| | Anaheim Angels, see Los Angeles Angels |
| 1 | Arizona Diamondbacks | 1998 | 2026 | 4,508 | 2,205 | 2,303 | .489 | -98 | 5 | 2 | 1 | 7 | 656 | 2 | 20,608 | 153,700 | 39,102 | 4,825 | .254 | 20,906 | 4.29 |
| 2 | Athletics | 1901 | 2026 | 19,512 | 9,442 | 9,983 | .486 | -541 | 17 | 15 | 9 | 29 | 2160 | 43 | 86,177 | 661,435 | 170,220 | 14,400 | .257 | 89,318 | 4.01 |
| | Also played as Oakland Athletics, Kansas City Athletics and Philadelphia Athletics |
| 3 | Atlanta Braves | 1876 | 2026 | 22,452 | 11,236 | 11,062 | .504 | 174 | 23 | 18 | 4 | 30 | 2183 | 56 | 100,415 | 768,677 | 199,568 | 15,292 | .260 | 98,812 | 3.67 |
| | Also played as Milwaukee Braves, Boston Braves, Boston Bees, Boston, Boston Doves, Boston Nationals and Boston Reds |
| 4 | Baltimore Orioles | 1901 | 2026 | 19,552 | 9,230 | 10,212 | .475 | -982 | 10 | 7 | 3 | 16 | 2038 | 34 | 84,447 | 664,056 | 171,231 | 14,658 | .258 | 89,973 | 4.06 |
| | Also played as St. Louis Browns and Milwaukee Brewers |
| | Boston Braves, see Atlanta Braves |
| 5 | Boston Red Sox | 1901 | 2026 | 19,535 | 10,073 | 9,379 | .518 | 694 | 10 | 14 | 9 | 26 | 1997 | 40 | 91,209 | 668,562 | 178,298 | 14,790 | .267 | 87,529 | 3.92 |
| | Also played as Boston Americans |
| | Brooklyn Dodgers, see Los Angeles Dodgers |
| | California Angels, see Los Angeles Angels |
| 6 | Chicago Cubs | 1876 | 2026 | 22,492 | 11,458 | 10,873 | .513 | 585 | 8 | 17 | 3 | 22 | 2296 | 46 | 103,567 | 769,610 | 201,442 | 15,494 | .262 | 99,889 | 3.70 |
| | Also played as Chicago, Chicago Orphans, Chicago Colts and Chicago White Stockings |
| 7 | Chicago White Sox | 1901 | 2026 | 19,544 | 9,693 | 9,748 | .499 | -55 | 6 | 6 | 3 | 11 | 1979 | 36 | 84,914 | 661,704 | 171,670 | 12,516 | .259 | 85,104 | 3.81 |
| 8 | Cincinnati Reds | 1882 | 2026 | 22,074 | 11,052 | 10,883 | .504 | 169 | 10 | 10 | 5 | 17 | 2202 | 38 | 99,026 | 752,037 | 195,800 | 14,533 | .260 | 98,307 | 3.77 |
| | Also played as Cincinnati Redlegs and Cincinnati |
| 9 | Cleveland Guardians | 1901 | 2026 | 19,549 | 9,980 | 9,478 | .513 | 502 | 13 | 6 | 2 | 18 | 2037 | 37 | 88,272 | 666,059 | 176,068 | 14,105 | .264 | 86,047 | 3.83 |
| | Also played as Cleveland Indians, Cleveland Naps, Cleveland Napoleons, Cleveland Blues and Cleveland |
| 10 | Colorado Rockies | 1993 | 2026 | 5,257 | 2,392 | 2,865 | .455 | -473 | 0 | 1 | 0 | 5 | 723 | 2 | 25,852 | 180,428 | 48,599 | 5,927 | .269 | 28,114 | 5.05 |
| 11 | Detroit Tigers | 1901 | 2026 | 19,572 | 9,793 | 9,686 | .503 | 107 | 7 | 11 | 4 | 18 | 1844 | 24 | 89,821 | 667,332 | 176,146 | 14,801 | .264 | 89,538 | 4.00 |
| 12 | Houston Astros | 1962 | 2026 | 10,217 | 5,131 | 5,081 | .502 | 50 | 14 | 5 | 2 | 18 | 1044 | 13 | 43,596 | 346,732 | 88,340 | 8,662 | .255 | 42,910 | 3.81 |
| | Also played as Houston Colt .45s |
| | Kansas City Athletics, see Oakland Athletics |
| 13 | Kansas City Royals | 1969 | 2026 | 9,071 | 4,321 | 4,748 | .476 | -427 | 8 | 4 | 2 | 10 | 1047 | 5 | 39,639 | 310,147 | 81,351 | 7,203 | .262 | 41,825 | 4.25 |
| 14 | Los Angeles Angels | 1961 | 2026 | 10,377 | 5,123 | 5,251 | .494 | -128 | 9 | 1 | 1 | 10 | 1295 | 13 | 44,891 | 351,964 | 89,888 | 9,461 | .255 | 45,757 | 4.02 |
| | Also played as Los Angeles Angels of Anaheim, Anaheim Angels and California Angels |
| 15 | Los Angeles Dodgers | 1884 | 2026 | 21,876 | 11,573 | 10,164 | .532 | 1409 | 23 | 27 | 9 | 39 | 2013 | 56 | 98,870 | 745,305 | 194,676 | 14,402 | .261 | 92,401 | 3.53 |
| | Also played as Brooklyn Dodgers, Brooklyn Robins, Brooklyn Superbas, Brooklyn Grooms, Brooklyn and Brooklyn Bridegrooms |
