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Boulder County Historical First Ancestry Data

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ACS 2010-2014 data

269,846 (88.43%) out of the total population of 305,166 reported first ancestry.

	Boulder County	% of the Total Population	Colorado	U.S.
Arab	1,095	0.36%, see rank	0.39%	0.56%
Czech	3,171	1.04%, see rank	0.70%	0.47%
Danish	2,792	0.91%, see rank	0.82%	0.42%
Dutch	6,346	2.08%, see rank	1.81%	1.40%
English	40,197	13.17%, see rank	10.49%	8.02%
French	13,076	4.28%, see rank	3.48%	3.34%
German	67,399	22.09%, see rank	20.88%	15.03%
Greek	1,844	0.60%, see rank	0.38%	0.41%
Hungarian	1,954	0.64%, see rank	0.39%	0.46%
Irish	41,331	13.54%, see rank	12.04%	10.80%
Italian	18,095	5.93%, see rank	5.10%	5.52%
Norwegian	7,823	2.56%, see rank	2.18%	1.42%
Polish	11,300	3.70%, see rank	2.51%	3.01%
Portuguese	601	0.20%, see rank	0.21%	0.44%
Russian	5,841	1.91%, see rank	1.09%	0.92%
Scotch-Irish	4,712	1.54%, see rank	1.27%	0.99%
Scottish	11,249	3.69%, see rank	2.56%	1.72%
Subsaharan African	1,074	0.35%, see rank	0.73%	0.95%
Swedish	8,978	2.94%, see rank	2.43%	1.27%
Swiss	2,075	0.68%, see rank	0.46%	0.30%
Ukrainian	1,102	0.36%, see rank	0.25%	0.31%
American	15,032	4.93%, see rank	5.18%	7.12%
Welsh	3,660	1.20%, see rank	0.92%	0.57%

ACS 2008-2012 data

270,889 (91.14%) out of the total population of 297,218 reported first ancestry.

	Boulder County	% of the Total Population	Colorado	U.S.
Arab	1,098	0.37%, see rank	0.36%	0.53%
Czech	3,268	1.10%, see rank	0.73%	0.50%
Danish	3,279	1.10%, see rank	0.90%	0.45%
Dutch	6,960	2.34%, see rank	1.91%	1.51%
English	40,911	13.76%, see rank	11.19%	8.53%
French	13,907	4.68%, see rank	3.75%	3.54%
German	68,208	22.95%, see rank	22.06%	15.79%
Greek	1,715	0.58%, see rank	0.40%	0.42%
Hungarian	2,119	0.71%, see rank	0.42%	0.48%
Irish	41,542	13.98%, see rank	12.52%	11.36%
Italian	17,793	5.99%, see rank	5.22%	5.66%
Norwegian	8,167	2.75%, see rank	2.26%	1.46%
Polish	11,680	3.93%, see rank	2.55%	3.13%
Portuguese	687	0.23%, see rank	0.20%	0.46%
Russian	6,102	2.05%, see rank	1.15%	0.97%
Scotch-Irish	4,789	1.61%, see rank	1.37%	1.07%
Scottish	11,251	3.79%, see rank	2.69%	1.81%
Subsaharan African	810	0.27%, see rank	0.64%	0.93%
Swedish	9,318	3.14%, see rank	2.64%	1.34%
Swiss	1,943	0.65%, see rank	0.48%	0.31%
Ukrainian	1,060	0.36%, see rank	0.25%	0.31%
American	12,628	4.25%, see rank	4.88%	6.72%
Welsh	3,324	1.12%, see rank	0.93%	0.60%

ACS 2006-2010 data

267,126 (92.06%) out of the total population of 290,177 reported first ancestry.

