How Many Teams in Baseball? MLB Has 30 Teams

By Sarah Miller · October 9, 2038

There are 30 teams in Major League Baseball (MLB), divided equally between the American League (AL) and National League (NL), each with 15 teams. These 30 franchises are further organized into six divisions—three in each league—and compete annually for a spot in the MLB postseason.

Understanding MLB's Team Structure

Major League Baseball (MLB) is the premier professional baseball league in North America and consists of 30 teams across the United States and Canada. This structure has remained consistent since 1998, when the Arizona Diamondbacks and Tampa Bay Devil Rays (now Tampa Bay Rays) joined as expansion teams.

Key Components of MLB's Organization

Two Leagues: American League (AL) and National League (NL)
Six Divisions: Three per league—East, Central, West
30 Total Teams: 15 in each league
Geographic Spread: Teams located across the U.S., with one team based in Canada (Toronto Blue Jays)

History of MLB Expansion

MLB has evolved significantly since its inception in 1901. Initially composed of just eight teams, the league gradually expanded to meet growing fan interest and market opportunities.

Milestones in Team Growth

1961: AL adds Los Angeles Angels and Washington Senators (second iteration)
1962: NL introduces Houston Colt .45s (later Astros) and New York Mets
1977: Seattle Mariners (AL) and Toronto Blue Jays (AL) join; first Canadian team
1993: Colorado Rockies (NL) and Florida Marlins (now Miami Marlins) added
1998: Final expansion with Arizona Diamondbacks (NL) and Tampa Bay Rays (AL)

League	Division	Team	City/State	Founded	Joined MLB
American League	East	Boston Red Sox	Boston, MA	1901	1901
American League	East	New York Yankees	New York, NY	1901	1901
American League	East	Tampa Bay Rays	St. Petersburg, FL	1998	1998
National League	West	Los Angeles Dodgers	Los Angeles, CA	1883	1958
National League	West	Arizona Diamondbacks	Phoenix, AZ	1998	1998
American League	Central	Kansas City Royals	Kansas City, MO	1969	1969
National League	Central	Milwaukee Brewers	Milwaukee, WI	1969	1998 (from AL)
American League	East	Toronto Blue Jays	Toronto, ON	1977	1977

Table data source:1, 2

The table illustrates the diversity in founding years and entry dates into MLB, highlighting both historical franchises and modern expansions. Notably, the Milwaukee Brewers began in the AL before moving to the NL in 1998. The presence of the Toronto Blue Jays underscores MLB’s international reach.

Current MLB Divisional Alignment

Each league is split into three divisions: East, Central, and West. This alignment balances regional competition and travel logistics.

American League Overview

AL East: Boston Red Sox, New York Yankees, Tampa Bay Rays, Baltimore Orioles, Toronto Blue Jays
AL Central: Cleveland Guardians, Detroit Tigers, Kansas City Royals, Minnesota Twins, Chicago White Sox
AL West: Houston Astros, Los Angeles Angels, Oakland Athletics, Seattle Mariners, Texas Rangers

National League Overview

NL East: Atlanta Braves, Miami Marlins, New York Mets, Philadelphia Phillies, Washington Nationals
NL Central: Chicago Cubs, Cincinnati Reds, Milwaukee Brewers, Pittsburgh Pirates, St. Louis Cardinals
NL West: Arizona Diamondbacks, Colorado Rockies, Los Angeles Dodgers, San Diego Padres, San Francisco Giants

Future Expansion Possibilities

While there are currently 30 teams, MLB has expressed interest in potential future expansion. Cities like Nashville, Montreal, and Portland have been mentioned as possible markets for new franchises.

Expansion would likely bring the total to 32 teams, allowing for balanced four-division structures or realignment. However, no official timeline has been announced as of 2025.

Frequently Asked Questions About MLB Teams

How many baseball teams are in MLB?

There are 30 teams in Major League Baseball (MLB), with 15 in the American League and 15 in the National League.

Why does MLB have 30 teams?

MLB expanded to 30 teams in 1998 with the addition of the Arizona Diamondbacks and Tampa Bay Rays, balancing geographic coverage and competitive structure across the U.S. and Canada.

Which league has more teams in MLB?

Neither league has more teams—both the American League and National League have exactly 15 teams, ensuring parity in scheduling and playoff qualification.

Are there any MLB teams outside the United States?

Yes, the Toronto Blue Jays are based in Toronto, Ontario, Canada. They are the only MLB team located outside the United States.

Has MLB ever had fewer than 30 teams?

Yes, MLB had fewer than 30 teams throughout most of its history. The league reached 30 teams only in 1998 after several phases of expansion beginning in the 1960s.