| Anaheim Angels, see Los Angeles Angels |
1 | Arizona Diamondbacks | 1998 | 2020 | 3,604 | 1,778 | 1,826 | .493 | -48 | 5 | 1 | 1 | 6 | 507 | 2 | 16,386 | 123,301 | 31,629 | 3,826 | .257 | 16,514 | 4.22 |
2 | Atlanta Braves | 1876 | 2020 | 21,549 | 10,720 | 10,675 | .501 | 45 | 19 | 17 | 3 | 25 | 2030 | 53 | 95,959 | 737,980 | 191,802 | 13,965 | .260 | 95,114 | 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 | 18,645 | 8,786 | 9,749 | .474 | -963 | 9 | 7 | 3 | 14 | 1870 | 34 | 80,408 | 633,505 | 163,808 | 13,572 | .259 | 85,684 | 4.04 |
| Also played as St. Louis Browns and Milwaukee Brewers |
| Boston Braves, see Atlanta Braves |
4 | Boston Red Sox | 1901 | 2020 | 18,634 | 9,616 | 8,935 | .518 | 681 | 10 | 14 | 9 | 24 | 1832 | 37 | 86,953 | 637,733 | 170,406 | 13,763 | .267 | 83,404 | 3.91 |
| Also played as Boston Americans |
| Brooklyn Dodgers, see Los Angeles Dodgers |
| California Angels, see Los Angeles Angels |
5 | Chicago Cubs | 1876 | 2020 | 21,587 | 11,005 | 10,421 | .514 | 584 | 7 | 17 | 3 | 20 | 2111 | 45 | 99,434 | 739,248 | 194,064 | 14,432 | .263 | 95,876 | 3.68 |
| Also played as Chicago Orphans, Chicago Colts and Chicago White Stockings |
6 | Chicago White Sox | 1901 | 2020 | 18,641 | 9,308 | 9,230 | .502 | 78 | 5 | 6 | 3 | 9 | 1804 | 32 | 81,196 | 631,381 | 164,371 | 11,580 | .260 | 80,928 | 3.78 |
7 | Cincinnati Reds | 1882 | 2020 | 21,171 | 10,617 | 10,415 | .505 | 202 | 10 | 10 | 5 | 15 | 2033 | 36 | 94,999 | 721,899 | 188,564 | 13,495 | .261 | 94,112 | 3.75 |
| Also played as Cincinnati Redlegs and Cincinnati Red Stockings |
8 | Cleveland Indians | 1901 | 2020 | 18,644 | 9,501 | 9,052 | .512 | 449 | 10 | 6 | 2 | 14 | 1916 | 34 | 84,461 | 635,902 | 168,830 | 13,209 | .265 | 82,320 | 3.83 |
| Also played as Cleveland Naps, Cleveland Bronchos and Cleveland Blues |
9 | Colorado Rockies | 1993 | 2020 | 4,352 | 2,052 | 2,300 | .472 | -248 | 0 | 1 | 0 | 5 | 590 | 1 | 21,989 | 149,888 | 41,062 | 4,998 | .274 | 22,980 | 4.98 |
10 | Detroit Tigers | 1901 | 2020 | 18,667 | 9,363 | 9,211 | .504 | 152 | 7 | 11 | 4 | 16 | 1715 | 24 | 86,090 | 637,069 | 168,967 | 13,889 | .265 | 85,558 | 3.99 |
11 | Houston Astros | 1962 | 2020 | 9,311 | 4,622 | 4,684 | .497 | -62 | 10 | 3 | 1 | 13 | 928 | 10 | 39,331 | 315,911 | 80,476 | 7,511 | .255 | 39,249 | 3.81 |
| Also played as Houston Colt .45s |
| Kansas City Athletics, see Oakland Athletics |
12 | Kansas City Royals | 1969 | 2020 | 8,165 | 3,915 | 4,248 | .480 | -333 | 8 | 4 | 2 | 9 | 920 | 4 | 35,843 | 279,783 | 73,865 | 6,315 | .264 | 37,654 | 4.24 |
13 | Los Angeles Angels | 1961 | 2020 | 9,472 | 4,725 | 4,744 | .499 | -19 | 9 | 1 | 1 | 10 | 1099 | 12 | 41,070 | 321,679 | 82,731 | 8,346 | .257 | 41,347 | 3.97 |
| Also played as Los Angeles Angels of Anaheim, Anaheim Angels and California Angels |
14 | Los Angeles Dodgers | 1884 | 2020 | 20,972 | 11,004 | 9,829 | .528 | 1175 | 18 | 24 | 6 | 33 | 1859 | 50 | 94,105 | 714,645 | 186,871 | 13,081 | .261 | 88,925 | 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 | 4,338 | 2,007 | 2,331 | .463 | -324 | 0 | 2 | 2 | 2 | 627 | 5 | 18,460 | 147,757 | 37,941 | 3,918 | .257 | 20,157 | 4.31 |
| Also played as Florida Marlins |
| Milwaukee Braves, see Atlanta Braves |
