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The Borough of Barnum Island is located in Nassau County in the state of New York (NY).

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Barnum Island, New York, a CDP, in Nassau County spans over 1.3 square miles and has a population of 2,414 citizens who are all invited to join us here on our site.
Latest Barnum Island, NY News:

More News Resources for Barnum Island
County Level News: Nassau County News
State Level News: State of New York News
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Barnum Island, NY Map (Interactive)

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Barnum Island Latitude: 40.6062 Longitude: -73.6508

The Zip Code for Barnum Island, NY is: 11558

We also provide additional resources for the rest of Nassau County and the State of New York.

The Borough of Barnum Island

Facts & Data:

Barnum Island New York Physical Characteristics:

The Borough of Barnum Island has an area of 453.2 square miles
  • Land: 284.71470810811 Sq. Mi. (62.82%)
  • Water: 168.51760810811 Sq. Mi.(37.18%)
The Barnum Island Borough takes up 100.0% of the area of Nassau County.

Map Location Coordinates:

  • Latitude: +40.7296870
  • Longitude: -073.5893844
Barnum Island Land Water Pie Chart

Barnum Island, NY Climate Information:

  • Average Temperature: 52.4°F
  • Average Rainfall: 48.26 inches
  • Average Snowfall: 25.5 inches
*Based on annual average for Weather Station USC00306138 OCEANSIDE
Latitude: 40.6328 Longitude: -73.6269 Elevation: 3.7 feet.

Barnum Island, NY Population Data:

According to the 2010 U.S. Census, the population of Barnum Island was 1,339,532 people, which is 100.0 % of the entire population of Nassau County.


  • 48.37% Male
  • 51.63% Female


  • 72.979% White
  • 11.127% Black
  • 7.634% Asian
  • 0.24% American Indian/Alaskan Native
  • 0.03% Pacific Islander
  • 2.382% Mixed
  • 5.615% Other


  • 85.42% Not Hispanic or Latino
  • 14.58% Hispanic or Latino
Barnum Island Race Population Ring Chart

Barnum Island, NY Housing Information:

Average Household Size: 2.9
Number of Residences: 468,346
  • Occupied: 448,528 (95.77%)
  • Vacant: 19,818 (4.23%)

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