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St. Tammany Parish, LA Demographics

St. Tammany Parish, LA is the 4th most populous of 64 counties in Louisiana, with 264,570 residents across 845 square miles. That is about 313 people per square mile.

At the 2020 census

Population 264,570
Land area 845 sq mi
Density 313 / sq mi

Data: 2020 Census · American Community Survey 2024

How St. Tammany Parish 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: St. Tammany Parish, LA

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

We're computing the drive-time and radius areas around St. Tammany Parish, LA — check back shortly. Meanwhile you can drop a pin anywhere in the radius tool.

Census tracts in St. Tammany Parish, LA

Name Population Sq mi Per sq mi
Census Tract 403.09 11,328 24.7 458
Census Tract 404.01 8,037 11.0 733
Census Tract 407.05 7,133 4.5 1,583
Census Tract 408.06 6,945 3.8 1,837
Census Tract 403.08 6,900 24.6 280
Census Tract 403.04 6,732 4.3 1,557
Census Tract 412.11 6,567 2.6 2,497
Census Tract 402.04 6,372 17.8 358
Census Tract 407.08 6,171 49.4 125
Census Tract 407.06 6,079 36.1 169
Census Tract 403.06 5,992 1.9 3,151
Census Tract 410.03 5,738 1.5 3,796
Census Tract 407.10 5,733 2.8 2,030
Census Tract 411.05 5,659 3.5 1,619
Census Tract 401.05 5,656 60.0 94
Census Tract 412.13 5,582 18.7 298
Census Tract 406.09 5,348 1.9 2,768
Census Tract 408.07 5,249 16.5 317
Census Tract 412.09 5,124 1.8 2,863
Census Tract 408.01 4,915 1.8 2,678
Census Tract 401.03 4,848 41.6 116
Census Tract 407.12 4,791 76.4 63
Census Tract 408.05 4,671 1.2 3,919
Census Tract 410.04 4,517 1.5 2,944
Census Tract 412.07 4,472 4.4 1,021
Census Tract 402.05 4,460 21.1 212
Census Tract 406.06 4,408 2.6 1,666
Census Tract 405.02 4,333 7.7 565
Census Tract 412.08 4,294 1.7 2,568
Census Tract 406.01 4,263 5.8 740
Census Tract 407.13 4,237 9.9 429
Census Tract 407.09 4,195 1.7 2,477
Census Tract 401.06 4,190 104.2 40
Census Tract 403.07 4,175 6.4 656
Census Tract 405.01 4,035 2.8 1,429
Census Tract 406.07 3,968 4.5 875
Census Tract 407.11 3,960 2.0 1,951
Census Tract 413.01 3,934 1.9 2,092
Census Tract 402.03 3,919 36.7 107
Census Tract 411.01 3,886 4.2 918
Census Tract 412.12 3,738 11.4 328
Census Tract 401.07 3,555 39.4 90
Census Tract 409 3,535 2.2 1,581
Census Tract 411.03 3,457 4.1 851
Census Tract 412.14 3,451 7.5 462
Census Tract 406.08 3,248 3.5 918
Census Tract 411.04 3,188 7.9 403
Census Tract 412.10 2,991 3.3 908
Census Tract 401.08 2,912 51.9 56
Census Tract 413.02 2,805 1.9 1,500
Census Tract 404.02 2,753 2.7 1,007
Census Tract 410.02 2,711 1.1 2,382
Census Tract 408.04 2,691 1.4 1,968
Census Tract 406.02 2,618 1.8 1,418
Census Tract 402.06 2,557 34.6 74
Census Tract 412.02 2,338 29.9 78
Census Tract 407.14 1,928 10.4 185
Census Tract 411.06 1,278 2.4 529
Census Tract 9900 0 0.0 —

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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 →