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Jefferson County Historical Age Data

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ACS 2010-2014 data

Total population: 546,162

Median Age (see rank)

Jefferson County	40.40 years old
Colorado	36.20 years old
U.S.	37.40 years old

Median Age, Male (see rank)

Jefferson County	38.90 years old
Colorado	35.30 years old
U.S.	36.10 years old

Median Age, Female (see rank)

Jefferson County	41.80 years old
Colorado	37.30 years old
U.S.	38.80 years old

	Jefferson County	% of the Total Population	Colorado	U.S.
Under 5 years	29,689	5.44%, see rank	6.49%	6.36%
5 to 9 years	33,198	6.08%, see rank	6.79%	6.51%
10 to 14 years	33,457	6.13%, see rank	6.63%	6.59%
15 to 19 years	34,434	6.30%, see rank	6.57%	6.85%
20 to 24 years	33,312	6.10%, see rank	7.07%	7.13%
25 to 34 years	70,994	13.00%, see rank	14.71%	13.47%
35 to 44 years	71,341	13.06%, see rank	13.67%	12.96%
45 to 54 years	86,596	15.86%, see rank	13.93%	14.09%
55 to 64 years	78,670	14.40%, see rank	12.31%	12.29%
65 to 74 years	42,890	7.85%, see rank	6.91%	7.64%
75 to 84	22,081	4.04%, see rank	3.46%	4.25%
85 years and over	9,500	1.74%, see rank	1.45%	1.85%

US Census 2010 data

Total population: 534,543

Median Age (see rank)

Jefferson County	40.40 years old
Colorado	36.10 years old
U.S.	37.20 years old

Median Age, Male (see rank)

Jefferson County	39.00 years old
Colorado	35.10 years old
U.S.	35.80 years old

Median Age, Female (see rank)

Jefferson County	41.80 years old
Colorado	37.10 years old
U.S.	38.50 years old

	Jefferson County	% of the Total Population	Colorado	U.S.
Under 5 years	30,411	5.69%, see rank	6.84%	6.54%
5 to 9 years	32,839	6.14%, see rank	6.93%	6.59%
10 to 14 years	33,982	6.36%, see rank	6.61%	6.70%
15 to 19 years	35,312	6.61%, see rank	6.75%	7.14%
20 to 24 years	31,415	5.88%, see rank	6.93%	6.99%
25 to 34 years	65,801	12.31%, see rank	14.44%	13.30%
35 to 44 years	71,975	13.46%, see rank	13.91%	13.30%
45 to 54 years	91,184	17.06%, see rank	14.77%	14.58%
55 to 64 years	74,213	13.88%, see rank	11.88%	11.82%
65 to 74 years	37,585	7.03%, see rank	6.16%	7.03%
75 to 84	21,231	3.97%, see rank	3.38%	4.23%
85 years and over	8,595	1.61%, see rank	1.38%	1.78%

ACS 2008-2012 data

Total population: 536,095

Median Age (see rank)

Jefferson County	40.20 years old
Colorado	36.10 years old
U.S.	37.20 years old

Median Age, Male (see rank)

Jefferson County	38.80 years old
Colorado	35.10 years old
U.S.	35.80 years old

Median Age, Female (see rank)

Jefferson County	41.60 years old
Colorado	37.10 years old
U.S.	38.50 years old

	Jefferson County	% of the Total Population	Colorado	U.S.
Under 5 years	30,087	5.61%, see rank	6.76%	6.51%
5 to 9 years	31,761	5.92%, see rank	6.91%	6.57%
10 to 14 years	34,953	6.52%, see rank	6.56%	6.68%
15 to 19 years	35,007	6.53%, see rank	6.75%	7.09%
20 to 24 years	32,295	6.02%, see rank	7.00%	7.04%
25 to 34 years	66,496	12.40%, see rank	14.49%	13.32%
35 to 44 years	72,527	13.53%, see rank	13.95%	13.34%
45 to 54 years	90,285	16.84%, see rank	14.59%	14.44%
55 to 64 years	74,652	13.93%, see rank	11.90%	11.84%
65 to 74 years	38,044	7.10%, see rank	6.27%	7.12%
75 to 84	21,359	3.98%, see rank	3.39%	4.25%
85 years and over	8,629	1.61%, see rank	1.41%	1.78%

