You need to ask Walmart management about it. The Google Map community doesn't have a proper answer for it, and cannot do anything about Walmart business desicions.
There are still tons of Walmart stores open 24-7 so I don’t think it’s cut backs. Maybe bad areas. Who knows
All stores are now closing .. think it's due to cutbacks
I work at GP 15 days out of the month I shop at night .
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