I wasn't super surprised about this.

RealSimple.com published each state's most popular Costco product (full article)

Utah's is Kirkland Signature Diapers.

Here's the full list of states:

Alabama: Kirkland Signature Premium Paper Towels
Alaska:
 Kirkland Signature Premium Paper Towels
Arizona:
 Kirkland Signature Prosecco
Arkansas: 
N/A
California:
 Kirkland Signature Prosecco
Colorado: 
Kirkland Signature Maple Syrup
Connecticut:
 Woozoo Globe Fan
Delaware:
 Kirkland Signature French Vodka
Florida: 
Kirkland Signature Three Berry Blend
Georgia:
 Goodles Cheddy Mac White Cheddar Shells
Hawaii:
 Woozoo Globe Fan
Idaho:
 Kirkland Signature Italian-Style Beef Meatballs
Illinois:
 Kirkland Signature Prosecco
Indiana:
 Kirkland Signature Stretch Tite Plastic Food Wrap
Iowa: 
Sanders Small Batch Wonders Sea Salt Caramel
Kansas: 
N/A
Kentucky:
 Reese's Dipped Animal Crackers
Louisiana: 
N/A
Maine: 
Kirkland Signature Premium Bath Tissue
Maryland: 
Kirkland Signature Three Berry Blend
Massachusetts:
 Trident Fish Sticks
Michigan: 
Kirkland Signature French Vodka
Minnesota: 
Sutton Place Cooling Throw
Mississippi:
 Goodles Cheddy Mac White Cheddar Shells
Missouri:
 General Mills Morning Summit Cereal
Montana: 
Reese’s Dipped Animal Crackers
Nebraska:
 Reese's Dipped Animal Crackers
Nevada:
 Kirkland Signature Organic No-Salt Seasoning
New Hampshire:
 Costco Fresh Berries
New Jersey:
 Kirkland Signature Stretch Tite Plastic Food Wrap
New Mexico:
 Kirkland Signature Leggings
New York:
 Goodles Cheddy Mac White Cheddar Shells
North Carolina:
 N/A
North Dakota: 
Food Court Hotdog/Soda Combo
Ohio:
 Goodles Cheddy Mac White Cheddar Shells
Oklahoma:
 N/A
Oregon:
 Bibigo Cooked Sticky Rice
Pennsylvania:
 General Mills Morning Summit Cereal
Rhode Island:
 N/A
South Carolina:
 Kirkland Signature Maple Syrup
South Dakota:
 Kirkland Signature Italian-Style Beef Meatballs
Tennessee:
 La Terra Fina Spinach Artichoke & Parmesan Dip & Spread
Texas:
 General Mills Morning Summit Cereal
Vermont:
 Costco Fresh Berries
Virginia: 
Trident Fish Sticks
Washington:
 Trident Fish Sticks
West Virginia: 
N/A
Wisconsin:
 Sutton Place Cooling Throw
Wyoming:
 N/A

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