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San Mateo County, CA Demographics

San Mateo County, CA is the 15th most populous of 58 counties in California, with 764,461 residents across 449 square miles. That is about 1,704 people per square mile.

At the 2020 census

Population 764,461
Land area 449 sq mi
Density 1,704 / sq mi

Data: 2020 Census · American Community Survey 2024

How San Mateo County compares to the US

We're computing this county's comparison table — check back shortly. Population, land area, and density above are already exact.

Central Location: San Mateo County, CA

Measured from the county's main population center using 2020 census blocks.

We're computing the drive-time and radius areas around San Mateo County, CA — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.

Census tracts in San Mateo County, CA

Name Population Sq mi Per sq mi
Census Tract 6050 8,603 1.6 5,437
Census Tract 6103.03 8,278 1.3 6,202
Census Tract 6087 7,670 1.0 7,908
Census Tract 6008 7,648 0.2 33,445
Census Tract 6089 7,261 2.4 3,078
Census Tract 6014 7,129 0.6 12,544
Census Tract 6024 6,924 1.1 6,588
Census Tract 6132 6,846 15.5 441
Census Tract 6010 6,826 1.0 6,544
Census Tract 6012 6,746 0.8 8,906
Census Tract 6075 6,613 0.8 8,729
Census Tract 6033 6,568 3.1 2,128
Census Tract 6117 6,437 3.9 1,645
Census Tract 6111 6,423 1.3 4,971
Census Tract 6018 6,366 0.7 8,925
Census Tract 6054 6,364 1.0 6,217
Census Tract 6119.02 6,335 0.8 7,707
Census Tract 6088 6,179 1.1 5,593
Census Tract 6140 6,172 1.2 5,050
Census Tract 6016.05 6,157 0.4 16,888
Census Tract 6027 6,080 0.7 8,728
Census Tract 6136 6,053 8.0 756
Census Tract 6135.02 6,047 9.3 649
Census Tract 6110 5,978 0.5 11,256
Census Tract 6139 5,963 1.1 5,664
Census Tract 6080.25 5,931 1.1 5,228
Census Tract 6016.03 5,923 0.5 12,971
Census Tract 6011 5,917 0.4 15,695
Census Tract 6019.02 5,841 0.5 11,562
Census Tract 6056 5,832 3.3 1,759
Census Tract 6106.01 5,797 0.4 16,372
Census Tract 6037 5,667 0.7 7,909
Census Tract 6084 5,664 0.5 11,724
Census Tract 6039 5,590 0.8 7,344
Census Tract 6104 5,580 0.4 14,315
Census Tract 6057 5,563 3.1 1,786
Census Tract 6034 5,561 4.5 1,244
Census Tract 6096.03 5,510 2.3 2,386
Census Tract 6102.01 5,501 0.6 9,845
Census Tract 6015.02 5,479 0.3 17,378
Census Tract 6001 5,474 5.6 972
Census Tract 6006 5,464 0.3 18,393
Census Tract 6044 5,287 0.8 6,687
Census Tract 6038.02 5,267 1.0 5,243
Census Tract 6064 5,261 0.4 14,866
Census Tract 6060 5,242 0.3 17,681
Census Tract 6048 5,207 0.4 13,044
Census Tract 6107 5,200 0.4 12,005
Census Tract 6015.01 5,194 0.3 18,762
Census Tract 6095 5,161 0.7 7,015
Census Tract 6025 5,156 0.5 11,214
Census Tract 6102.02 5,118 0.7 7,767
Census Tract 6053 5,022 0.4 11,773
Census Tract 6085.01 5,013 0.5 10,407
Census Tract 6072 4,971 0.4 12,766
Census Tract 6022.01 4,929 0.2 25,663
Census Tract 6074 4,919 0.4 11,240
Census Tract 6137.02 4,899 40.5 121
Census Tract 6113 4,891 0.7 7,192
Census Tract 6007.01 4,884 0.2 24,173
Census Tract 6041.03 4,847 0.2 21,899
Census Tract 6103.02 4,796 9.3 517
Census Tract 6100 4,782 0.5 9,002
Census Tract 6004.02 4,772 0.2 30,717
Census Tract 6105 4,737 0.5 10,474
Census Tract 6098 4,733 0.8 5,986
Census Tract 6020.01 4,730 0.6 8,382
Census Tract 6086 4,729 0.7 7,234
Census Tract 6125 4,728 0.8 6,119
Census Tract 6129 4,728 0.6 7,695
Census Tract 6108 4,664 0.2 23,927
Census Tract 6126 4,653 0.5 9,252
Census Tract 6028 4,639 0.5 10,027
Census Tract 6013.02 4,629 0.2 20,244
Census Tract 6030 4,597 1.4 3,363
Census Tract 6103.04 4,503 1.2 3,893
Census Tract 6118 4,481 1.8 2,554
Census Tract 6119.01 4,465 0.5 9,797
Census Tract 6097 4,462 2.1 2,143
Census Tract 6114 4,453 3.4 1,310
Census Tract 6061 4,380 1.0 4,419
Census Tract 6002 4,368 0.4 9,942
Census Tract 6092.02 4,357 0.4 12,412
Census Tract 6017 4,313 0.5 8,995
Census Tract 6137.01 4,312 2.0 2,200
Census Tract 6138 4,299 180.6 24
Census Tract 6026.01 4,276 0.3 14,297
Census Tract 6076 4,269 0.5 8,473
Census Tract 6023 4,238 3.9 1,086
Census Tract 6042 4,197 0.7 6,234
Census Tract 6080.13 4,188 0.5 9,289
Census Tract 6121.02 4,187 0.1 34,126
Census Tract 6121.01 4,174 0.3 16,387
Census Tract 6063 4,159 0.4 10,571
Census Tract 6135.01 4,148 32.8 126
Census Tract 6120.01 4,120 0.3 16,274
Census Tract 6019.01 4,117 0.3 12,006
Census Tract 6062.01 4,083 0.2 16,808
Census Tract 6003 4,057 0.8 4,797
Census Tract 6009 4,039 0.8 5,268

Showing the 100 most populous of 173 — the rest are shown on the map.

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About this page

This page shows demographics for a US county from the 2020 census and the American Community Survey: population, land area, density, urban share, and how the county compares to national averages for income, housing, age, and more.

Counties subdivide into census tracts, listed below with their populations. The drive-time and radius tables measure the population around the county's main population center.

Read how BlockAtlas computes population within an area →