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)

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 66777 67254 67559 67918 68423 68961 69341 125.79
Prince George's 18414 18505 18572 18645 18731 18861 18940 165.49
Montgomery 14607 14675 14737 14803 14899 15021 15082 170.68
Baltimore 7847 7929 7985 8040 8105 8183 8234 111.22
Baltimore City 7416 7498 7546 7605 7701 7789 7857 79.40
Anne Arundel 5055 5092 5109 5134 5179 5200 5239 92.42
Howard 2501 2527 2538 2568 2602 2618 2637 95.51
Frederick 2471 2486 2490 2493 2501 2520 2546 67.18
Charles 1371 1383 1393 1399 1416 1426 1430 247.11
Harford 1096 1108 1116 1127 1153 1173 1176 271.02
Carroll 1105 1114 1117 1136 1149 1155 1156 800.58
Wicomico 1060 1062 1067 1070 1074 1085 1087 376.03
Washington 694 695 698 697 687 691 695 119.74
St. Mary's 620 633 637 639 646 651 652 451.24
Cecil 473 478 479 480 486 487 490 112.52
Calvert 410 413 414 415 418 419 419 0.00
Caroline 315 318 319 320 321 321 322 222.50
Worcester 282 286 286 289 289 291 292 201.71
Queen Anne's 226 227 230 230 232 234 240 27.03
Allegany 204 204 205 205 205 206 208 71.39

District of Columbia

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
District of Columbia 10248 10292 10327 10365 10390 10435 10447 602.75
State Total 10248 10292 10327 10365 10390 10435 10447 602.75
Out of DC 0 0 0 0 0 0 0 0.00
Unassigned 0 0 0 0 0 0 0 0.00

Northern Virginia

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 61736 62189 62787 63203 63735 64393 65109 62.34
Fairfax 13778 13840 13850 13864 13886 13965 14072 90.47
Arlington 2464 2466 2479 2484 2496 2500 2519 91.20
Alexandria 2312 2317 2325 2325 2327 2338 2357 85.29

Delaware Beaches

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 11226 11376 11474 11510 11731 11923 11996 113.21
Sussex 4608 4637 4681 4690 4779 4847 4854 479.95

South Dakota

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 6681 6716 6764 6826 6893 6978 7028 96.74
Minnehaha 3598 3600 3610 3627 3638 3655 3659 633.36
Pennington 507 513 518 523 536 546 556 37.85
Brookings 61 61 62 65 68 70 73 16.17
Davison 39 40 41 41 43 44 44 0.00

Massachusetts

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 108667 108768 108882 109143 109338 109628 109838 361.85
Suffolk 19795 19795 19819 19853 19892 19936 19972 383.85
Hampshire 958 959 962 965 969 976 982 112.75

New York

New York county includes all five boroughs (including Kings, Queens, Bronx, and Richmond counties).
2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 392539 392930 393454 394079 394954 395872 396598 377.96
New York 214750 214939 215179 215475 215902 216362 216730 407.53
Nassau 41754 41780 41807 41853 41910 41947 41988 709.16
Westchester 34780 34798 34838 34866 34912 34980 35020 606.16

Cumulative Deaths

Maryland (top 20 counties)

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 3168 3175 3190 3205 3212 3223 3236 171.85
Montgomery 735 736 738 739 743 747 748 517.78
Prince George's 678 680 682 686 685 687 688 476.19
Baltimore 467 470 473 474 474 478 480 165.66
Baltimore City 335 335 337 338 340 342 344 118.53
Anne Arundel 207 207 207 209 210 209 209 0.00
Frederick 117 117 117 118 118 119 120 82.48
Carroll 111 112 112 112 112 112 114 38.82
Howard 85 85 84 89 89 91 91 0.00
Charles 86 86 86 86 86 86 87 59.61
Harford 61 62 62 62 63 63 63 0.00
St. Mary's 51 51 51 51 51 51 51 0.00
Wicomico 40 41 41 41 40 40 41 27.73
Washington 26 26 27 28 28 28 29 19.41
Cecil 29 29 29 29 29 29 29 0.00
Calvert 26 26 27 27 27 27 27 0.00
Kent 23 23 23 23 23 23 23 0.00
Unassigned 26 24 29 25 26 23 23 0.00
Queen Anne's 17 17 17 19 19 19 20 13.17
Worcester 16 16 16 17 17 17 17 0.00

District of Columbia

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
District of Columbia 550 551 551 553 554 555 557 192.35
State Total 550 551 551 553 554 555 557 192.35
Out of DC 0 0 0 0 0 0 0 0.00
Unassigned 0 0 0 0 0 0 0 0.00

Northern Virginia

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 1732 1740 1763 1786 1816 1845 1849 319.71
Fairfax 473 478 488 488 492 494 495 342.41
Arlington 132 132 132 132 132 132 131 -91.50
Alexandria 57 57 57 57 57 57 57 0.00

Delaware Beaches

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 507 507 509 509 510 512 512 0.00
Sussex 176 176 176 176 175 175 175 0.00

South Dakota

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 91 91 91 93 97 97 97 0.00
Minnehaha 57 57 57 58 58 58 58 0.00
Pennington 16 16 16 16 17 17 17 0.00
Brookings 0 0 0 0 0 0 0 0.00
Davison 0 0 0 0 0 0 0 0.00

Massachusetts

2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 8060 8095 8054 8081 8132 8149 8172 245.59
Suffolk 1004 1007 1002 1004 1008 1009 1008 -699.39
Hampshire 110 110 110 112 114 115 116 79.71

New York

New York county includes all five boroughs (including Kings, Queens, Bronx, and Richmond counties).
2020-06-28 2020-06-29 2020-06-30 2020-07-01 2020-07-02 2020-07-03 2020-07-04 Doubling Time
State Total 31943 31961 32032 32043 32064 32137 32157 1113.78
New York 23016 23028 23096 23104 23123 23140 23159 844.18
Nassau 2182 2182 2182 2183 2184 2185 2186 1514.53
Westchester 1419 1424 1425 1425 1426 1426 1426 0.00

Sources