| | Anaheim Angels, see Los Angeles Angels |
| 1 | Arizona Diamondbacks | 1998 | 2021 | 3,664 | 1,806 | 1,858 | .493 | -52 | 5 | 1 | 1 | 6 | 520 | 2 | 16,686 | 125,341 | 32,131 | 3,898 | .256 | 16,819 | 4.23 |
| 2 | Atlanta Braves | 1876 | 2021 | 21,609 | 10,751 | 10,704 | .501 | 47 | 20 | 17 | 3 | 26 | 2041 | 53 | 96,273 | 740,006 | 192,302 | 14,061 | .260 | 95,416 | 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 | 2021 | 18,705 | 8,809 | 9,786 | .474 | -977 | 9 | 7 | 3 | 14 | 1883 | 34 | 80,639 | 635,492 | 164,279 | 13,633 | .259 | 85,950 | 4.04 |
| | Also played as St. Louis Browns and Milwaukee Brewers |
| | Boston Braves, see Atlanta Braves |
| 4 | Boston Red Sox | 1901 | 2021 | 18,694 | 9,651 | 8,960 | .519 | 691 | 10 | 14 | 9 | 24 | 1848 | 37 | 87,266 | 639,796 | 170,958 | 13,844 | .267 | 83,665 | 3.91 |
| | Also played as Boston Americans |
| | Brooklyn Dodgers, see Los Angeles Dodgers |
| | California Angels, see Los Angeles Angels |
| 5 | Chicago Cubs | 1876 | 2021 | 21,645 | 11,034 | 10,450 | .514 | 584 | 8 | 17 | 3 | 21 | 2131 | 45 | 99,685 | 741,132 | 194,478 | 14,493 | .262 | 96,121 | 3.68 |
| | Also played as Chicago Orphans, Chicago Colts and Chicago White Stockings |
| 6 | Chicago White Sox | 1901 | 2021 | 18,699 | 9,341 | 9,255 | .502 | 86 | 5 | 6 | 3 | 10 | 1813 | 32 | 81,488 | 633,294 | 164,856 | 11,641 | .260 | 81,147 | 3.78 |
| 7 | Cincinnati Reds | 1882 | 2021 | 21,228 | 10,648 | 10,441 | .505 | 207 | 10 | 10 | 5 | 16 | 2044 | 36 | 95,281 | 723,791 | 189,012 | 13,576 | .261 | 94,370 | 3.75 |
| | Also played as Cincinnati Redlegs and Cincinnati Red Stockings |
| 8 | Cleveland Indians | 1901 | 2021 | 18,702 | 9,533 | 9,078 | .512 | 455 | 10 | 6 | 2 | 15 | 1927 | 34 | 84,697 | 637,786 | 169,238 | 13,274 | .265 | 82,554 | 3.83 |
| | Also played as Cleveland Naps, Cleveland Bronchos and Cleveland Blues |
| 9 | Colorado Rockies | 1993 | 2021 | 4,413 | 2,074 | 2,339 | .470 | -265 | 0 | 1 | 0 | 5 | 603 | 1 | 22,264 | 151,934 | 41,573 | 5,054 | .274 | 23,322 | 4.98 |
| 10 | Detroit Tigers | 1901 | 2021 | 18,727 | 9,383 | 9,251 | .504 | 132 | 7 | 11 | 4 | 16 | 1728 | 24 | 86,303 | 639,012 | 169,405 | 13,940 | .265 | 85,888 | 4.00 |
| 11 | Houston Astros | 1962 | 2021 | 9,372 | 4,653 | 4,714 | .497 | -61 | 10 | 3 | 1 | 14 | 936 | 10 | 39,609 | 317,954 | 80,984 | 7,582 | .255 | 39,495 | 3.81 |
| | Also played as Houston Colt .45s |
| | Kansas City Athletics, see Oakland Athletics |
| 12 | Kansas City Royals | 1969 | 2021 | 8,224 | 3,945 | 4,277 | .480 | -332 | 8 | 4 | 2 | 9 | 930 | 4 | 36,097 | 281,724 | 74,335 | 6,375 | .264 | 37,919 | 4.24 |
| 13 | Los Angeles Angels | 1961 | 2021 | 9,529 | 4,751 | 4,775 | .499 | -24 | 9 | 1 | 1 | 10 | 1121 | 12 | 41,331 | 323,619 | 83,226 | 8,421 | .257 | 41,659 | 3.98 |
| | Also played as Los Angeles Angels of Anaheim, Anaheim Angels and California Angels |
| 14 | Los Angeles Dodgers | 1884 | 2021 | 21,030 | 11,039 | 9,852 | .528 | 1187 | 19 | 25 | 7 | 34 | 1871 | 50 | 94,427 | 716,631 | 187,370 | 13,168 | .261 | 89,160 | 3.53 |
| | Also played as Brooklyn Dodgers, Brooklyn Robins, Brooklyn Superbas, Brooklyn Bridegrooms, Brooklyn Grooms, Brooklyn Grays and Brooklyn Atlantics |
| 15 | Miami Marlins | 1993 | 2021 | 4,403 | 2,038 | 2,365 | .463 | -327 | 0 | 2 | 2 | 3 | 643 | 5 | 18,735 | 149,890 | 38,454 | 3,982 | .257 | 20,461 | 4.31 |
| | Also played as Florida Marlins |
| | Milwaukee Braves, see Atlanta Braves |
