"McDonald's" in plural

[Rachel Adams]

Hello.
Can I use McDonald's in plural?
"In the big cities of Georgia we have many McDonald's. " "The" can be omitted, if I am not wrong.

[GoesStation]

Can I use McDonald's in plural?
"In the big cities of Georgia we have many McDonald's. " "The" can be omitted, if I am not wrong.

You've used the plural correctly. You need the article.

[Rachel Adams]

You've used the plural correctly. You need the article.

I am talking about the cities generally. I thought I could omit "the."
If I use "In the big city of Tbilisi" the article should also be used. Right?

[GoesStation]

If I use "In the big city of Tbilisi" the article should also be used. Right?

Yes.

[Charlie Bernstein]

I am talking about the cities generally. I thought I could omit "the."
If I use "In the big city of Tbilisi" the article should also be used. Right?

These are natural:

- In the big cities of Georgia . . . .

- In big cities in Georgia . . . .

- In Georgia's big cities . . . .

You can also use bigger in all of those.

[Rachel Adams]

Yes.

I understand that the article should be used in "in the big cities of Georgia" but I can't explain why.

[GoesStation]

I understand that the article should be used in "in the big cities of Georgia" but I can't explain why.

There are many big cities. We're talking about a specific set of them: Georgia's big cities; the big cities of Georgia.

[Yankee]

These are natural:

- In the big cities of Georgia . . . .

- In big cities in Georgia . . . .

- In Georgia's big cities . . . .

You can also use bigger in all of those.

In your second example as stated I would prefer to use "of Georgia".

[Rachel Adams]

There are many big cities. We're talking about a specific set of them: Georgia's big cities; the big cities of Georgia.

So it has nothing to do with "of" being used in that sentence? I thought perhaps with "of" I should use "the". "In big cities in Georgia" there is no "of" but am I not speaking about the same specific cities?
"In big cities in Georgia" is correct while "In big cities of Georgia" isn't.

[Charlie Bernstein]

In your second example as stated I would prefer to use "of Georgia".

I wouldn't, but you can go right ahead! (It's fine.)