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)

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 39762 41546 42323 43531 44424 45495 46313 38.55
Prince George's 11608 12240 12446 12830 13077 13324 13521 46.88
Montgomery 8417 8950 9052 9260 9432 9699 9922 30.15
Baltimore 4749 4920 5025 5135 5170 5290 5373 44.18
Baltimore City 3830 4002 4152 4339 4492 4673 4782 29.72
Anne Arundel 2893 2981 3033 3132 3207 3282 3307 91.00
Frederick 1460 1491 1533 1568 1625 1661 1696 32.89
Howard 1416 1465 1494 1548 1586 1638 1667 39.15
Charles 867 895 921 943 956 969 989 33.58
Wicomico 837 839 848 844 854 859 867 74.43
Carroll 703 712 720 733 755 765 783 29.46
Harford 695 709 721 737 746 764 780 33.10
Washington 343 352 364 377 389 398 408 27.59
St. Mary's 326 338 340 357 370 379 393 18.76
Cecil 318 323 328 331 339 342 345 79.02
Calvert 245 255 259 278 291 298 304 34.43
Caroline 200 208 210 216 223 231 240 17.79
Worcester 164 164 169 181 180 180 183 41.59
Allegany 164 166 166 166 168 168 170 58.22
Kent 140 144 145 143 146 148 152 25.65

District of Columbia

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
District of Columbia 7270 7434 7551 7788 7893 7966 8110 38.34
State Total 7270 7434 7551 7788 7893 7966 8110 38.34
Out of DC 0 0 0 0 0 0 0 0.00
Unassigned 0 0 0 0 0 0 0 0.00

Northern Virginia

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 31140 32145 32908 34137 34950 35749 36244 50.06
Fairfax 7843 8020 8163 8580 8734 8945 8989 140.91
Arlington 1638 1688 1728 1763 1795 1804 1873 18.12
Alexandria 1510 1544 1577 1627 1657 1703 1733 39.35

Delaware Beaches

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 7869 8037 8194 8386 8529 8529 8809 21.11
Sussex 3861 3904 3960 4006 4048 4048 4103 51.02

South Dakota

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 4027 4085 4177 4177 4356 4464 4563 31.25
Minnehaha 3150 3165 3182 3182 3211 3248 3260 187.61
Pennington 58 74 85 85 127 138 152 6.83
Brookings 14 14 14 14 14 15 15 0.00
Davison 9 9 9 9 9 9 9 0.00

Massachusetts

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 87052 87925 88970 90084 90889 91662 92675 62.72
Suffolk 16671 16825 16962 17089 17180 17291 17417 95.12
Hampshire 774 780 792 806 812 819 830 51.61

New York

New York county includes all five boroughs (including Kings, Queens, Bronx, and Richmond counties).
2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 351371 352845 354370 356458 358154 359926 361515 157.01
New York 193230 193821 194550 195675 196484 197266 198123 159.55
Nassau 39225 39295 39368 39487 39608 39726 39837 248.07
Westchester 32323 32402 32517 32673 32767 32881 32968 261.97

Cumulative Deaths

Maryland (top 20 counties)

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 2023 2081 2123 2159 2207 2243 2277 45.73
Montgomery 480 503 515 528 540 550 558 47.65
Prince George's 436 445 453 466 477 484 490 55.91
Baltimore 255 263 277 286 292 299 300 207.25
Baltimore City 208 210 215 218 220 229 231 79.37
Anne Arundel 142 145 145 147 149 150 153 34.66
Frederick 90 90 93 94 95 96 98 33.27
Carroll 68 69 71 70 73 76 76 0.00
Charles 62 63 64 65 67 69 69 0.00
Unassigned 86 88 74 65 65 58 65 5.74
Howard 45 49 50 49 50 52 52 0.00
Harford 34 35 39 40 46 46 48 15.94
Wicomico 21 21 21 22 22 22 22 0.00
Cecil 17 18 20 20 20 20 21 13.86
Calvert 13 13 14 15 15 15 15 0.00
Kent 14 14 14 14 15 15 14 -10.40
St. Mary's 11 12 12 13 13 14 14 0.00
Allegany 14 14 14 14 14 14 14 0.00
Queen Anne's 10 11 11 11 12 12 12 0.00
Washington 8 8 9 10 10 10 11 6.93

District of Columbia

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
District of Columbia 392 400 407 412 418 427 432 59.19
State Total 392 400 407 412 418 427 432 59.19
Out of DC 0 0 0 0 0 0 0 0.00
Unassigned 0 0 0 0 0 0 0 0.00

Northern Virginia

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 1015 1042 1075 1100 1136 1159 1171 66.95
Fairfax 284 292 302 309 321 326 327 225.97
Arlington 77 79 81 89 91 95 98 21.95
Alexandria 34 34 34 37 37 38 38 0.00

Delaware Beaches

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 297 304 310 317 322 322 326 55.80
Sussex 114 115 116 117 119 119 121 41.24

South Dakota

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 44 46 46 48 50 50 50 0.00
Minnehaha 39 40 40 41 43 43 43 0.00
Pennington 1 2 2 3 3 3 3 0.00
Brookings 0 0 0 0 0 0 0 0.00
Davison 0 0 0 0 0 0 0 0.00

Massachusetts

2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 5862 5938 6066 6148 6228 6304 6372 64.26
Suffolk 793 797 807 813 818 827 838 52.11
Hampshire 72 73 76 76 76 77 78 53.37

New York

New York county includes all five boroughs (including Kings, Queens, Bronx, and Richmond counties).
2020-05-18 2020-05-19 2020-05-20 2020-05-21 2020-05-22 2020-05-23 2020-05-24 Doubling Time
State Total 28339 28558 28636 28743 28853 29031 29141 182.93
New York 20806 20887 20934 21003 21086 21138 21216 187.84
Nassau 2053 2060 2065 2073 2082 2087 2094 206.66
Westchester 1295 1298 1305 1313 1319 1327 1337 91.98

Sources