| 16 | Miami Marlins | 1993 | 2026 | 5,249 | 2,419 | 2,830 | .461 | -411 | 0 | 2 | 2 | 4 | 804 | 6 | 22,125 | 178,382 | 45,408 | 4,784 | .255 | 24,378 | 4.31 |
| | Also played as Florida Marlins |
| | Milwaukee Braves, see Atlanta Braves |
| 17 | Milwaukee Brewers | 1969 | 2026 | 9,076 | 4,450 | 4,622 | .491 | -172 | 8 | 1 | 0 | 11 | 1089 | 9 | 40,494 | 308,127 | 78,937 | 8,898 | .256 | 41,020 | 4.13 |
| | Also played as Seattle Pilots |
| | Milwaukee Brewers (1901), see Baltimore Orioles |
| 18 | Minnesota Twins | 1901 | 2026 | 19,561 | 9,365 | 10,087 | .481 | -722 | 13 | 6 | 3 | 18 | 1868 | 29 | 86,022 | 667,209 | 174,819 | 12,255 | .262 | 89,394 | 4.00 |
| | Also played as Washington Senators and Washington Nationals |
| | Montreal Expos, see Washington Nationals |
| | New York Giants, see San Francisco Giants |
| 19 | New York Mets | 1962 | 2026 | 10,209 | 4,933 | 5,268 | .484 | -335 | 6 | 5 | 2 | 11 | 1310 | 19 | 42,198 | 345,377 | 86,256 | 8,829 | .250 | 42,991 | 3.81 |
| 20 | New York Yankees | 1903 | 2026 | 19,249 | 10,917 | 8,244 | .570 | 2673 | 21 | 41 | 27 | 60 | 1847 | 51 | 93,591 | 655,977 | 174,026 | 17,625 | .265 | 80,260 | 3.66 |
| | Also played as New York Highlanders |
| | Oakland Athletics, see Athletics |
| | Philadelphia Athletics, see Oakland Athletics |
| 21 | Philadelphia Phillies | 1883 | 2026 | 21,885 | 10,343 | 11,427 | .475 | -1084 | 14 | 8 | 2 | 18 | 2226 | 39 | 97,202 | 748,754 | 194,887 | 14,447 | .260 | 102,837 | 3.98 |
| | Also played as Philadelphia Phils and Philadelphia |
| 22 | Pittsburgh Pirates | 1882 | 2026 | 22,035 | 10,948 | 10,947 | .500 | 1 | 9 | 9 | 5 | 17 | 2192 | 41 | 97,982 | 754,684 | 198,508 | 12,427 | .263 | 98,230 | 3.76 |
| | Also played as Pittsburgh and Allegheny City |
| 23 | San Diego Padres | 1969 | 2026 | 9,081 | 4,255 | 4,824 | .469 | -569 | 5 | 2 | 0 | 9 | 1197 | 13 | 36,828 | 306,875 | 76,458 | 7,444 | .249 | 39,627 | 3.96 |
| 24 | San Francisco Giants | 1883 | 2026 | 21,959 | 11,653 | 10,143 | .535 | 1510 | 9 | 23 | 8 | 27 | 1990 | 59 | 101,469 | 749,379 | 196,988 | 15,790 | .263 | 94,055 | 3.59 |
| | Also played as New York Giants and New York |
| 25 | Seattle Mariners | 1977 | 2026 | 7,789 | 3,728 | 4,059 | .479 | -331 | 4 | 0 | 0 | 6 | 1052 | 8 | 34,604 | 265,619 | 68,157 | 7,999 | .257 | 36,168 | 4.28 |
| | Seattle Pilots, see Milwaukee Brewers |
| | St. Louis Browns, see Baltimore Orioles |
| 26 | St. Louis Cardinals | 1882 | 2026 | 22,074 | 11,403 | 10,519 | .520 | 884 | 15 | 23 | 11 | 32 | 2250 | 52 | 101,136 | 756,532 | 200,814 | 13,350 | .265 | 97,257 | 3.69 |
| | Also played as St. Louis and St. Louis Browns |
| 27 | Tampa Bay Rays | 1998 | 2026 | 4,503 | 2,209 | 2,294 | .491 | -85 | 4 | 2 | 0 | 9 | 667 | 2 | 20,015 | 153,049 | 38,840 | 4,692 | .254 | 20,453 | 4.21 |
| | Also played as Tampa Bay Devil Rays |
| 28 | Texas Rangers | 1961 | 2026 | 10,362 | 4,934 | 5,422 | .476 | -488 | 7 | 3 | 1 | 9 | 1307 | 12 | 46,586 | 353,657 | 91,090 | 10,397 | .258 | 48,601 | 4.27 |
| | Also played as Washington Senators |
| 29 | Toronto Blue Jays | 1977 | 2026 | 7,789 | 3,892 | 3,894 | .500 | -2 | 7 | 3 | 2 | 11 | 988 | 12 | 36,043 | 266,801 | 69,404 | 8,481 | .260 | 35,593 | 4.22 |
| 30 | Washington Nationals | 1969 | 2026 | 9,075 | 4,370 | 4,701 | .482 | -331 | 5 | 1 | 1 | 6 | 1102 | 10 | 38,114 | 306,933 | 77,820 | 7,812 | .254 | 39,740 | 3.98 |
| | Also played as Montreal Expos |
| | Washington Senators/Nationals (1901-1960), see Minnesota Twins |
| | Washington Senators (1961-1971), see Texas Rangers |
Inactive Franchises