225 9245 9260 9269 713.17
Suffolk 1116 1116 1119 1120 1122 1122 1124 388.86
Hampshire 141 141 141 141 141 141 141 0.00

New York

New York county includes all five boroughs (including Kings, Queens, Bronx, and Richmond counties).
2020-09-12 2020-09-13 2020-09-14 2020-09-15 2020-09-16 2020-09-17 2020-09-18 Doubling Time
State Total 33023 33023 33030 33038 33042 33070 33085 1528.16
New York 3176 3176 3177 3177 3177 3177 3178 2202.13
Nassau 2199 2199 2199 2199 2199 2199 2201 762.12
Westchester 1452 1452 1452 1452 1452 1452 1454 503.22

Sources