Number three is Walmart

The third largest retailer for hardware and home improvement products in the USA is not a DIY store chain: it's Walmart. The largest mass merchant of the country makes around USD 15.58 bn in the hardlines segment - to a large extent in the field of lawn and garden, estimates the American trade journal HBS Dealer, who has published a list of the top 300 retail companies. Amazon appears in the list at tenth place with USD 4.65 bn sales in the hardlines segment; however 58 per cent of Amazon sales, according to reports by the company, are booked to the accounts of third-party traders.
The ranking is based on figures from 2018. Home Depot is at the top with USD 108.2 bn, followed by Lowe's with USD 71.3 bn. Menards is at rank four with USD 10.7 bn. These three companies are listed in the home centre category. The next home centre company on the list, Central Network, follows much lower down with USD 350 mio annual sales. Between them are companies from the categories farm/ranch, lumber/building material and hardware. The first hardware chain on the list is Harbor Freight Tools with USD 2.95 bn. By the way, position 300 is held by Stone's Home Center in Bainbridge, Georgia, with sales of USD 35.5 mio.

The magazine's listing for each firm showed sales, number of stores and the type of business. In the accompanying list of 20 retailers, we have selected some home center and hardware chains, plus several retailers whose business is hardlines-oriented, such as Tractor Supply, which caters to the farm and ranch trade and which carries merchandise from most of the categories found in a hardware store. In addition to the data compiled by HBS Dealer, we have calculated the average sales-per-store.
Some of these retailers do not carry anywhere near as extensive and broad inventory of hardlines products as do hardware stores. Some of these non-hardware retailers will carry a relatively few products in some categories (electrical or plumbing, for example). In the home center field, both Home Depot and Lowe's are significant players in the major appliance business, whereas most other home centers, especially smaller firms, simply do not rack up those big-ticket sales so their overall volume always is much less.