| 16 | Milwaukee Brewers | 1969 | 2021 | 8,234 | 3,962 | 4,268 | .481 | -306 | 4 | 1 | 0 | 7 | 944 | 7 | 36,480 | 279,859 | 72,001 | 7,954 | .257 | 37,680 | 4.18 |
| | Also played as Seattle Pilots |
| | Milwaukee Brewers (1901), see Baltimore Orioles |
| 17 | Minnesota Twins | 1901 | 2021 | 18,712 | 8,952 | 9,651 | .481 | -699 | 12 | 6 | 3 | 17 | 1732 | 25 | 82,205 | 638,592 | 167,852 | 11,198 | .263 | 85,510 | 3.99 |
| | Also played as Washington Senators |
| | Montreal Expos, see Washington Nationals |
| | New York Giants, see San Francisco Giants |
| 18 | New York Mets | 1962 | 2021 | 9,357 | 4,492 | 4,857 | .480 | -365 | 6 | 5 | 2 | 9 | 1129 | 15 | 38,351 | 316,893 | 79,264 | 7,783 | .250 | 39,377 | 3.79 |
| 19 | New York Yankees | 1903 | 2021 | 18,405 | 10,433 | 7,884 | .570 | 2549 | 19 | 40 | 27 | 56 | 1716 | 46 | 89,511 | 627,825 | 167,209 | 16,361 | .266 | 76,851 | 3.65 |
| | Also played as New York Highlanders |
| 20 | Oakland Athletics | 1901 | 2021 | 18,668 | 9,088 | 9,493 | .489 | -405 | 17 | 15 | 9 | 29 | 1996 | 41 | 82,728 | 633,189 | 163,580 | 13,431 | .258 | 85,142 | 3.98 |
| | Also played as Kansas City Athletics and Philadelphia Athletics |
| | Philadelphia Athletics, see Oakland Athletics |
| 21 | Philadelphia Phillies | 1883 | 2021 | 21,040 | 9,874 | 11,051 | .472 | -1177 | 12 | 7 | 2 | 14 | 2112 | 35 | 93,217 | 720,109 | 187,676 | 13,362 | .261 | 99,212 | 3.98 |
| | Also played as Philadelphia Quakers |
| 22 | Pittsburgh Pirates | 1882 | 2021 | 21,189 | 10,581 | 10,468 | .503 | 113 | 9 | 9 | 5 | 17 | 2031 | 40 | 94,600 | 726,459 | 191,874 | 11,644 | .264 | 94,219 | 3.73 |
| | Also played as Pittsburgh Alleghenys |
| 23 | San Diego Padres | 1969 | 2021 | 8,238 | 3,807 | 4,429 | .462 | -622 | 5 | 2 | 0 | 6 | 1065 | 12 | 33,072 | 278,614 | 69,490 | 6,529 | .249 | 36,166 | 3.96 |
| 24 | San Francisco Giants | 1883 | 2021 | 21,114 | 11,217 | 9,734 | .535 | 1483 | 8 | 23 | 8 | 26 | 1847 | 57 | 97,736 | 720,969 | 190,151 | 14,815 | .264 | 90,442 | 3.58 |
| | Also played as New York Giants and New York Gothams |
| 25 | Seattle Mariners | 1977 | 2021 | 6,943 | 3,266 | 3,675 | .471 | -409 | 3 | 0 | 0 | 4 | 906 | 6 | 30,860 | 237,290 | 61,503 | 6,923 | .259 | 32,720 | 4.34 |
| | Seattle Pilots, see Milwaukee Brewers |
| | St. Louis Browns, see Baltimore Orioles |
| 26 | St. Louis Cardinals | 1882 | 2021 | 21,231 | 10,971 | 10,108 | .520 | 863 | 14 | 23 | 11 | 30 | 2150 | 47 | 97,423 | 728,076 | 193,749 | 12,402 | .266 | 93,478 | 3.68 |
| | Also played as St. Louis Perfectos, St. Louis Browns and St. Louis Brown Stockings |
| 27 | Tampa Bay Rays | 1998 | 2021 | 3,663 | 1,748 | 1,915 | .477 | -167 | 3 | 2 | 0 | 6 | 522 | 1 | 16,177 | 124,760 | 31,865 | 3,755 | .255 | 17,031 | 4.31 |
| | Also played as Tampa Bay Devil Rays |
| 28 | Texas Rangers | 1961 | 2021 | 9,519 | 4,540 | 4,973 | .477 | -433 | 7 | 2 | 0 | 8 | 1177 | 8 | 42,887 | 325,178 | 84,224 | 9,423 | .259 | 44,869 | 4.28 |
| | Also played as Washington Senators |
| 29 | Toronto Blue Jays | 1977 | 2021 | 6,942 | 3,436 | 3,503 | .495 | -67 | 6 | 2 | 2 | 8 | 852 | 8 | 32,083 | 238,049 | 61,974 | 7,463 | .260 | 31,945 | 4.24 |
| 30 | Washington Nationals | 1969 | 2021 | 8,225 | 4,018 | 4,203 | .489 | -185 | 5 | 1 | 1 | 6 | 970 | 10 | 34,472 | 278,402 | 70,724 | 6,987 | .254 | 35,316 | 3.89 |
| | Also played as Montreal Expos |
| | Washington Senators (1901-1960), see Minnesota Twins |
| | Washington Senators (1961-1971), see Texas Rangers |
Earlier Franchises