Suffolk County, NY Elevation & Topographic Map

Topographic elevation map of Suffolk County, New York, shaded from 2 ft below sea level on the east side to 390 ft on High Hill
Elevation
400 ft 120 m300 ft 90 m250 ft 75 m150 ft 45 m48 ft 15 m−2 ft −1 m
Zoom in for contour lines
USGS 3DEP · U.S. Census Bureau
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How to use this mapviews, tools and data
Elevation
Ground colored by height from green (lowest) to white (highest), with contour lines every 40–500 ft (USGS data).
Satellite
A 2016 satellite photo at 33 ft (10 m) detail; contours off.
3D
Tilt and turn the terrain; hills are raised 1.5×, or set ×1 for true height.
Click or tap anywhere
The exact elevation of that spot in ft and m.
Measure
Pick two points for the climb, descent and grade along a straight line.
County area
Fades everything outside the official county boundary (US Census).

Elevation Data

Suffolk County averages about 73 ft (22 m) above sea level across all its land. Its ground runs from 2 ft below sea level on the east side to 390 ft on High Hill.

Average elevation
73 ft 22 m
all land inside the county
Highest
390 ft 120 m
on High Hill
Lowest
−2 ft −1 m
on the east side

Suffolk County spans about 392 ft of height, so no single spot tells the whole story. The ruler shows where most of its land lies, and where the other numbers you'll see come from.

FigureElevation
Average of all land73 ft22 m
Highest point
Inside the county, on High Hill (3DEP terrain model; no NGS survey height)
390 ft120 m
Lowest point
Inside the county, on the east side
−2 ft−1 m

Elevation profile, west to east

49 mi west to east through Brookhaven.

Topographic Map

Topographic elevation map of Suffolk County, New York, shaded from 2 ft below sea level on the east side to 390 ft on High Hill
County boundary (dashed) over shaded terrain, with contours every 100 ft (30 m).
Location
County in New York, United States
Population
1,535,909 2024 est.
Land area
910.9 sq mi + 1,462.4 sq mi water
Density
1,686 per sq mi
Time zone
Eastern UTC−5 / −4
Landform region
Coastal Plain 95%
Drains to
Atlantic Ocean 92%
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Sources: U.S. Census Bureau, USGS

Nearby Places

Neighboring counties sharing a border, by average

  1. Fairfield County, CT380 ft
  2. New Haven County, CT310 ft
  3. Middlesex County, CT280 ft
  4. New London County, CT250 ft
  5. Washington County, RI150 ft
  6. Nassau County89 ft
  7. Suffolk County73 ft

