Selden, NY Elevation & Topographic Map
Elevation
240 ft 75 m200 ft 60 m180 ft 55 m140 ft 45 m100 ft 30 m80 ft 25 m
Contours every 100 ft, bold every 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.
- Area
- Fades everything outside the official CDP boundary (US Census).
Elevation Data
Selden sits at about 110 ft (35 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.
Typical elevation
110 ft 35 m
most residents: 93–140 ft
Lowest
80 ft 25 m
near the middle
Highest
240 ft 75 m
on the southwest side
Average
120 ft 35 m
all land inside the CDP boundary
Selden spans about 160 ft of height, so no single spot tells the whole story. The ruler shows where its people live, and where the other numbers you'll see come from.
| Figure | Elevation |
|---|---|
| Typical Where people live: half of residents higher, half lower | 110 ft35 m |
| Highest point Inside the CDP boundary, on the southwest side | 240 ft75 m |
| Lowest point Inside the CDP boundary, near the middle | 80 ft25 m |
| Town center USGS map point for Selden | 87 ft26 m |
| Airport (ISP) FAA airport elevation, the highest point of its runways, 3.8 mi southwest of the CDP boundary | 99 ft30 m |
| Average of all land | 120 ft35 m |
Elevation profile, south to north
2.4 mi south to north through the town center.
Topographic Map
- Location
- Unincorporated community (census-designated place) in Suffolk County, New York, United States
- Population
- 21,262 2020 Census
- Land area
- 4.5 sq mi
- Density
- 4,674 per sq mi
- Coordinates
- 40.8665° N, 73.0357° W
- Time zone
- Eastern UTC−5 / −4
- Landform region
- Coastal Plain
- Drains to
- Atlantic Ocean
- Airport
- Long Island Mac Arthur (ISP) 99 ft
- ZIP codes 1
- 11784
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Sources: U.S. Census Bureau, USGS, FAA
Nearby Places
Nearby towns by typical elevation
- Port Jefferson Station180 ft
- Farmingville160 ft
- Terryville150 ft
- Gordon Heights140 ft
- Coram120 ft
- Selden110 ft
- Lake Grove110 ft
- Centereach110 ft
- Holtsville94 ft
- Medford92 ft
- Holbrook78 ft
Rankings by typical elevation
- Towns in New York1,845th highest of 2,097
- Towns in Suffolk County35th highest of 162
Peaks and hills nearest, by height
- South Beacon Mountain1,600 ft
- Dix Hills350 ft
- Rock Hill, Suffolk County260 ft
- Mount Misery, Suffolk County180 ft
How we measure
- Typical elevation: the population-weighted median: every 2020 Census block inside the CDP boundary, at its USGS 3DEP height, weighted by the people who live there. Half of residents live higher, half lower.
- Lowest, highest, average: USGS 3DEP bare-earth heights on a 1 arc-second (≈100 ft, 30 m) grid, land only, inside the Census CDP boundary (TIGER, Jan 1 2026).
- 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, 73 ft at 40.8729° N, 73.0446° W, is in such a hollow or patch and is not counted.
- Nearby Places: nearby towns and rankings use each town's typical elevation, so every town is compared like for like. Rankings count every city, town, township and census-designated place, including places inside a town. Peaks and hills: the nearest summits with at least 980 ft (300 m) of prominence within 62 mi (100 km), then federal (GNIS) summits within 16 mi (25 km) 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).
- 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 (FAA airport elevation, 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.
- Selden is an unincorporated community; figures cover the census-designated place, a statistical area.
- Sources: USGS 3DEP, GNIS, Watershed Boundary Dataset and physiographic provinces; U.S. Census Bureau (boundaries, 2020 blocks, Gazetteer areas, ZIP code areas); FAA airport data; BTS time zones. All public domain.