Olney, IL Elevation & Topographic Map
Elevation
530 ft 160 m500 ft 150 m490 ft 150 m460 ft 140 m430 ft 130 m420 ft 125 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.
- City area
- Fades everything outside the official city limits (US Census).
Elevation Data
Olney sits at about 480 ft (150 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.
Typical elevation
480 ft 150 m
most residents: 450–500 ft
Lowest
420 ft 125 m
on the southwest side
Highest
530 ft 160 m
on the east side
Average
470 ft 145 m
all land inside city limits
Olney spans about 110 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 | 480 ft150 m |
| Highest point Inside city limits, on the east side | 530 ft160 m |
| Lowest point Inside city limits, on the southwest side | 420 ft125 m |
| Town center USGS map point for Olney | 480 ft145 m |
| Airport (OLY) FAA airport elevation, the highest point of its runways, 2.5 mi west of the city limits | 482 ft147 m |
| Average of all land | 470 ft145 m |
Elevation profile, west to east
2.6 mi west to east through the town center.
Topographic Map
- Location
- City in Richland County, Illinois, United States
- Population
- 8,431 2024 est.
- Land area
- 7.0 sq mi
- Density
- 1,211 per sq mi
- Coordinates
- 38.7309° N, 88.0853° W
- Time zone
- Central UTC−6 / −5
- Landform region
- Central Lowland
- Drains to
- Little Wabash River → Ohio River → Mississippi River → Gulf of America
- Airport
- Olney-Noble (OLY) 482 ft
- ZIP codes 1
- 62450
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Sources: U.S. Census Bureau, USGS, FAA
Nearby Places
Nearby towns by typical elevation
- Calhoun530 ft
- Claremont Township510 ft
- Claremont510 ft
- Olney480 ft
- German Township480 ft
- Olney Township480 ft
- Madison Township480 ft
- Dundas480 ft
- Preston Township480 ft
- Noble470 ft
- Noble Township470 ft
Rankings by typical elevation
- Towns in Illinois2,491st highest of 2,872
- Towns in Richland County5th highest of 15
Peaks and hills nearest, by height
- Red Hill631 ft
- Onion Hill560 ft
- Indian Mound520 ft
- Turkey Point500 ft
- Indian Point490 ft
How we measure
- Typical elevation: the population-weighted median: every 2020 Census block inside the city limits, 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 city limits (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, 410 ft at 38.7137° N, 88.1143° 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.
- Sources: USGS 3DEP, GNIS, Watershed Boundary Dataset and physiographic provinces; U.S. Census Bureau (boundaries, 2020 blocks, 2024 population estimates, Gazetteer areas, ZIP code areas); FAA airport data; BTS time zones; NOAA NGS survey heights. All public domain.