Nassau County, NY Elevation & Topographic Map
Elevation
370 ft 110 m280 ft 85 m230 ft 70 m140 ft 40 m46 ft 14 m0 ft 0 m
Contours every 500 ft, bold every 2,500 ft
USGS 3DEP · U.S. Census Bureau
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
Nassau County averages about 89 ft (27 m) above sea level across all its land. Its ground runs from sea level on Jones Bay to 370 ft on Harbor Hill.
Average elevation
89 ft 27 m
all land inside the county
Highest
370 ft 110 m
on Harbor Hill
Lowest
0 ft 0 m
at sea level on Jones Bay
Nassau County spans about 370 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.
| Figure | Elevation |
|---|---|
| Average of all land | 89 ft27 m |
| Highest point Inside the county, on Harbor Hill (3DEP terrain model; no NGS survey height) | 370 ft110 m |
| Lowest point Where the land meets Jones Bay | 0 ft0 m |
Elevation profile, south to north
29 mi south to north through Hempstead.
Topographic Map
- Location
- County in New York, United States
- Population
- 1,392,438 2024 est.
- Land area
- 284.5 sq mi + 168.8 sq mi water
- Density
- 4,894 per sq mi
- Time zone
- Eastern UTC−5 / −4
- Landform region
- Coastal Plain 90%
- Drains to
- Atlantic Ocean 67%, Long Island Sound 33%
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Sources: U.S. Census Bureau, USGS
Nearby Places
Neighboring counties sharing a border, by average
- Fairfield County, CT380 ft
- Westchester County360 ft
- Nassau County89 ft
- Suffolk County73 ft
- Bronx County62 ft
- Queens County50 ft
Rankings by average elevation
- Counties in New York56th highest of 62
- Counties in the United States2,944th highest of 3,151
Peaks and hills highest inside
- Harbor Hill, Nassau County370 ft
- Mannetto Hills300 ft
- Sagamore Hill170 ft
All 135 towns in Nassau County by typical elevation
- Woodbury, Nassau County240 ft
- Roslyn Estates230 ft
- Muttontown230 ft
- Laurel Hollow220 ft
- Oyster Bay Cove210 ft
- Brookville210 ft
- Syosset200 ft
- East Norwich190 ft
- Roslyn190 ft
- North Hills190 ft
- Lake Success180 ft
- East Hills180 ft
- Munsey Park170 ft
- Upper Brookville170 ft
- Greenvale170 ft
- Old Westbury170 ft
- Jericho170 ft
- Plainview160 ft
- Sea Cliff160 ft
- Old Bethpage160 ft
- Flower Hill160 ft
- Thomaston160 ft
- Glen Head150 ft
- Matinecock150 ft
- Roslyn Heights140 ft
- Manhasset140 ft
- Cove Neck140 ft
- Hicksville140 ft
- Old Brookville140 ft
- Searingtown140 ft
- Albertson130 ft
- Locust Valley130 ft
- Russell Gardens130 ft
- Manhasset Hills130 ft
- Glen Cove130 ft
- Roslyn Harbor130 ft
- New Cassel130 ft
- Kensington120 ft
- Oyster Bay120 ft
- Glenwood Landing120 ft
- Williston Park120 ft
- North New Hyde Park110 ft
- East Williston110 ft
- Westbury110 ft
- Herricks110 ft
- Bethpage110 ft
- North Hempstead110 ft
- Great Neck Gardens110 ft
- Mill Neck110 ft
- Mineola110 ft
- Port Washington110 ft
- Salisbury110 ft
- Garden City Park100 ft
- Great Neck Plaza100 ft
- Carle Place99 ft
- New Hyde Park98 ft
- University Gardens87 ft
- Floral Park85 ft
- Garden City85 ft
- Bellerose83 ft
- Levittown83 ft
- Great Neck83 ft
- Stewart Manor81 ft
- Bellerose Terrace81 ft
- Plandome Heights80 ft
- Great Neck Estates78 ft
- Plainedge77 ft
- Plandome75 ft
- East Meadow71 ft
- Farmingdale71 ft
- South Floral Park71 ft
- Garden City South71 ft
- Uniondale63 ft
- Harbor Hills63 ft
- Village of Hempstead62 ft
- Elmont60 ft
- Saddle Rock60 ft
- Sands Point57 ft
- Franklin Square57 ft
- South Farmingdale56 ft
- Centre Island55 ft
- West Hempstead55 ft
- Kings Point54 ft
- North Massapequa54 ft
- Lattingtown50 ft
- North Wantagh47 ft
- South Hempstead45 ft
- Plandome Manor43 ft
- North Merrick41 ft
- North Bellmore41 ft
- Malverne Park Oaks41 ft
- Roosevelt40 ft
- North Valley Stream40 ft
- Hempstead38 ft
- Lakeview33 ft
- Malverne32 ft
- Rockville Centre28 ft
- Massapequa Park28 ft
- Port Washington North28 ft
- North Lynbrook27 ft
- Wantagh25 ft
- Saddle Rock Estates25 ft
- Baldwin21 ft
- Lynbrook21 ft
- Hewlett20 ft
- Cedarhurst20 ft
- Lawrence19 ft
- Valley Stream19 ft
- Baxter Estates19 ft
- Freeport19 ft
- Manorhaven17 ft
- Bayville17 ft
- East Massapequa17 ft
- Woodsburgh16 ft
- Hewlett Bay Park14 ft
- Inwood13 ft
- Hewlett Neck13 ft
- Seaford12 ft
- Merrick11 ft
- East Rockaway10 ft
- Atlantic Beach10 ft
- Oceanside10 ft
- Massapequa10 ft
- Bellmore9 ft
- Hewlett Harbor9 ft
- East Atlantic Beach9 ft
- Woodmere9 ft
- Harbor Isle8 ft
- Point Lookout8 ft
- South Valley Stream8 ft
- Long Beach8 ft
- Lido Beach8 ft
- Bay Park6 ft
- Barnum Island6 ft
- Island Park6 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 1 arc-second (≈100 ft, 30 m) grid. Land means the boundary minus Census area water.
- Highest and lowest: the highest land cell; 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; 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 40.8843° N, 73.5463° W, is in such a hollow or patch and is not counted; this coastal land's lowest point is sea level on the coast.
- 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.