I have :

 Giant Eagle
 Kroger
 Wal-Mart
 Target
 ALDI
 GFS
 There's others around but these are what's in Grove City . Truthfully , the only one I really use is Giant Eagle .
 

In Southern California, we have:

Kroger
- Ralphs
- Food4Less
Albertsons
- Vons
- Albertsons
- Pavilions
Amazon
- Whole Foods
- Amazon Fresh
Stater Bros.
Bristol Farms
Sprouts
Gelson’s

Specialty Grocers:

Aldi
- Aldi
- Trader Joe’s

(That’s excluding Hispanic-oriented, discount stores, or wholesale.)

Probably our biggest is Morrisons in our town, however they’re starting to get ridiculously expensive now, unfortunately our nearest ASDA, (Morrisons immediate competition), in in the next town, this particular ASDA store was once the mighty FINE FAIR back in the glorious 80s, lit with about 70 kWs of one thousand watt mercury lamps! 😎
We’re starting to use Home Bargains more now as they’re about £2 cheaper than Morrisons on virtually everything!
We also have LIDL and TESCO in our town, with TESCOs being as equally expensive as Morrisons! 😵‍💫

If you can be bothered to drive 8 miles from our town to Crewe though, they have a place called The Food Warehouse!, this place is amazing!, we did our Christmas shop here and got a trolley full for about £214!, if you fill the same trolley and Morrisons, your looking at £350 and upwards! 😵‍💫

Where I live here in Southern California:

Walmart Neighborhood Market
Aldi (2)
Albertsons
Vons (3)
Stater Bros
Ralphs
Trader Joes
Target (2)
Sprouts
Smart and Final (2)
Vallarta Supermarket (Mexican food store)
Grocery Outlet
Walmart (general merchandise store, with a slightly smaller supermarket section than supercenters)
Lassens Natural Foods a small chain in So Cal

In North Carolina, we have...

-Target
-Walmart
-Harris Teeter
-Trader Joes
-Aldi
-Lidl
-Food Lion
-Costco
-Whole Foods
-Earth Fare (Very few left)
-Publix (Not a lot)

We used to have Harris Teeter a while back at East Cobb, now it has been replaced with LA Fitness

We have them everywhere, they are headquartered in Mathews, North Carolina-

Here in Southeastern PA, we have a pretty decent variety of supermarket offerings. These aren't all in my town, but they're within a five mile radius from home.

Nearest to me (in my town) are an Acme (which was formerly a SuperFresh) and a GIANT (which replaced a closed local IGA market. )

Current Offerings:
Walmart
Target
GIANT
Stop & Shop
Acme (owned by Albertsons)
Trader Joe's
Wegmans (2 - one just opened on the site of a former farm about two miles down the road, while the other is in NJ but still close enough to be considered local)
Whole Foods
IGA
Amazon Fresh (about three new locations opened recently, but last year all of their stores save for one, the original pilot, were abandoned in place, entirely finished, except for a sign above the door for at minimum a year until shopping centers and municipal governments sued them to open)
Shoprite
Weis
Aldi
Lidl
BJ's
Costco
Sam's Club


Former Offerings:
Bottom Dollar Foods
SuperFresh
Many IGAs, particularly the one down the road

In Reading, Berkshire, UK we have:

Sainsburys
IKEA
ASDA (2 big stores)
TESCO (2 big stores)
Morrisons
Costco
Waitrose
CO-OP/CO-Operative
Ocado (online only)
M&S
ICELAND
ALdi
Lidl
Poundland

I found out that the Winn Dixie closer to me is going to convert to an Aldi eventually, my guess in the next 6-12 months.

The other two remaining Winn Dixie stores in my county are staying Winn Dixie permanently.

So I’ll have an Aldi closer to me, which could be convenient, but if I want to go to Winn Dixie, I’ll have to drive to the further ones.

I’m just glad Aldi isn’t going to convert all the ones here, because they’ve kind of gotten annoying about doing that. Lots of areas don’t have any left.

Few years ago, all of the Caltex servos (gas station for you Americans!) converted to Ampols. I have no idea why, but that's something interesting.