ACS 2006-2010 data

Total population: 528,614

Median Age (see rank)

Jefferson County	39.70 years old
Colorado	35.80 years old
U.S.	36.90 years old

Median Age, Male (see rank)

Jefferson County	38.30 years old
Colorado	34.90 years old
U.S.	35.60 years old

Median Age, Female (see rank)

Jefferson County	41.00 years old
Colorado	36.80 years old
U.S.	38.10 years old

	Jefferson County	% of the Total Population	Colorado	U.S.
Under 5 years	30,647	5.80%, see rank	6.96%	6.62%
5 to 9 years	31,883	6.03%, see rank	6.93%	6.62%
10 to 14 years	35,075	6.64%, see rank	6.57%	6.79%
15 to 19 years	36,609	6.93%, see rank	6.97%	7.28%
20 to 24 years	31,829	6.02%, see rank	7.06%	6.98%
25 to 34 years	64,030	12.11%, see rank	14.33%	13.22%
35 to 44 years	75,410	14.27%, see rank	14.40%	13.89%
45 to 54 years	91,418	17.29%, see rank	14.99%	14.57%
55 to 64 years	68,751	13.01%, see rank	11.25%	11.28%
65 to 74 years	34,450	6.52%, see rank	5.81%	6.74%
75 to 84	20,785	3.93%, see rank	3.40%	4.30%
85 years and over	7,727	1.46%, see rank	1.33%	1.70%

ACS 2005-2009 data

Total population: 529,025

Median Age (see rank)

Jefferson County	39.50 years old
Colorado	35.50 years old
U.S.	36.50 years old

Median Age, Male (see rank)

Jefferson County	38.30 years old
Colorado	34.60 years old
U.S.	35.20 years old

Median Age, Female (see rank)

Jefferson County	40.50 years old
Colorado	36.50 years old
U.S.	37.90 years old

	Jefferson County	% of the Total Population	Colorado	U.S.
Under 5 years	31,595	5.97%, see rank	7.27%	6.92%
5 to 9 years	30,790	5.82%, see rank	6.78%	6.59%
10 to 14 years	36,147	6.83%, see rank	6.56%	6.83%
15 to 19 years	36,757	6.95%, see rank	6.88%	7.15%
20 to 24 years	32,179	6.08%, see rank	7.34%	7.02%
25 to 34 years	64,281	12.15%, see rank	14.45%	13.42%
35 to 44 years	78,590	14.86%, see rank	14.70%	14.18%
45 to 54 years	91,885	17.37%, see rank	15.01%	14.48%
55 to 64 years	65,397	12.36%, see rank	10.72%	10.81%
65 to 74 years	33,435	6.32%, see rank	5.58%	6.50%
75 to 84	20,284	3.83%, see rank	3.39%	4.40%
85 years and over	7,685	1.45%, see rank	1.30%	1.71%

US Census 2000 data

Total population: 527,056

Median Age (see rank)

Jefferson County	36.80 years old
Colorado	34.30 years old
U.S.	35.30 years old

Median Age, Male (see rank)

Jefferson County	35.80 years old
Colorado	33.20 years old
U.S.	34.00 years old

Median Age, Female (see rank)

Jefferson County	37.60 years old
Colorado	35.40 years old
U.S.	36.50 years old

	Jefferson County	% of the Total Population	Colorado	U.S.
Under 5 years	33,280	6.31%, see rank	6.92%	6.81%
5 to 9 years	36,941	7.01%, see rank	7.17%	7.30%
10 to 14 years	39,634	7.52%, see rank	7.24%	7.29%
15 to 19 years	36,700	6.96%, see rank	7.14%	7.18%
20 to 24 years	29,534	5.60%, see rank	7.12%	6.74%
25 to 34 years	71,650	13.59%, see rank	15.44%	14.18%
35 to 44 years	97,374	18.48%, see rank	17.13%	16.04%
45 to 54 years	84,675	16.07%, see rank	14.28%	13.39%
55 to 64 years	46,442	8.81%, see rank	7.89%	8.63%
65 to 74 years	28,352	5.38%, see rank	5.26%	6.54%
75 to 84	16,857	3.20%, see rank	3.29%	4.39%
85 years and over	5,617	1.07%, see rank	1.12%	1.51%

* 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.