| | Anaheim Angels, see Los Angeles Angels |
| 1 | Arizona Diamondbacks | 1998 | 2020 | 3,624 | 1,788 | 1,836 | .493 | -48 | 5 | 1 | 1 | 6 | 511 | 2 | 16,492 | 123,973 | 31,804 | 3,851 | .257 | 16,608 | 4.22 |
| 2 | Atlanta Braves | 1876 | 2020 | 21,570 | 10,732 | 10,684 | .501 | 48 | 20 | 17 | 3 | 26 | 2033 | 53 | 96,095 | 738,734 | 192,010 | 14,003 | .260 | 95,224 | 3.67 |
| | Also played as Milwaukee Braves, Boston Braves, Boston Bees, Boston Rustlers, Boston Doves, Boston Beaneaters and Boston Red Stockings |
| 3 | Baltimore Orioles | 1901 | 2020 | 18,666 | 8,793 | 9,763 | .474 | -970 | 9 | 7 | 3 | 14 | 1873 | 34 | 80,495 | 634,197 | 163,983 | 13,595 | .259 | 85,779 | 4.04 |
| | Also played as St. Louis Browns and Milwaukee Brewers |
| | Boston Braves, see Atlanta Braves |
| 4 | Boston Red Sox | 1901 | 2020 | 18,653 | 9,626 | 8,944 | .518 | 682 | 10 | 14 | 9 | 24 | 1838 | 37 | 87,054 | 638,406 | 170,591 | 13,793 | .267 | 83,499 | 3.91 |
| | Also played as Boston Americans |
| | Brooklyn Dodgers, see Los Angeles Dodgers |
| | California Angels, see Los Angeles Angels |
| 5 | Chicago Cubs | 1876 | 2020 | 21,607 | 11,016 | 10,430 | .514 | 586 | 8 | 17 | 3 | 21 | 2117 | 45 | 99,513 | 739,895 | 194,194 | 14,449 | .262 | 95,943 | 3.68 |
| | Also played as Chicago Orphans, Chicago Colts and Chicago White Stockings |
| 6 | Chicago White Sox | 1901 | 2020 | 18,661 | 9,318 | 9,240 | .502 | 78 | 5 | 6 | 3 | 10 | 1807 | 32 | 81,292 | 632,052 | 164,537 | 11,606 | .260 | 81,011 | 3.78 |
| 7 | Cincinnati Reds | 1882 | 2020 | 21,191 | 10,630 | 10,422 | .505 | 208 | 10 | 10 | 5 | 16 | 2033 | 36 | 95,083 | 722,516 | 188,692 | 13,522 | .261 | 94,173 | 3.75 |
| | Also played as Cincinnati Redlegs and Cincinnati Red Stockings |
| 8 | Cleveland Indians | 1901 | 2020 | 18,665 | 9,512 | 9,062 | .512 | 450 | 10 | 6 | 2 | 15 | 1917 | 34 | 84,546 | 636,580 | 168,986 | 13,228 | .265 | 82,414 | 3.83 |
| | Also played as Cleveland Naps, Cleveland Bronchos and Cleveland Blues |
| 9 | Colorado Rockies | 1993 | 2020 | 4,373 | 2,059 | 2,314 | .471 | -255 | 0 | 1 | 0 | 5 | 593 | 1 | 22,071 | 150,606 | 41,243 | 5,013 | .274 | 23,104 | 4.98 |
| 10 | Detroit Tigers | 1901 | 2020 | 18,688 | 9,369 | 9,226 | .504 | 143 | 7 | 11 | 4 | 16 | 1718 | 24 | 86,165 | 637,752 | 169,126 | 13,904 | .265 | 85,685 | 4.00 |
| 11 | Houston Astros | 1962 | 2020 | 9,332 | 4,630 | 4,697 | .496 | -67 | 10 | 3 | 1 | 14 | 928 | 10 | 39,399 | 316,587 | 80,621 | 7,534 | .255 | 39,337 | 3.81 |
| | Also played as Houston Colt .45s |
| | Kansas City Athletics, see Oakland Athletics |
| 12 | Kansas City Royals | 1969 | 2020 | 8,185 | 3,927 | 4,256 | .480 | -329 | 8 | 4 | 2 | 9 | 922 | 4 | 35,936 | 280,454 | 74,037 | 6,338 | .264 | 37,729 | 4.24 |
| 13 | Los Angeles Angels | 1961 | 2020 | 9,491 | 4,735 | 4,753 | .499 | -18 | 9 | 1 | 1 | 10 | 1100 | 12 | 41,164 | 322,333 | 82,905 | 8,373 | .257 | 41,444 | 3.98 |
| | Also played as Los Angeles Angels of Anaheim, Anaheim Angels and California Angels |
| 14 | Los Angeles Dodgers | 1884 | 2020 | 20,991 | 11,017 | 9,835 | .528 | 1182 | 19 | 25 | 7 | 34 | 1860 | 50 | 94,224 | 715,301 | 187,044 | 13,124 | .261 | 89,007 | 3.53 |
| | Also played as Brooklyn Dodgers, Brooklyn Robins, Brooklyn Superbas, Brooklyn Bridegrooms, Brooklyn Grooms, Brooklyn Grays and Brooklyn Atlantics |
| 15 | Miami Marlins | 1993 | 2020 | 4,364 | 2,021 | 2,343 | .463 | -322 | 0 | 2 | 2 | 3 | 630 | 5 | 18,580 | 148,595 | 38,156 | 3,946 | .257 | 20,310 | 4.31 |
| | Also played as Florida Marlins |
