The difference between Local and Nationwide

When used as adjectives, local means from or in a nearby location, whereas nationwide means extending throughout an entire nation.

Local is also noun with the meaning: a person who lives near a given place.

Nationwide is also adverb with the meaning: throughout a nation.

check bellow for the other definitions of Local and Nationwide

Local as an adjective:

From or in a nearby location.

Examples:

"We prefer local produce."
Local as an adjective (computing, of a [[variable]] or [[identifier]]):

Having limited scope (either lexical or dynamic); only being accessible within a certain portion of a program.
Local as an adjective (mathematics, not comparable, of a condition or state):

Applying to each point in a space rather than the space as a whole.
Local as an adjective (medicine):

Of or pertaining to a restricted part of an organism.

Examples:

"The patient didn't want to be sedated, so we applied only local anesthesia."
Local as an adjective:

Descended from an indigenous population.

Examples:

"Hawaiian Pidgin is spoken by the local population."

Local as a noun:

A person who lives near a given place.

Examples:

"It's easy to tell the locals from the tourists."
Local as a noun:

A branch of a nationwide organization such as a trade union.

Examples:

"I'm in the TWU, too. Local 6."
Local as a noun (rail transport):

A train that stops at all, or almost all, stations between its origin and destination, including very small ones.

Examples:

"The expresses skipped my station, so I had to take a local."
Local as a noun (British):

One's nearest or regularly frequented public house or bar.

Examples:

"I got barred from my local, so I've started going all the way into town for a drink."
Local as a noun (programming):

A locally scoped identifier.

Examples:

"Functional programming languages usually don't allow changing the immediate value of locals once they've been initialized, unless they're explicitly marked as being mutable."
Local as a noun (US, slang, journalism):

An item of news relating to the place where the newspaper is published.
Local as a noun (colloquial, medicine):

Examples:

"'1989, ''Road House'', 39:59:"

"Well, Mr. Dalton, you may add nine staples to your dossier of thirty‐one broken bones, two bullet wounds, nine puncture wounds and four steel screws. That’s an estimate, of course. I’ll give you a local."

Nationwide as an adjective:

Extending throughout an entire nation.

Examples:

"There was a nationwide search on for the bankrobbers."