Here's where Americans are buying their groceries

A battle is heating up between America's top grocers, and so far, there are only a couple clear winners.

Walmart and its warehouse chain, Sam's Club, are the most dominant supermarkets in the country, accounting for more than a fifth of the grocery market share, according to data compiled by UBS.

The rest of the market is highly fragmented and split between dozens of other players, including Kroger (10%), Albertsons (5.2%) and Costco (4.2%).

RELATED: Check out the most popular grocery store in every state:

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The most popular grocery store in every state
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The most popular grocery store in every state

ALABAMA: Publix 

Photo credit: Getty

ALASKA: Safeway 

Photo credit: Reuters 

ARIZONA: FrysFoodStores 

Photo credit: Getty

ARKANSAS: Harps Food Stores

Photo credit: Getty

CALIFORNIA: Trader Joe's

Photo credit: Getty

COLORADO: King Soopers

Photo credit: Getty

CONNECTICUT: Whole Foods Market 

Photo credit: Reuters 

DELAWARE: Food Lion Grocery Store 

Photo credit: Getty

WASHINGTON, D.C.: Whole Foods Market

Photo credit: Getty

FLORIDA: Publix 

Photo credit: Getty

GEORGIA: Publix 

Photo credit: Getty

HAWAII: Safeway 

Photo credit: Getty

IDAHO: Albertsons

Photo credit: Getty

ILLINOIS: Jewel 

Photo credit: Getty

INDIANA: Kroger 

Photo credit: Getty

IOWA: Hy-Vee 

Photo credit: Getty 

KANSAS: Hy-Vee

Photo credit: Getty

KENTUCKY: Kroger 

Photo credit: Getty

LOUISIANA: Rouses Markets 

Photo credit: Getty

MAINE: Shaw's 

Photo credit: Getty

MARYLAND: Safeway 

Photo credit: Getty

MASSACHUSETTS: Whole Foods Market 

Photo credit: Reuters 

MICHIGAN: Kroger 

Photo credit: Getty

MINNESOTA: Cub Foods 

Photo credit: Reuters 

MISSISSIPPI: Kroger 

Photo credit: Getty 

MISSOURI: Hy-Vee 

Photo credit: Getty

MONTANA: Albertsons

Photo credit: Getty

NEBRASKA: Hy-Vee

Photo credit: Getty

NEVADA: Albertsons

Photo credit: Getty

NEW HAMPSHIRE: Shaw's 

Photo credit: Getty

NEW HAMPSHIRE: Shaw's 

Photo credit: Getty

NEW MEXICO: Albertsons

Photo credit: Getty

NEW YORK: Whole Foods Market

Photo credit: Getty

NORTH CAROLINA: Food Lion Grocery Store

Photo credit: Getty

NORTH DAKOTA: Hombacher's

Photo credit: AOL

OHIO: Kroger 

Photo credit: Getty 

OKLAHOMA: Homeland Stores

Photo credit: Getty

OREGON: Safeway 

Photo credit: Getty

PENNSYLVANIA: Wegmans Food Markets

Photo credit: Getty

RHODE ISLAND: Shaw's

Photo credit: Shutterstock

SOUTH CAROLINA

Photo credit: Getty

SOUTH DAKOTA: Hy-Vee 

Photo credit: Getty

TENNESSEE: Publix

Photo credit: Getty

TEXAS: H-E-B 

Photo credit: Getty

UTAH: Smith's

Photo credit: Getty

VERMONT: Shaw's 

Photo credit: Getty

VIRGINIA: Food Lion Grocery Store 

Photo credit: Getty

WASHINGTON: Safeway

Photo credit: Reuters 

WEST VIRGINIA: Food Lion Grocery Store

Photo credit: Getty

WISCONSIN: Pick 'n Save 

Photo credit: Getty

WYOMING: Albertsons

Photo credit: Getty

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Shares of grocery companies were rattled last week after it emerged that Amazon plans to acquire Whole Foods in a $13.7 billion deal. So it may come as a shock to some that Whole Foods controls just 1.4% of the market, making it the 13th largest grocery chain in America. Amazon, meanwhile, claims just 0.2% of the grocery market.

The discount store Aldi recently claimed that it will be the third largest grocery chain in the US within the next four years, thanks to an aggressive expansion plan. But for now, it claims just 1.1% of the market.

Here's the top grocery chains in America, according to UBS:

US grocery marketUBS

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See Also:
Walmart should still terrify Amazon and Whole Foods
Scott Galloway explains exactly why Amazon would buy Whole Foods (when he predicted it last month)
Here's the letter Whole Foods just sent its customers who are furious about it 'selling out'

SEE ALSO: A grocery chain many Americans have never heard of is about to be one of the biggest in the US

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