Overview

Suffolk County, NY (shown in white) has 910.92 mi² of land area and 1,462.33 mi² of water resources. The county is bordered by:

• Greater Bridgeport Planning Region, CT
• Lower Connecticut River Valley Planning Region, CT
• Nassau County, NY
• South Central Connecticut Planning Region, CT
• Southeastern Connecticut Planning Region, CT
• Washington County, RI
• Western Connecticut Planning Region, CT

The county's elevations range from a low of 0' to a high of 351.1', with a weighted average of 31.6' above sea level.

Temperatures range from average lows around 22.5°F to average highs around 83.7°F. A year-round daily temperature averages 53.2°F. Average annual precipation is 47.5". With these temperatures and precipation, the majority of the county scores as an 7A using the USDA Plant Hardiness Zone Map (the standard by which gardeners and growers can determine which perennial plants are most likely to thrive in a location).

The estimated population of Suffolk County is 1,535,802 with 520,971 households. These households are spread across 159 unique municipalties (not all shown).