Which county has the highest mixed race population?

[jimrtex]

This data is available on the Census website if you're willing to look for it. lol.

And Census released the USA County database files fairly recently.  They are here.

Assuming I have the right column (RHI605210D), the county with the highest percentage of people of two or more races is Hawaii County, Hawaii, a.k.a. the Big Island, at 29.5%.  The top ten counties are dominated by counties or equivalents from Hawaii and Alaska, with one county from Oklahoma on the list:

1) Hawaii, HI 29.5%
2) Kauai, HI 24.9%
3) Maui, HI 23.6% 
4) Honolulu, HI 22.3%
5) Bristol Bay, AK 16.8%
6) Kalawao, HI 15.6%
7) Yakutat, AK 15.4%
Adair, OK 10.5%
9) Hoonah-Angoon, AK 10.2%
10) Lake and Peninsula, AK 10.1%

That's all 5 Hawaiian counties, 4 Alaskan boroughs/CDPs and a county from Oklahoma.  The only county from outside of those 3 states in the top 20 is Mahnomen, MN at number 20.

Yellowstone National Park, MT, Clifton Forge, VA and South Boston, VA have no persons of two or more races.  In fact, it looks like they have no people at all.  Of those counties with residents, Billings, ND and Hayes, NE are last with 0.1% of the population of two or more races.

Hawaiian Islander and Alaskan Native might be checked by some people from Hawaii or Alaska, just like many District of Columbia residents believe they were born in Washington.