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San Luis Obispo County, CA Demographics

San Luis Obispo County, CA is the 23rd most populous of 58 counties in California, with 282,424 residents across 3,301 square miles. That is about 86 people per square mile.

At the 2020 census

Population 282,424
Land area 3,301 sq mi
Density 86 / sq mi

Data: 2020 Census · American Community Survey 2024

How San Luis Obispo 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 Luis Obispo 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 Luis Obispo County, CA — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.

Census tracts in San Luis Obispo County, CA

Name Population Sq mi Per sq mi
Census Tract 113 7,850 4.0 1,946
Census Tract 118 7,510 5.8 1,296
Census Tract 109.03 7,459 0.7 10,556
Census Tract 119.04 7,289 0.9 8,286
Census Tract 125.03 6,462 1.8 3,640
Census Tract 126.01 6,319 3.5 1,826
Census Tract 124.04 6,295 3.3 1,908
Census Tract 102.04 6,120 1.3 4,596
Census Tract 127.05 6,120 98.2 62
Census Tract 123.05 5,987 13.8 433
Census Tract 107.07 5,874 5.4 1,084
Census Tract 123.02 5,774 363.9 16
Census Tract 100.16 5,643 105.9 53
Census Tract 110.01 5,603 3.4 1,668
Census Tract 131 5,566 87.6 64
Census Tract 102.02 5,499 5.3 1,046
Census Tract 121.02 5,482 1.2 4,573
Census Tract 125.02 5,201 1.9 2,716
Census Tract 125.05 4,971 3.1 1,579
Census Tract 115.05 4,920 119.6 41
Census Tract 123.06 4,770 51.2 93
Census Tract 127.07 4,752 9.1 523
Census Tract 107.01 4,717 0.9 5,089
Census Tract 120.02 4,612 0.6 7,406
Census Tract 102.05 4,470 0.9 4,792
Census Tract 116 4,334 65.0 67
Census Tract 112.01 4,276 2.9 1,453
Census Tract 102.07 4,256 15.0 284
Census Tract 127.06 4,233 35.3 120
Census Tract 102.06 4,001 1.7 2,370
Census Tract 106.02 3,956 2.0 1,955
Census Tract 103.01 3,949 405.8 10
Census Tract 124.03 3,903 2.9 1,369
Census Tract 114 3,806 0.4 9,525
Census Tract 122.02 3,785 0.7 5,453
Census Tract 109.02 3,726 0.5 7,735
Census Tract 124.06 3,677 2.9 1,273
Census Tract 111.01 3,666 0.6 5,857
Census Tract 101.03 3,621 1.4 2,501
Census Tract 100.17 3,618 200.2 18
Census Tract 111.05 3,534 0.5 7,760
Census Tract 111.03 3,522 1.9 1,835
Census Tract 117.04 3,514 1.3 2,703
Census Tract 112.02 3,502 2.9 1,224
Census Tract 107.03 3,497 1.5 2,259
Census Tract 104.03 3,466 5.1 676
Census Tract 103.02 3,394 36.5 93
Census Tract 124.05 3,303 1.8 1,843
Census Tract 101.04 3,285 1.0 3,336
Census Tract 109.04 3,284 6.3 519
Census Tract 105.05 3,280 1.2 2,717
Census Tract 103.03 3,241 206.1 16
Census Tract 122.01 3,185 1.1 2,775
Census Tract 117.06 3,105 7.9 395
Census Tract 119.01 3,101 2.3 1,371
Census Tract 110.02 2,933 2.1 1,416
Census Tract 130 2,644 353.6 7
Census Tract 120.01 2,549 0.3 7,408
Census Tract 105.04 2,505 3.1 808
Census Tract 105.06 2,338 1.5 1,576
Census Tract 104.04 2,219 4.6 486
Census Tract 111.04 2,063 0.4 4,763
Census Tract 115.01 1,788 0.5 3,310
Census Tract 126.02 1,760 1.7 1,028
Census Tract 119.03 1,725 0.5 3,818
Census Tract 101.01 1,672 9.2 182
Census Tract 117.05 1,462 0.6 2,321
Census Tract 106.03 1,407 4.1 339
Census Tract 127.08 1,074 1,010.6 1

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Metro areas containing San Luis Obispo County

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 →