16 | Milwaukee Brewers | 1969 | 2020 | 8,172 | 3,931 | 4,237 | .481 | -306 | 4 | 1 | 0 | 6 | 930 | 7 | 36,244 | 277,865 | 71,566 | 7,883 | .258 | 37,441 | 4.18 |
| Also played as Seattle Pilots |
| Milwaukee Brewers (1901), see Baltimore Orioles |
17 | Minnesota Twins | 1901 | 2020 | 18,656 | 8,928 | 9,619 | .481 | -691 | 11 | 6 | 3 | 16 | 1713 | 25 | 81,946 | 636,720 | 167,399 | 11,113 | .263 | 85,250 | 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 | 9,304 | 4,466 | 4,830 | .480 | -364 | 6 | 5 | 2 | 9 | 1109 | 15 | 38,129 | 315,145 | 78,825 | 7,722 | .250 | 39,141 | 3.79 |
19 | New York Yankees | 1903 | 2020 | 18,345 | 10,399 | 7,858 | .570 | 2541 | 19 | 40 | 27 | 55 | 1709 | 46 | 89,226 | 625,849 | 166,742 | 16,273 | .266 | 76,613 | 3.65 |
| Also played as New York Highlanders |
20 | Oakland Athletics | 1901 | 2020 | 18,603 | 9,051 | 9,465 | .489 | -414 | 16 | 15 | 9 | 28 | 1984 | 41 | 82,458 | 631,132 | 163,122 | 13,355 | .258 | 84,872 | 3.98 |
| Also played as Kansas City Athletics and Philadelphia Athletics |
| Philadelphia Athletics, see Oakland Athletics |
21 | Philadelphia Phillies | 1883 | 2020 | 20,975 | 9,844 | 11,016 | .472 | -1172 | 12 | 7 | 2 | 14 | 2097 | 35 | 92,938 | 718,006 | 187,164 | 13,291 | .261 | 98,913 | 3.98 |
| Also played as Philadelphia Quakers |
22 | Pittsburgh Pirates | 1882 | 2020 | 21,128 | 10,557 | 10,431 | .503 | 126 | 9 | 9 | 5 | 17 | 2008 | 40 | 94,395 | 724,489 | 191,433 | 11,594 | .264 | 93,947 | 3.73 |
| Also played as Pittsburgh Alleghenys |
23 | San Diego Padres | 1969 | 2020 | 8,179 | 3,771 | 4,406 | .461 | -635 | 5 | 2 | 0 | 5 | 1047 | 12 | 32,808 | 276,700 | 69,033 | 6,468 | .249 | 35,973 | 3.97 |
24 | San Francisco Giants | 1883 | 2020 | 21,055 | 11,184 | 9,708 | .535 | 1476 | 8 | 23 | 8 | 26 | 1831 | 57 | 97,478 | 719,076 | 189,708 | 14,735 | .264 | 90,220 | 3.58 |
| Also played as New York Giants and New York Gothams |
25 | Seattle Mariners | 1977 | 2020 | 6,882 | 3,236 | 3,644 | .470 | -408 | 3 | 0 | 0 | 4 | 890 | 6 | 30,610 | 235,378 | 61,107 | 6,855 | .260 | 32,442 | 4.34 |
| Seattle Pilots, see Milwaukee Brewers |
| St. Louis Browns, see Baltimore Orioles |
26 | St. Louis Cardinals | 1882 | 2020 | 21,164 | 10,934 | 10,078 | .520 | 856 | 14 | 23 | 11 | 29 | 2143 | 47 | 97,142 | 725,970 | 193,269 | 12,327 | .266 | 93,202 | 3.67 |
| Also played as St. Louis Perfectos, St. Louis Browns and St. Louis Brown Stockings |
27 | Tampa Bay Rays | 1998 | 2020 | 3,602 | 1,713 | 1,889 | .476 | -176 | 2 | 1 | 0 | 5 | 509 | 1 | 15,914 | 122,733 | 31,409 | 3,687 | .256 | 16,803 | 4.32 |
| Also played as Tampa Bay Devil Rays |
28 | Texas Rangers | 1961 | 2020 | 9,456 | 4,513 | 4,937 | .478 | -424 | 7 | 2 | 0 | 8 | 1158 | 8 | 42,627 | 323,103 | 83,735 | 9,344 | .259 | 44,572 | 4.28 |
| Also played as Washington Senators |
29 | Toronto Blue Jays | 1977 | 2020 | 6,883 | 3,404 | 3,476 | .495 | -72 | 6 | 2 | 2 | 7 | 839 | 8 | 31,785 | 236,075 | 61,484 | 7,384 | .260 | 31,654 | 4.24 |
30 | Washington Nationals | 1969 | 2020 | 8,168 | 3,991 | 4,173 | .489 | -182 | 5 | 1 | 1 | 6 | 957 | 10 | 34,221 | 276,532 | 70,247 | 6,932 | .254 | 35,061 | 3.88 |
| Also played as Montreal Expos |
| Washington Senators (1901-1960), see Minnesota Twins |
| Washington Senators (1961-1971), see Texas Rangers |
Earlier Franchises