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Castle Rock, CO Historical First Ancestry Data
ACS 2010-2014 data
46,130 (89.05%) out of the total population of 51,802 reported first ancestry.
| Castle Rock, CO | % of the Total Population | Colorado | U.S. | |
| Arab | 351 | 0.68%, see rank | 0.39% | 0.56% |
| Czech | 412 | 0.80%, see rank | 0.70% | 0.47% |
| Danish | 476 | 0.92%, see rank | 0.82% | 0.42% |
| Dutch | 1,450 | 2.80%, see rank | 1.81% | 1.40% |
| English | 6,712 | 12.96%, see rank | 10.49% | 8.02% |
| French | 2,459 | 4.75%, see rank | 3.48% | 3.34% |
| German | 13,496 | 26.05%, see rank | 20.88% | 15.03% |
| Greek | 296 | 0.57%, see rank | 0.38% | 0.41% |
| Hungarian | 505 | 0.97%, see rank | 0.39% | 0.46% |
| Irish | 8,357 | 16.13%, see rank | 12.04% | 10.80% |
| Italian | 3,530 | 6.81%, see rank | 5.10% | 5.52% |
| Norwegian | 1,688 | 3.26%, see rank | 2.18% | 1.42% |
| Polish | 2,155 | 4.16%, see rank | 2.51% | 3.01% |
| Portuguese | 110 | 0.21%, see rank | 0.21% | 0.44% |
| Russian | 565 | 1.09%, see rank | 1.09% | 0.92% |
| Scotch-Irish | 964 | 1.86%, see rank | 1.27% | 0.99% |
| Scottish | 1,496 | 2.89%, see rank | 2.56% | 1.72% |
| Subsaharan African | 114 | 0.22%, see rank | 0.73% | 0.95% |
| Swedish | 1,468 | 2.83%, see rank | 2.43% | 1.27% |
| Swiss | 200 | 0.39%, see rank | 0.46% | 0.30% |
| Ukrainian | 173 | 0.33%, see rank | 0.25% | 0.31% |
| American | 2,613 | 5.04%, see rank | 5.18% | 7.12% |
| Welsh | 476 | 0.92%, see rank | 0.92% | 0.57% |
ACS 2008-2012 data
44,012 (91.08%) out of the total population of 48,321 reported first ancestry.
| Castle Rock, CO | % of the Total Population | Colorado | U.S. | |
| Arab | 354 | 0.73%, see rank | 0.36% | 0.53% |
| Czech | 581 | 1.20%, see rank | 0.73% | 0.50% |
| Danish | 397 | 0.82%, see rank | 0.90% | 0.45% |
| Dutch | 1,378 | 2.85%, see rank | 1.91% | 1.51% |
| English | 6,378 | 13.20%, see rank | 11.19% | 8.53% |
| French | 2,356 | 4.88%, see rank | 3.75% | 3.54% |
| German | 13,221 | 27.36%, see rank | 22.06% | 15.79% |
| Greek | 389 | 0.81%, see rank | 0.40% | 0.42% |
| Hungarian | 302 | 0.62%, see rank | 0.42% | 0.48% |
| Irish | 8,334 | 17.25%, see rank | 12.52% | 11.36% |
| Italian | 3,512 | 7.27%, see rank | 5.22% | 5.66% |
| Norwegian | 1,327 | 2.75%, see rank | 2.26% | 1.46% |
| Polish | 2,288 | 4.74%, see rank | 2.55% | 3.13% |
| Portuguese | 46 | 0.10%, see rank | 0.20% | 0.46% |
| Russian | 659 | 1.36%, see rank | 1.15% | 0.97% |
| Scotch-Irish | 1,047 | 2.17%, see rank | 1.37% | 1.07% |
| Scottish | 1,572 | 3.25%, see rank | 2.69% | 1.81% |
| Subsaharan African | 64 | 0.13%, see rank | 0.64% | 0.93% |
| Swedish | 1,589 | 3.29%, see rank | 2.64% | 1.34% |
| Swiss | 181 | 0.37%, see rank | 0.48% | 0.31% |
| Ukrainian | 80 | 0.17%, see rank | 0.25% | 0.31% |
| American | 2,572 | 5.32%, see rank | 4.88% | 6.72% |
| Welsh | 721 | 1.49%, see rank | 0.93% | 0.60% |
ACS 2006-2010 data
40,852 (92.00%) out of the total population of 44,402 reported first ancestry.
