Interstate 90 Business may refer to several business routes of the Interstate Highway System that connects Interstate 90 with the central business district

Central business district

A central business district is the commercial and often geographic heart of a city. In North America this part of a city is commonly referred to as "downtown" or "city center"...

 of various cities bypassed by I-90. Each business route can be either a business loop or a business spur, depending on whether both ends connect to I-90. The business route in each community is considered a unique route. In many cases, these routes are a former section of a U.S. Route

United States Numbered Highways

The system of United States Numbered Highways is an integrated system of roads and highways in the United States numbered within a nationwide grid...

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Washington

• Interstate 90 Business (Ellensburg, Washington)
• Interstate 90 Business (Moses Lake, Washington)
• Interstate 90 Business (Spokane, Washington)

Idaho

• Interstate 90 Business (Coeur d'Alene, Idaho)
  Interstate 90 Business (Coeur D'Alene, Idaho)
  Interstate 90 Business is a Business loop of Interstate 90 in Coeur D'Alene. The route links I-90, which bypasses downtown Coeur D'Alene to the north, and downtown Coeur D'Alene. As its Business Loop designation implies, I-90 Business terminates at I-90 at each end.- Route description :I-90...
  
  
• Interstate 90 Business (Mullan, Idaho)
• Interstate 90 Business (Osburn, Idaho)
• Interstate 90 Business (Post Falls, Idaho)
  Interstate 90 Business (Post Falls, Idaho)
  Interstate 90 Business is a Business loop of Interstate 90 in Post Falls. The route links I-90, which bypasses downtown Post Falls to the south, and downtown Post Falls. As its Business Loop designation implies, I-90 Business terminates at I-90 at each end....
  
  
• Interstate 90 Business (Wallace, Idaho)
  Interstate 90 Business (Wallace, Idaho)
  Interstate 90 Business is a Business loop of Interstate 90 in Wallace. The route links I-90, which goes north of the city, and downtown Wallace. As its Business Loop designation implies, I-90 Business terminates at I-90 at each end...
  
  

Montana

• Interstate 90 Business (Missoula, Montana)
• Interstate 90 Business (Deer Lodge, Montana)
• Interstate 90 Business (Butte, Montana) (concurrent with Interstate 15 Business (Butte, Montana))
• Interstate 90 Business (Bozeman, Montana)
• Interstate 90 Business (Livingston, Montana)
• Interstate 90 Business (Big Timber, Montana)
• Interstate 90 Business (Laurel, Montana)
• Interstate 90 Business (Billings, Montana)
• Interstate 90 Business (Hardin, Montana)

Wyoming

• Interstate 90 Business (Buffalo, Wyoming)
• Interstate 90 Business (Gillette, Wyoming)
• Interstate 90 Business (Sheridan, Wyoming)
• Interstate 90 Business (Sundance, Wyoming)

South Dakota

• Interstate 90 Business (Spearfish, South Dakota)
• Interstate 90 Business (Sturgis, South Dakota)
• Interstate 90 Business (Rapid City, South Dakota)
• Interstate 90 Business (Wall, South Dakota)
• Interstate 90 Business (Kadoka, South Dakota)
• Interstate 90 Business (Belvidere, South Dakota)
• Interstate 90 Business (Murdo, South Dakota)
• Interstate 90 Business (Vivian, South Dakota)
• Interstate 90 Business (Presho, South Dakota)
• Interstate 90 Business (Chamberlain, South Dakota)
• Interstate 90 Business (White Lake, South Dakota)
• Interstate 90 Business (Plankinton, South Dakota)
• Interstate 90 Business (Mitchell, South Dakota)
• Interstate 90 Business (Sioux Falls, South Dakota)

Minnesota

• Interstate 90 Business (Worthington, Minnesota)
• Interstate 90 Business (Fairmont, Minnesota)
• Interstate 90 Business (Austin, Minnesota)