It's because some of these states have 2 or more major cities in the same market.
New Jersey Nets=Newark, Trenton et al.
Golden State Warriors=San Fransisco, Oakland and San Jose
Minnesota Timberwolves=Minneapolis and Saint Paul
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Most NFL teams are named after a City.
City: 26 teams -
Buffalo, Miami, New York Jets, Baltimore, Pittsburgh, Cleveland, Cincinnati, Jacksonville, Houston, Indianapolis, Denver, Oakland, Kansas City, Los Angeles Chargers, New York Giants, Dallas, Philadelphia, Washington, San Francisco, Seattle, Los Angeles Rams, Detroit, Green Bay, Chicago, Atlanta, New Orleans,
State: 3 - Tennessee, Arizona, Minnesota
Region: 2 - New England, Carolina
Body of Water: 1 - Tampa Bay