	Boulder County	% of the Total Population	Colorado	U.S.
Arab	1,296	0.45%, see rank	0.33%	0.50%
Czech	3,142	1.08%, see rank	0.78%	0.53%
Danish	3,297	1.14%, see rank	0.95%	0.48%
Dutch	7,077	2.44%, see rank	1.98%	1.63%
English	42,781	14.74%, see rank	11.90%	9.02%
French	13,566	4.68%, see rank	3.96%	3.77%
German	69,999	24.12%, see rank	22.99%	16.51%
Greek	1,930	0.67%, see rank	0.40%	0.44%
Hungarian	2,005	0.69%, see rank	0.43%	0.51%
Irish	40,812	14.06%, see rank	12.87%	11.76%
Italian	17,713	6.10%, see rank	5.18%	5.78%
Norwegian	8,374	2.89%, see rank	2.34%	1.51%
Polish	11,175	3.85%, see rank	2.54%	3.24%
Portuguese	735	0.25%, see rank	0.22%	0.47%
Russian	6,812	2.35%, see rank	1.23%	1.01%
Scotch-Irish	7,774	2.68%, see rank	2.21%	1.72%
Scottish	12,390	4.27%, see rank	2.86%	1.92%
Subsaharan African	659	0.23%, see rank	0.55%	0.91%
Swedish	10,241	3.53%, see rank	2.81%	1.41%
Swiss	1,893	0.65%, see rank	0.52%	0.33%
Ukrainian	1,067	0.37%, see rank	0.27%	0.31%
American	9,185	3.17%, see rank	4.46%	6.28%
Welsh	3,260	1.12%, see rank	0.96%	0.63%

ACS 2005-2009 data

273,071 (92.40%) out of the total population of 295,524 reported first ancestry.

	Boulder County	% of the Total Population	Colorado	U.S.
Arab	1,327	0.45%, see rank	0.33%	0.50%
Czech	3,200	1.08%, see rank	0.80%	0.54%
Danish	3,419	1.16%, see rank	0.99%	0.49%
Dutch	7,653	2.59%, see rank	2.06%	1.68%
English	44,244	14.97%, see rank	12.26%	9.29%
French	13,728	4.65%, see rank	4.07%	3.90%
German	73,333	24.81%, see rank	23.49%	16.89%
Greek	2,255	0.76%, see rank	0.42%	0.45%
Hungarian	2,006	0.68%, see rank	0.45%	0.52%
Irish	41,518	14.05%, see rank	13.00%	12.01%
Italian	17,430	5.90%, see rank	5.20%	5.91%
Norwegian	8,959	3.03%, see rank	2.40%	1.55%
Polish	11,476	3.88%, see rank	2.56%	3.32%
Portuguese	664	0.22%, see rank	0.22%	0.48%
Russian	6,944	2.35%, see rank	1.28%	1.04%
Scotch-Irish	8,408	2.85%, see rank	2.31%	1.77%
Scottish	12,173	4.12%, see rank	2.90%	1.97%
Subsaharan African	672	0.23%, see rank	0.55%	0.88%
Swedish	10,217	3.46%, see rank	2.84%	1.45%
Swiss	2,070	0.70%, see rank	0.50%	0.34%
Ukrainian	1,038	0.35%, see rank	0.27%	0.32%
American	9,594	3.25%, see rank	4.64%	6.43%
Welsh	3,586	1.21%, see rank	0.99%	0.65%

US Census 2000 data

244,389 (83.90%) out of the total population of 291,288 reported first ancestry.

	Boulder County	% of the Total Population	Colorado	U.S.
Arab	925	0.32%, see rank	0.24%	0.36%
Czech	1,105	0.38%, see rank	0.37%	0.27%
Danish	2,451	0.84%, see rank	0.61%	0.30%
Dutch	3,299	1.13%, see rank	1.12%	0.91%
English	26,986	9.26%, see rank	7.68%	5.91%
French	7,027	2.41%, see rank	2.24%	2.39%
German	48,298	16.58%, see rank	15.70%	10.81%
Greek	751	0.26%, see rank	0.28%	0.34%
Hungarian	1,094	0.38%, see rank	0.27%	0.32%
Irish	24,655	8.46%, see rank	7.36%	6.85%
Italian	11,964	4.11%, see rank	3.69%	4.59%
Norwegian	6,375	2.19%, see rank	1.83%	1.15%
Polish	6,245	2.14%, see rank	1.56%	2.24%
Portuguese	409	0.14%, see rank	0.11%	0.33%
Russian	3,836	1.32%, see rank	0.69%	0.68%
Scotch-Irish	5,443	1.87%, see rank	1.52%	1.17%
Scottish	7,262	2.49%, see rank	1.70%	1.12%
Subsaharan African	621	0.21%, see rank	0.38%	0.61%
Swedish	5,926	2.03%, see rank	1.72%	0.87%
Swiss	1,265	0.43%, see rank	0.28%	0.19%
Ukrainian	875	0.30%, see rank	0.19%	0.24%
American	11,671	4.01%, see rank	5.15%	7.33%
Welsh	2,036	0.70%, 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.