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Suffolk County, NY Demographics

Suffolk County, NY is the 4th most populous of 62 counties in New York, with 1,525,856 residents across 911 square miles. That is about 1,675 people per square mile.

At the 2020 census

Population 1,525,856
Land area 911 sq mi
Density 1,675 / sq mi

Data: 2020 Census · American Community Survey 2024

How Suffolk 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: Suffolk County, NY

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

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

Census tracts in Suffolk County, NY

Name Population Sq mi Per sq mi
Census Tract 1580.15 9,343 1.3 7,164
Census Tract 1594.10 8,067 22.0 366
Census Tract 1587.12 7,744 3.4 2,266
Census Tract 1697.01 7,731 9.8 790
Census Tract 1461.05 7,294 0.9 8,283
Census Tract 1224.06 7,088 1.1 6,597
Census Tract 1698 7,070 2.4 2,976
Census Tract 1591.08 7,056 2.9 2,403
Census Tract 1595.11 7,051 1.3 5,375
Census Tract 1237.01 7,050 0.9 8,288
Census Tract 1456.03 7,011 1.4 4,892
Census Tract 1585.10 6,907 1.8 3,932
Census Tract 1354.02 6,785 1.8 3,761
Census Tract 1583.04 6,648 3.6 1,852
Census Tract 1457.02 6,640 1.1 5,812
Census Tract 1585.14 6,613 2.2 3,075
Census Tract 1583.25 6,610 1.5 4,351
Census Tract 1460.05 6,603 1.2 5,480
Census Tract 1583.27 6,601 1.8 3,670
Census Tract 1456.02 6,592 0.6 11,695
Census Tract 1462.04 6,587 0.8 7,992
Census Tract 1585.11 6,581 1.7 3,806
Census Tract 1594.07 6,477 2.4 2,654
Census Tract 1354.01 6,422 2.0 3,183
Census Tract 1475.02 6,374 1.7 3,851
Census Tract 1347.02 6,321 2.5 2,491
Census Tract 1591.03 6,292 3.7 1,717
Census Tract 1583.20 6,172 1.8 3,371
Census Tract 1118.01 6,160 1.8 3,332
Census Tract 1591.06 6,120 7.6 810
Census Tract 1242 6,084 1.0 6,219
Census Tract 1462.03 6,027 0.7 8,588
Census Tract 1475.05 6,014 1.4 4,261
Census Tract 1457.03 6,011 1.0 6,117
Census Tract 1456.01 6,003 0.7 8,981
Census Tract 1478.04 5,973 1.9 3,104
Census Tract 1474.01 5,969 1.2 5,149
Census Tract 1583.06 5,948 2.5 2,387
Census Tract 1235 5,945 1.2 4,979
Census Tract 1229.01 5,905 0.8 7,738
Census Tract 1110.02 5,902 0.8 7,637
Census Tract 1459.03 5,894 1.1 5,547
Census Tract 1230.01 5,894 0.8 7,529
Census Tract 1228.01 5,894 1.7 3,517
Census Tract 1584.07 5,880 1.5 3,916
Census Tract 1108.03 5,867 5.5 1,074
Census Tract 1464.03 5,845 0.6 9,152
Census Tract 1232.04 5,845 1.2 5,066
Census Tract 1588.03 5,825 2.7 2,124
Census Tract 1468 5,783 1.2 4,806
Census Tract 1581.19 5,740 1.5 3,899
Census Tract 1587.11 5,736 2.8 2,025
Census Tract 1594.06 5,703 5.8 978
Census Tract 1117.01 5,693 1.0 5,487
Census Tract 1583.17 5,674 1.3 4,355
Census Tract 1594.16 5,667 1.2 4,846
Census Tract 1595.18 5,648 1.5 3,684
Census Tract 1466.18 5,619 5.3 1,052
Census Tract 1234.04 5,609 0.8 6,901
Census Tract 1122.13 5,566 2.6 2,114
Census Tract 1233.04 5,558 0.5 10,305
Census Tract 1466.14 5,556 1.7 3,182
Census Tract 1460.02 5,499 0.8 6,506
Census Tract 1122.18 5,489 3.2 1,738
Census Tract 1226.03 5,485 1.0 5,316
Census Tract 1457.01 5,432 2.6 2,119
Census Tract 1119 5,385 4.9 1,096
Census Tract 1349.06 5,379 1.3 3,997
Census Tract 1352.05 5,376 2.6 2,082
Census Tract 2010.09 5,369 4.4 1,218
Census Tract 1457.06 5,359 0.8 6,751
Census Tract 1465 5,323 1.3 4,180
Census Tract 1350.02 5,322 1.6 3,368
Census Tract 1592.03 5,301 2.6 2,065
Census Tract 1583.28 5,281 3.6 1,449
Census Tract 1469.01 5,273 1.1 4,614
Census Tract 1476.02 5,256 2.2 2,400
Census Tract 1907.06 5,245 11.8 443
Census Tract 1906.03 5,201 2.5 2,118
Census Tract 1595.16 5,173 1.4 3,828
Census Tract 1588.02 5,156 1.8 2,862
Census Tract 1462.01 5,137 0.6 9,183
Census Tract 1239 5,129 0.6 8,004
Census Tract 1904.05 5,097 11.1 459
Census Tract 1460.01 5,096 0.9 5,931
Census Tract 1351.04 5,081 2.1 2,379
Census Tract 1456.04 5,079 0.6 8,399
Census Tract 1906.04 5,066 3.6 1,388
Census Tract 1596.04 5,058 3.0 1,712
Census Tract 1114.02 5,054 1.1 4,686
Census Tract 1581.02 5,053 1.1 4,711
Census Tract 1462.02 5,047 0.7 7,672
Census Tract 1102 5,019 1.6 3,105
Census Tract 1349.02 5,013 2.6 1,961
Census Tract 1586.06 4,996 1.7 2,943
Census Tract 1245 4,996 0.9 5,324
Census Tract 1120.02 4,958 2.4 2,092
Census Tract 1586.05 4,945 1.8 2,705
Census Tract 1595.13 4,939 1.3 3,769
Census Tract 1466.12 4,908 1.0 4,776

Showing the 100 most populous of 384 — 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.

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