Rankings by average elevation

Peaks and hills highest inside

  • High Hill, Suffolk County390 ft
  • Dix Hills350 ft
  • Signal Hill, Suffolk County320 ft
  • Bald Hill, Suffolk County294 ft
  • Rock Hill, Suffolk County260 ft
All 162 towns in Suffolk County by typical elevation
  1. Greenlawn210 ft
  2. East Northport200 ft
  3. West Hills200 ft
  4. South Huntington190 ft
  5. Huntington Station190 ft
  6. Elwood190 ft
  7. Dix Hills180 ft
  8. Huntington180 ft
  9. Cold Spring Harbor180 ft
  10. Port Jefferson Station180 ft
  11. Farmingville160 ft
  12. Head of the Harbor160 ft
  13. Port Jefferson150 ft
  14. Commack150 ft
  15. Kings Park150 ft
  16. Melville150 ft
  17. Sound Beach150 ft
  18. Terryville150 ft
  19. Mount Sinai150 ft
  20. Gordon Heights140 ft
  21. Stony Brook University140 ft
  22. Rocky Point140 ft
  23. Stony Brook140 ft
  24. Miller Place140 ft
  25. East Setauket140 ft
  26. Belle Terre140 ft
  27. St. James130 ft
  28. East Shoreham130 ft
  29. Northport130 ft
  30. Centerport120 ft
  31. Smithtown120 ft
  32. Shoreham120 ft
  33. Baiting Hollow120 ft
  34. Coram120 ft
  35. Selden110 ft
  36. Lloyd Harbor110 ft
  37. Lake Ronkonkoma110 ft
  38. Lake Grove110 ft
  39. Centereach110 ft
  40. Fort Salonga100 ft
  41. Brookhaven100 ft
  42. Wading River100 ft
  43. Nesconset100 ft
  44. Holtsville94 ft
  45. Ridge94 ft
  46. Brentwood93 ft
  47. Medford92 ft
  48. Nissequogue92 ft
  49. Ronkonkoma91 ft
  50. Halesite89 ft
  51. Yaphank87 ft
  52. Middle Island87 ft
  53. Wheatley Heights85 ft
  54. Hauppauge82 ft
  55. Manorville78 ft
  56. Holbrook78 ft
  57. Islandia74 ft
  58. East Farmingdale69 ft
  59. Central Islip68 ft
  60. Deer Park68 ft
  61. North Bay Shore67 ft
  62. Huntington Bay67 ft
  63. Wyandanch63 ft
  64. Northwest Harbor61 ft
  65. Eatons Neck59 ft
  66. Baywood59 ft
  67. Village of the Branch56 ft
  68. Bridgehampton56 ft
  69. Poquott56 ft
  70. Bohemia55 ft
  71. Calverton54 ft
  72. Noyack54 ft
  73. North Bellport53 ft
  74. East Hampton North52 ft
  75. Islip52 ft
  76. Northville50 ft
  77. Old Field49 ft
  78. Setauket49 ft
  79. Montauk47 ft
  80. North Patchogue43 ft
  81. Tuckahoe, Suffolk County43 ft
  82. Shinnecock Hills42 ft
  83. North Amityville41 ft
  84. Mastic41 ft
  85. Shirley41 ft
  86. Riverhead40 ft
  87. North Great River40 ft
  88. East Hampton40 ft
  89. North Babylon39 ft
  90. North Lindenhurst39 ft
  91. Amagansett39 ft
  92. North Sea38 ft
  93. West Babylon38 ft
  94. Babylon37 ft
  95. Village of Southampton36 ft
  96. Hampton Bays36 ft
  97. Wainscott35 ft
  98. Water Mill33 ft
  99. Village of East Hampton33 ft
  100. Westhampton31 ft
  101. Eastport31 ft
  102. Islip Terrace31 ft
  103. Northampton, Suffolk County31 ft
  104. East Moriches31 ft
  105. East Marion31 ft
  106. Southampton30 ft
  107. Sayville29 ft
  108. Bay Shore29 ft
  109. Sag Harbor29 ft
  110. Springs29 ft
  111. East Patchogue28 ft
  112. Moriches28 ft
  113. Sagaponack26 ft
  114. Aquebogue26 ft
  115. Cutchogue26 ft
  116. Shelter Island25 ft
  117. Dering Harbor25 ft
  118. Bellport25 ft
  119. Shelter Island Heights25 ft
  120. East Quogue24 ft
  121. Mattituck24 ft
  122. West Bay Shore24 ft
  123. Quiogue23 ft
  124. Remsenburg-Speonk23 ft
  125. Brightwaters23 ft
  126. Bayport22 ft
  127. West Islip22 ft
  128. Center Moriches22 ft
  129. Westhampton Beach21 ft
  130. Laurel21 ft
  131. Peconic20 ft
  132. West Sayville20 ft
  133. Fishers Island20 ft
  134. New Suffolk20 ft
  135. East Islip19 ft
  136. Southold18 ft
  137. North Haven18 ft
  138. Flanders18 ft
  139. Asharoken18 ft
  140. Lindenhurst18 ft
  141. Riverside18 ft
  142. Blue Point17 ft
  143. Jamesport17 ft
  144. Amityville17 ft
  145. Great River16 ft
  146. Patchogue16 ft
  147. Quogue16 ft
  148. Copiague15 ft
  149. Mastic Beach14 ft
  150. Greenport West12 ft
  151. Village of Babylon11 ft
  152. Village of Greenport10 ft
  153. Orient10 ft
  154. Oakdale8 ft
  155. West Hampton Dunes6 ft
  156. Napeague5 ft
  157. Fire Island4 ft
  158. Ocean Beach3 ft
  159. Saltaire3 ft
  160. Gilgo1 ft
  161. Captree1 ft
  162. Oak Beach−1 ft
How we measure
  • Average: every USGS 3DEP bare-earth cell of land inside the Census county boundary (TIGER/Line, Jan 1 2026), weighted equally, on a 2 arc-second (≈200 ft, 62 m) grid, coarsened from 1 arc-second so the whole area fits one run. Land means the boundary minus Census area water (on this grid, water areas of at least half a cell).
  • Highest and lowest: the highest land cell, re-read at 1 arc-second around the 25 highest grid cells; it is a named summit, so its height is the peak method: the 3DEP top on a ~7 ft (2 m) window, or the NGS published height when a survey mark sits within 160 ft (50 m) of it. Lowest: the lowest land cell, re-read at 1 arc-second around the 25 lowest grid cells; coastal ground within 3 ft (1 m) of named tidal water counts as sea level.
  • Pits: the lowest point is the lowest ground outside closed hollows (quarry floors, mine pits, terrain-model artifacts): any hollow under 0.4 sq mi (1 km²), and any hollow under 2 sq mi (5 km²) whose floor is more than 100 ft (30 m) below its rim; and outside patches below sea level of under 0.4 sq mi (1 km²). The single lowest 3DEP cell, −4 ft at 41.0426° N, 71.9007° W, is in such a hollow or patch and is not counted.
  • Nearby Places: neighboring counties and rankings use each one's average elevation, on its own grid, the same figure its page shows. Peaks and hills: the highest summits inside the county with at least 980 ft (300 m) of prominence, then the highest federal (GNIS) summits inside it when there are fewer than 5; each is the 3DEP top on a ~7 ft (2 m) window, or the NGS published height when a usable survey mark sits within 160 ft (50 m) of it (shown as published).
  • Towns: each town's typical elevation (population-weighted median of its own 2020 blocks at 1 arc-second); a town is listed when any of its 2020 residents live in the county.
  • Rounding: computed heights are rounded to 10 ft (5 m), or to 1 ft (1 m) under 100 ft; 3DEP is good to about a meter, not a foot. Published figures (NGS survey heights) are shown as their publisher gives them.
  • Datum: North American Vertical Datum of 1988 (NAVD 88). NGS plans to replace NAVD 88 with a new datum (NAPGD2022); heights will then shift slightly.
  • Sources: USGS 3DEP, GNIS, Watershed Boundary Dataset and physiographic provinces; U.S. Census Bureau (TIGER boundaries and water, 2020 blocks, 2024 population estimates, county adjacency); NOAA NGS survey heights; BTS time zones. All public domain.