| | Milwaukee Braves, see Atlanta Braves |
| 16 | Milwaukee Brewers | 1969 | 2020 | 8,194 | 3,942 | 4,248 | .481 | -306 | 4 | 1 | 0 | 7 | 930 | 7 | 36,337 | 278,538 | 71,722 | 7,910 | .257 | 37,520 | 4.18 |
| | Also played as Seattle Pilots |
| | Milwaukee Brewers (1901), see Baltimore Orioles |
| 17 | Minnesota Twins | 1901 | 2020 | 18,675 | 8,939 | 9,627 | .481 | -688 | 12 | 6 | 3 | 17 | 1715 | 25 | 82,036 | 637,338 | 167,549 | 11,149 | .263 | 85,322 | 3.99 |
| | Also played as Washington Senators |
| | Montreal Expos, see Washington Nationals |
| | New York Giants, see San Francisco Giants |
| 18 | New York Mets | 1962 | 2020 | 9,324 | 4,474 | 4,842 | .480 | -368 | 6 | 5 | 2 | 9 | 1111 | 15 | 38,233 | 315,837 | 79,015 | 7,757 | .250 | 39,255 | 3.80 |
| 19 | New York Yankees | 1903 | 2020 | 18,366 | 10,411 | 7,867 | .570 | 2544 | 19 | 40 | 27 | 56 | 1709 | 46 | 89,355 | 626,552 | 166,925 | 16,309 | .266 | 76,710 | 3.65 |
| | Also played as New York Highlanders |
| 20 | Oakland Athletics | 1901 | 2020 | 18,627 | 9,064 | 9,476 | .489 | -412 | 17 | 15 | 9 | 29 | 1987 | 41 | 82,560 | 631,869 | 163,289 | 13,378 | .258 | 84,965 | 3.98 |
| | Also played as Kansas City Athletics and Philadelphia Athletics |
| | Philadelphia Athletics, see Oakland Athletics |
| 21 | Philadelphia Phillies | 1883 | 2020 | 21,000 | 9,853 | 11,032 | .472 | -1179 | 12 | 7 | 2 | 14 | 2103 | 35 | 93,055 | 718,795 | 187,366 | 13,321 | .261 | 99,045 | 3.98 |
| | Also played as Philadelphia Quakers |
| 22 | Pittsburgh Pirates | 1882 | 2020 | 21,150 | 10,564 | 10,446 | .503 | 118 | 9 | 9 | 5 | 17 | 2012 | 40 | 94,463 | 725,163 | 191,579 | 11,618 | .264 | 94,041 | 3.73 |
| | Also played as Pittsburgh Alleghenys |
| 23 | San Diego Padres | 1969 | 2020 | 8,198 | 3,784 | 4,412 | .462 | -628 | 5 | 2 | 0 | 6 | 1050 | 12 | 32,900 | 277,293 | 69,176 | 6,490 | .249 | 36,032 | 3.97 |
| 24 | San Francisco Giants | 1883 | 2020 | 21,075 | 11,194 | 9,718 | .535 | 1476 | 8 | 23 | 8 | 26 | 1832 | 57 | 97,567 | 719,718 | 189,871 | 14,763 | .264 | 90,303 | 3.58 |
| | Also played as New York Giants and New York Gothams |
| 25 | Seattle Mariners | 1977 | 2020 | 6,903 | 3,246 | 3,655 | .470 | -409 | 3 | 0 | 0 | 4 | 894 | 6 | 30,697 | 236,029 | 61,244 | 6,874 | .259 | 32,540 | 4.34 |
| | Seattle Pilots, see Milwaukee Brewers |
| | St. Louis Browns, see Baltimore Orioles |
| 26 | St. Louis Cardinals | 1882 | 2020 | 21,191 | 10,948 | 10,091 | .520 | 857 | 14 | 23 | 11 | 30 | 2145 | 47 | 97,246 | 726,771 | 193,447 | 12,350 | .266 | 93,317 | 3.67 |
| | Also played as St. Louis Perfectos, St. Louis Browns and St. Louis Brown Stockings |
| 27 | Tampa Bay Rays | 1998 | 2020 | 3,622 | 1,726 | 1,896 | .477 | -170 | 3 | 2 | 0 | 6 | 509 | 1 | 15,999 | 123,382 | 31,557 | 3,714 | .256 | 16,867 | 4.32 |
| | Also played as Tampa Bay Devil Rays |
| 28 | Texas Rangers | 1961 | 2020 | 9,478 | 4,522 | 4,950 | .477 | -428 | 7 | 2 | 0 | 8 | 1162 | 8 | 42,714 | 323,807 | 83,893 | 9,373 | .259 | 44,680 | 4.28 |
| | Also played as Washington Senators |
| 29 | Toronto Blue Jays | 1977 | 2020 | 6,904 | 3,415 | 3,486 | .495 | -71 | 6 | 2 | 2 | 8 | 842 | 8 | 31,901 | 236,772 | 61,666 | 7,410 | .260 | 31,797 | 4.24 |
| 30 | Washington Nationals | 1969 | 2020 | 8,190 | 4,003 | 4,183 | .489 | -180 | 5 | 1 | 1 | 6 | 959 | 10 | 34,333 | 277,228 | 70,426 | 6,951 | .254 | 35,165 | 3.88 |
| | Also played as Montreal Expos |
| | Washington Senators (1901-1960), see Minnesota Twins |
| | Washington Senators (1961-1971), see Texas Rangers |
Earlier Franchises