| ilan5-ga,
Depends, of course, what you mean by "ethnic" group.
A great place to explore population figures for any city, county or
state in the US is the American FactFinder site of the US Census
Bureau:
http://factfinder.census.gov
Where it says "Get a Fact Sheet for your community" simply enter Los
Angeles County and select California as your state, and you'll
instantly get a host of summary statistics for the county.
By clicking on some of the "show more" links, you'll get further
breakdowns of the population, that eventually lead to the following
stats:
Total population
9,758,886
 
White
 4,968,846
 
Hispanic or Latino (of any race)
 4,613,450
 
Asian
 1,273,995
Black or African American
 868,199
Two or more races
 256,099
 
American Indian and Alaska Native
 48,544
Native Hawaiian and Other Pacific Islander
 29,841
Several of the above groups can be further sub-divided, and the major
ethnic groups are:
Mexican
 3,571,258
Other Hispanic or Latino
 960,215
Chinese
 351,148
 
Filipino
 297,345
Korean
 203,412
 
Japanese
 122,016
Vietnamese
 103,332
Asian Indian
 81,148
 
Native Hawaiian and Other Pacific Islander
 29,841
I trust this information fully answers your question.  
However, please don't rate this answer until you have everything you
need.  If you would like any additional information, just post a
Request for Clarification to let me know how I can assist you further,
and I'm at your service.
pafalafa-ga
search strategy -- Used bookmarked site for Census Bureau | 
| Request for Answer Clarification by
ilan5-ga
on
28 Oct 2006 12:44 PDT
 I dont see where are the armenians, persian, Jewish, Russians
 | 
 | Clarification of Answer by
pafalafa-ga
on
28 Oct 2006 12:53 PDT
 ilan5-ga,
Do you have reason to suppose the groups you listed would appear in the Top Ten?
"Ethnicity" is a slippery concept.  For instance, "Jewish" is a
religion, while "Russia" is a place, and there are many Russian Jews,
as well as Russian non-Jews.  It's hard to know which to call an
"ethnic" group.
If there are particular groups you want more information about,
perhaps it would make sense to post a new question asking for specific
information about those groups.
But as for your current question, if there's more I can for you here,
please let me know what it is you need, and I'll certainly do my best.
 If the information provided doesn't meet your needs, let me know that
as well, and please explain how I might better address your question.
Thanks,
pafalafa-ga
 | 
 | Request for Answer Clarification by
ilan5-ga
on
29 Oct 2006 09:20 PST
 I have the numbers for Hispanic, Chinese, Filipino, Japanese, Vietnamese, and
Korean.
do you have the numbers for 
armenians, 
persian, 
Jewish, 
Russians (includind jewish russian)
Thanks,
 | 
 | Clarification of Answer by
pafalafa-ga
on
29 Oct 2006 09:36 PST
 ilan5-ga,
I haven't found data for all the groups you mentioned in your
clarification, but perhaps in terms of your original question, I can
perhaps do even better.
The American Fact Finder site has another section that shows Ancestry
data for Los Angeles County, where you'll find more than 25 categories
of ethnic background, in addition to the ones already provided:
ANCESTRY
 
Total population
 9,758,886
 
American
 306,920
 
Arab
 73,395
 
 
Czech
 19,707
 
 
Danish
 27,452
 
 
Dutch
 60,360
 
 
English
 414,975
 
 
French (except Basque)
 138,097
 
 
French Canadian
 23,535
 
 
German
 539,852
 
 
Greek
 25,034
 
 
Hungarian
 41,702
 
 
Irish
 417,845
 
 
Italian
 270,862
 
 
Lithuanian
 12,261
 
 
Norwegian
 60,216
 
 
Polish
 132,404
 
 
Portuguese
 20,439
 
 
Russian
 151,547
 
 
Scotch-Irish
 67,146
 
 
Scottish
 92,418
 
 
Slovak
 5,593
 
 
Subsaharan African
 55,282
 
 
Swedish
 68,819
 
 
Swiss
 16,381
 
 
Ukrainian
 22,235
 
 
Welsh
 28,745
 
 
West Indian (excluding Hispanic origin groups)
 33,501
Hope that does the trick.
paf
 | 
 | Request for Answer Clarification by
ilan5-ga
on
29 Oct 2006 10:59 PST
 Can you find a data for these three
armenians, 
persian, 
Jewish,
 | 
 | Clarification of Answer by
pafalafa-ga
on
29 Oct 2006 12:06 PST
 It seems very unlikely that Armenians, Persians, or Jews would be
among the Top Ten population subgroups, as your original question
asked for.
I have not found any data on these particular groups, despite putting
in a good deal of looking.
Perhaps if you post this request as a new question at Google Answers,
a researcher will be able to uncover additional data.
Cheers,
paf
 |