| Castle Rock, CO | % of the Total Population | Colorado | U.S. | |
| Arab | 100 | 0.23%, see rank | 0.33% | 0.50% |
| Czech | 579 | 1.30%, see rank | 0.78% | 0.53% |
| Danish | 504 | 1.14%, see rank | 0.95% | 0.48% |
| Dutch | 1,485 | 3.34%, see rank | 1.98% | 1.63% |
| English | 6,090 | 13.72%, see rank | 11.90% | 9.02% |
| French | 2,353 | 5.30%, see rank | 3.96% | 3.77% |
| German | 12,034 | 27.10%, see rank | 22.99% | 16.51% |
| Greek | 281 | 0.63%, see rank | 0.40% | 0.44% |
| Hungarian | 260 | 0.59%, see rank | 0.43% | 0.51% |
| Irish | 8,091 | 18.22%, see rank | 12.87% | 11.76% |
| Italian | 3,561 | 8.02%, see rank | 5.18% | 5.78% |
| Norwegian | 1,287 | 2.90%, see rank | 2.34% | 1.51% |
| Polish | 2,067 | 4.66%, see rank | 2.54% | 3.24% |
| Portuguese | 40 | 0.09%, see rank | 0.22% | 0.47% |
| Russian | 916 | 2.06%, see rank | 1.23% | 1.01% |
| Scotch-Irish | 1,415 | 3.19%, see rank | 2.21% | 1.72% |
| Scottish | 1,406 | 3.17%, see rank | 2.86% | 1.92% |
| Subsaharan African | 111 | 0.25%, see rank | 0.55% | 0.91% |
| Swedish | 1,718 | 3.87%, see rank | 2.81% | 1.41% |
| Swiss | 220 | 0.50%, see rank | 0.52% | 0.33% |
| Ukrainian | 60 | 0.14%, see rank | 0.27% | 0.31% |
| American | 2,141 | 4.82%, see rank | 4.46% | 6.28% |
| Welsh | 714 | 1.61%, see rank | 0.96% | 0.63% |
ACS 2005-2009 data
38,170 (92.38%) out of the total population of 41,320 reported first ancestry.
| Castle Rock, CO | % of the Total Population | Colorado | U.S. | |
| Arab | 118 | 0.29%, see rank | 0.33% | 0.50% |
| Czech | 674 | 1.63%, see rank | 0.80% | 0.54% |
| Danish | 535 | 1.29%, see rank | 0.99% | 0.49% |
| Dutch | 1,150 | 2.78%, see rank | 2.06% | 1.68% |
| English | 5,648 | 13.67%, see rank | 12.26% | 9.29% |
| French | 2,054 | 4.97%, see rank | 4.07% | 3.90% |
| German | 11,497 | 27.82%, see rank | 23.49% | 16.89% |
| Greek | 171 | 0.41%, see rank | 0.42% | 0.45% |
| Hungarian | 151 | 0.37%, see rank | 0.45% | 0.52% |
| Irish | 7,808 | 18.90%, see rank | 13.00% | 12.01% |
| Italian | 3,118 | 7.55%, see rank | 5.20% | 5.91% |
| Norwegian | 1,306 | 3.16%, see rank | 2.40% | 1.55% |
| Polish | 1,790 | 4.33%, see rank | 2.56% | 3.32% |
| Portuguese | 54 | 0.13%, see rank | 0.22% | 0.48% |
| Russian | 870 | 2.11%, see rank | 1.28% | 1.04% |
| Scotch-Irish | 1,258 | 3.04%, see rank | 2.31% | 1.77% |
| Scottish | 1,165 | 2.82%, see rank | 2.90% | 1.97% |
| Subsaharan African | 116 | 0.28%, see rank | 0.55% | 0.88% |
| Swedish | 1,666 | 4.03%, see rank | 2.84% | 1.45% |
| Swiss | 205 | 0.50%, see rank | 0.50% | 0.34% |
| Ukrainian | 41 | 0.10%, see rank | 0.27% | 0.32% |
| American | 1,989 | 4.81%, see rank | 4.64% | 6.43% |
| Welsh | 774 | 1.87%, see rank | 0.99% | 0.65% |
US Census 2000 data
16,546 (81.81%) out of the total population of 20,224 reported first ancestry.
| Castle Rock, CO | % of the Total Population | Colorado | U.S. | |
| Arab | 9 | 0.04%, see rank | 0.24% | 0.36% |
| Czech | 93 | 0.46%, see rank | 0.37% | 0.27% |
| Danish | 101 | 0.50%, see rank | 0.61% | 0.30% |
| Dutch | 255 | 1.26%, see rank | 1.12% | 0.91% |
| English | 1,737 | 8.59%, see rank | 7.68% | 5.91% |
| French | 653 | 3.23%, see rank | 2.24% | 2.39% |
| German | 4,375 | 21.63%, see rank | 15.70% | 10.81% |
| Greek | 114 | 0.56%, see rank | 0.28% | 0.34% |
| Hungarian | 37 | 0.18%, see rank | 0.27% | 0.32% |
| Irish | 1,615 | 7.99%, see rank | 7.36% | 6.85% |
| Italian | 984 | 4.87%, see rank | 3.69% | 4.59% |
| Norwegian | 492 | 2.43%, see rank | 1.83% | 1.15% |
| Polish | 540 | 2.67%, see rank | 1.56% | 2.24% |
| Portuguese | 33 | 0.16%, see rank | 0.11% | 0.33% |
| Russian | 99 | 0.49%, see rank | 0.69% | 0.68% |
| Scotch-Irish | 280 | 1.38%, see rank | 1.52% | 1.17% |
| Scottish | 430 | 2.13%, see rank | 1.70% | 1.12% |
| Subsaharan African | 0 | 0.00%, see rank | 0.38% | 0.61% |
| Swedish | 505 | 2.50%, see rank | 1.72% | 0.87% |
| Swiss | 63 | 0.31%, see rank | 0.28% | 0.19% |
| Ukrainian | 27 | 0.13%, see rank | 0.19% | 0.24% |
| American | 959 | 4.74%, see rank | 5.15% | 7.33% |
| Welsh | 63 | 0.31%, see rank | 0.49% | 0.31% |
* ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.