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)

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 133548 134329 135127 135657 136154 136744 137236 192.65
Prince George's 31102 31210 31367 31442 31497 31617 31695 280.96
Montgomery 24015 24174 24291 24395 24466 24560 24664 163.69
Baltimore 19275 19403 19494 19565 19646 19749 19799 273.78
Baltimore City 16647 16681 16773 16842 16906 16937 17000 186.35
Anne Arundel 11053 11151 11222 11265 11336 11391 11433 187.99
Howard 5508 5534 5566 5580 5605 5628 5647 205.32
Frederick 4436 4464 4498 4519 4534 4546 4559 242.39
Harford 3335 3353 3374 3395 3417 3430 3448 132.08
Charles 2983 2991 3007 3018 3029 3041 3050 234.21
Wicomico 2259 2287 2320 2337 2357 2374 2385 149.59
Carroll 2108 2120 2128 2137 2141 2152 2159 213.09
Washington 2054 2075 2093 2099 2108 2116 2137 69.84
St. Mary's 1382 1385 1392 1395 1400 1409 1416 139.52
Cecil 1192 1244 1262 1269 1275 1284 1291 127.14
Worcester 1151 1159 1164 1165 1168 1174 1181 116.25
Calvert 1082 1098 1113 1117 1120 1132 1141 87.18
Queen Anne's 714 719 725 734 736 740 742 256.46
Dorchester 653 661 679 687 695 711 715 123.21
Caroline 688 687 699 704 704 710 713 164.04

District of Columbia

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
District of Columbia 16166 16255 16334 16370 16395 16445 16498 215.07
State Total 16166 16255 16334 16370 16395 16445 16498 215.07
Out of DC 0 0 0 0 0 0 0 0.00
Unassigned 0 0 0 0 0 0 0 0.00

Northern Virginia

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 162538 163710 164795 165676 166360 167270 168260 117.11
Fairfax 22340 22460 22530 22616 22687 22769 22849 197.28
Arlington 4278 4318 4345 4372 4384 4399 4437 80.24
Alexandria 4077 4086 4104 4117 4123 4133 4144 260.43

Delaware Beaches

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 22560 22724 22942 23093 23196 23325 23375 323.35
Sussex 7346 7390 7476 7518 7560 7593 7609 328.94

South Dakota

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 31012 31805 32611 33269 33836 34457 35044 40.69
Minnehaha 8531 8712 8892 9012 9163 9291 9437 44.11
Pennington 3378 3468 3504 3554 3591 3687 3742 46.47
Brookings 1085 1109 1155 1199 1223 1231 1242 77.57
Davison 635 654 689 704 732 740 753 39.46

Massachusetts

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 141579 142346 142930 143660 144488 145464 146166 143.63
Suffolk 26012 26160 26250 26383 26546 26663 26787 149.04
Hampshire 1376 1386 1389 1400 1401 1412 1420 122.34

New York

New York county includes all five boroughs (including Kings, Queens, Bronx, and Richmond counties).
2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 479400 481107 482891 484281 485279 486480 488506 166.44
Nassau 48272 48377 48494 48596 48657 48731 48864 253.97
Westchester 39200 39288 39398 39476 39548 39616 39694 352.05
New York 34637 34735 34871 34991 35054 35125 35249 196.35

Cumulative Deaths

Maryland (top 20 counties)

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 4028 4032 4036 4037 4041 4050 4058 350.91
Montgomery 860 860 860 860 860 861 862 596.80
Prince George's 841 841 843 845 846 846 848 293.20
Baltimore 649 650 653 653 653 654 656 226.66
Baltimore City 494 495 496 496 496 496 497 343.80
Anne Arundel 262 262 263 263 263 264 265 182.99
Frederick 137 137 137 137 137 137 138 94.96
Carroll 128 128 128 128 128 128 128 0.00
Howard 123 123 123 123 124 124 124 0.00
Charles 101 101 101 101 101 101 101 0.00
Harford 77 77 77 78 78 79 80 54.76
St. Mary's 59 59 59 59 59 59 59 0.00
Wicomico 49 49 49 49 49 49 49 0.00
Washington 42 42 42 42 42 42 42 0.00
Cecil 36 36 36 36 36 36 36 0.00
Worcester 30 30 30 30 30 30 30 0.00
Calvert 28 28 28 28 29 29 29 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 23 23 23 23 23 23 23 0.00

District of Columbia

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
District of Columbia 638 641 641 641 641 642 642 0.00
State Total 638 641 641 641 641 642 642 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

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 3385 3405 3419 3430 3454 3482 3511 83.23
Fairfax 600 599 601 602 602 602 604 208.64
Arlington 152 153 152 152 152 152 152 0.00
Alexandria 73 74 74 74 75 75 75 0.00

Delaware Beaches

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 661 662 664 665 666 668 670 231.51
Sussex 212 213 213 214 214 215 216 149.03

South Dakota

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 304 307 315 323 323 330 333 76.25
Minnehaha 91 92 94 96 96 97 97 0.00
Pennington 43 43 43 44 44 45 45 0.00
Davison 4 4 4 4 4 4 4 0.00
Brookings 2 2 2 2 2 2 2 0.00

Massachusetts

2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 9672 9702 9723 9737 9753 9758 9780 307.44
Suffolk 1153 1155 1156 1156 1160 1161 1163 402.37
Hampshire 152 152 153 153 153 153 153 0.00

New York

New York county includes all five boroughs (including Kings, Queens, Bronx, and Richmond counties).
2020-10-15 2020-10-16 2020-10-17 2020-10-18 2020-10-19 2020-10-20 2020-10-21 Doubling Time
State Total 33337 33337 33347 33357 33366 33366 33371 4625.51
New York 3189 3188 3188 3190 3192 3192 3192 0.00
Nassau 2204 2204 2204 2204 2204 2204 2204 0.00
Westchester 1460 1460 1460 1460 1460 1460 1460 0.00

Sources