San Mateo Sun

Of the 762,488 people living in San Mateo County, California in 2021, 50.2% (382,862) were women and 49.8% (379,626) were men, according to U.S. Census Bureau data obtained by San Mateo Sun.

Data showed the average age for women in San Mateo County in 2021 was 41 years, higher than the national average of 40 for women.

According to census data, despite women being more prevalent in San Mateo County during 2021, men aged 18 and over outnumbered women in the same age group by 6,750. Meanwhile, in the 65 and over group, there were 54,851 men and 69,018 women.

An agency of the U.S. Federal Statistical System, the Census Bureau is responsible for compiling statistical facts about the American people, places and economy. Data for this story was compiled from the bureau's American Community Survey. Information from the survey helps to determine how federal and state funds are distributed. These funds significantly influence community services, education, and infrastructure in areas like San Mateo County.

Age Range (Years)	Sex	Population in 2021	Population in 2020	Population in 2019	Change 2020-2021	Change 2019-2020
Under 5	Female	20,237	20,684	21,353	-2.2%	-3.1%
Under 5	Male	21,474	22,404	22,587	-4.2%	-0.8%
5 to 9	Female	20,817	20,681	21,255	0.7%	-2.7%
5 to 9	Male	22,568	22,885	23,697	-1.4%	-3.4%
10 to 14	Female	21,737	22,123	22,456	-1.7%	-1.5%
10 to 14	Male	22,218	21,803	21,847	1.9%	-0.2%
15 to 17	Female	13,011	12,674	12,648	2.7%	0.2%
15 to 17	Male	13,723	13,515	13,661	1.5%	-1.1%
18 and 19	Female	6,912	6,785	6,904	1.9%	-1.7%
18 and 19	Male	7,664	7,585	7,597	1%	-0.2%
20	Female	3,314	2,964	3,143	11.8%	-5.7%
20	Male	4,218	4,341	4,185	-2.8%	3.7%
21	Female	2,559	2,690	3,063	-4.9%	-12.2%
21	Male	3,734	3,756	3,720	-0.6%	1%
22 to 24	Female	13,697	14,518	14,368	-5.7%	1%
22 to 24	Male	12,898	13,363	13,649	-3.5%	-2.1%
25 to 29	Female	25,299	26,038	25,769	-2.8%	1%
25 to 29	Male	27,726	28,997	28,906	-4.4%	0.3%
30 to 34	Female	28,375	28,550	28,518	-0.6%	0.1%
30 to 34	Male	30,710	30,743	30,212	-0.1%	1.8%
35 to 39	Female	28,655	28,630	28,178	< 0.1%	1.6%
35 to 39	Male	30,266	29,883	29,136	1.3%	2.6%
40 to 44	Female	25,970	25,950	26,617	< 0.1%	-2.5%
40 to 44	Male	25,798	25,331	26,219	1.8%	-3.4%
45 to 49	Female	26,440	26,848	27,272	-1.5%	-1.6%
45 to 49	Male	26,706	26,707	27,075	> -0.1%	-1.4%
50 to 54	Female	25,983	26,533	27,181	-2.1%	-2.4%
50 to 54	Male	26,044	25,644	25,939	1.6%	-1.1%
55 to 59	Female	27,003	26,843	26,831	0.6%	< 0.1%
55 to 59	Male	25,623	25,239	25,252	1.5%	> -0.1%
60 and 61	Female	9,549	9,479	10,052	0.7%	-5.7%
60 and 61	Male	9,958	9,918	9,892	0.4%	0.3%
62 to 64	Female	14,286	14,741	14,359	-3.1%	2.7%
62 to 64	Male	13,447	12,961	13,005	3.7%	-0.3%
65 and 66	Female	7,767	8,053	8,476	-3.6%	-5%
65 and 66	Male	8,319	7,952	7,839	4.6%	1.4%
67 to 69	Female	12,850	12,780	12,138	0.5%	5.3%
67 to 69	Male	11,548	11,316	10,646	2.1%	6.3%
70 to 74	Female	17,311	16,635	16,018	4.1%	3.9%
70 to 74	Male	13,317	12,806	12,741	4%	0.5%
75 to 79	Female	11,696	11,770	11,563	-0.6%	1.8%
75 to 79	Male	8,840	9,175	9,071	-3.7%	1.1%
80 to 84	Female	8,400	8,902	8,753	-5.6%	1.7%
80 to 84	Male	5,943	5,900	5,786	0.7%	2%
85 and over	Female	10,994	11,505	11,180	-4.4%	2.9%
85 and over	Male	6,884	7,023	6,666	-2%	5.4%

Source: US Census Bureau