Arapahoe County, CO population by gender
The table below shows Arapahoe County's population by gender
Gender | Population | % of Total Population |
---|---|---|
Female | 326,671 | 50.13% |
Male | 324,950 | 49.87% |
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Arapahoe County, CO population by gender, in percentage
The female percentage in the USA is 50.50% while the male percentage is 49.50%, compared to 50.13% females and 49.87% males in Arapahoe County, CO.
The above comparison shows there are more females than males in the Arapahoe County county as compared to the nation.

Arapahoe County, CO gender ratio
Sources: U.S. Census Bureau, American Community Survey (ACS) 2021
In Arapahoe County, CO, there are less men than women. The Arapahoe County, CO gender ratio is 99.5:100 i.e. 99.5 men to 100 women (0.995).
This ratio is higher than the national average of 98:100 i.e 98 men to 100 women (0.980).
Arapahoe County, CO gender ratio by age
In Arapahoe County, CO, the sex ratio for children under 18 years is 105.4 boys per 100 girls (105.4:100).Having said that, for seniors aged 80 and older, there are 65.6 males per 100 females (65.6:100).
On the national level, the sex ratio (male per 100 females) for under 18 age group is 104.8:100, and 64.5:100 for the senior population 80 years and older.
The table below lists the male and female population in each age group along with the gender ratio for Arapahoe County, CO.
Age Group | Population (Male) | Population (Female) | Gender Ratio |
---|---|---|---|
Under 5 years | 19,814 | 19,124 | 1.04 |
5 to 9 years | 21,014 | 20,921 | 1.00 |
10 to 14 years | 23,740 | 21,217 | 1.12 |
15 to 19 years | 21,263 | 19,766 | 1.08 |
20 to 24 years | 19,541 | 18,901 | 1.03 |
25 to 29 years | 25,585 | 24,359 | 1.05 |
30 to 34 years | 26,377 | 25,119 | 1.05 |
35 to 39 years | 24,875 | 23,426 | 1.06 |
40 to 44 years | 23,627 | 23,495 | 1.01 |
45 to 49 years | 22,056 | 21,805 | 1.01 |
50 to 54 years | 20,220 | 20,256 | 1.00 |
55 to 59 years | 19,406 | 20,497 | 0.95 |
60 to 64 years | 18,984 | 20,070 | 0.95 |
65 to 69 years | 14,751 | 16,123 | 0.91 |
70 to 74 years | 10,826 | 13,235 | 0.82 |
75 to 79 years | 5,608 | 7,290 | 0.77 |
80 to 84 years | 3,616 | 4,859 | 0.74 |
85 years and over | 3,647 | 6,208 | 0.59 |
Interesting observation from the above table:
- The sex ratio at birth is 1.036 i.e. 103.6 boys per 100 girls.
- For the 60-64 years, the sex ratio is 0.946 i.e. 5.4 less men per 100 women.
- While for senior most population of 85+ age group, the sex ratio is 0.587 i.e. 58.7 senior men per 100 senior women.
Arapahoe County, CO population by gender & age
For male population, the largest age group is 30-34 years with a population of 26,377. Whereas, for the female population, the largest age group is 30-34 years with a population of 25,119.
As you can note from the above numbers, the largest age group for men and women are same. The above comparison also shows that there are 1,258 less females than males, in the age group 30-34 years (The largest age group for both of the genders).

Under the age of 5, there are 19,814 boys and 19,124 girls in Arapahoe County, CO. Thus there are 690 more boys than girls under the age of 5.
Between the age group of 60-64 years, there are 18,984 males and 20,070 females in Arapahoe County, CO. Thus there are 1,086 less males than females between the age of 60 and 64 years.
For the senior most age group of 85+ years, there are 3,647 males and 6,208 females.
Things to know
What percent of Arapahoe County, CO is female?
According to the ACS survey, of the total Arapahoe County, CO population of 651,621, 50.13% percent are females.
What percentage of Arapahoe County, CO is male?
According to the ACS survey, of the total Arapahoe County, CO population of 651,621, 49.87% percent are males.
What is the male to female ratio in Arapahoe County, CO?
In Arapahoe County, CO, the male to female ratio is 99.5:100 i.e. 99.5 men to 100 women (0.995).
References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates