where do you come from?

Where are you from?

I'm from ***, yyy.

?

In a letter I want to write it in this way,

My name is blinkin' from/of THISCITY, COUNTY, USA.

is this ok?

Counties are not commonly used in many places. It's very common to just say "I'm Barb, from Brunswick, Maine."

It's not so common to say "I'm Barb, from Brunswick, Cumberland County, Maine."

If you do, you might want to "spell it out a little," by saying something like "My name is Barb, from the town of Brunsick, in Cumberland County, Maine."

so, when stating where I come from, is it city, county, etc. or county then city?

Usually, it's city and then state. When including county, there is no set pattern, but something like this sounds natural:

I was born in Contra Costa County, California, in the city of Concord. Or I was born in the city of Concord in Contra Costa County, California.

It's less common to say I was born in Concord, Contra Costa County, California.

so, can I say: I'm from the city of Long Beach in LA County.

and how about if you say what organization you're from?

I'm from the Presbyterian denomination of Christianity?
or I'm of the Baptist denomination of Christianity?

If you are JUST saying city and county (not state - because everyone already knows it's California), then I'm from Long Beach in LA County is fine. But I wouldn't say "I'm from Concord in Contra Costa County" because no one outside of California knows where Concord Contra Costa is.

In the case of the church, you'd just say "I'm a Presybterian" or "I'm a Baptist." You're not FROM there, un

I see,

so if I'm a member of some thing, I'd say:

I'm blinkin' of the humane society.

but, if I used to be a part of something, and then left. can I say:
formerly of the humane society, or formerly from?

for example, if I'm going to narrate a brief story from my life to a club I've just joined and want to introduce a bit of info about myself. can I say like

Hi,

That all sounds more or less acceptable.

As pointed out earlier, in N. America we don't usually speak of our 'county', just of our town or state/province.

Best wishes, Clive

Since it's more or less acceptable, is there a standard way to say you are of/from somewhere or something?

I was a worker of best buy. I was a worker from best buy.