Johnston City, IL Elevation & Topographic Map
Elevation
480 ft 145 m450 ft 140 m440 ft 135 m420 ft 130 m400 ft 120 m390 ft 120 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
Johnston City sits at about 430 ft (130 m) above sea level, worked out from 2020 Census block heights on USGS 3DEP, weighted by residents.
Typical elevation
430 ft 130 m
most residents: 410–450 ft
Lowest
390 ft 120 m
on the west side
Highest
480 ft 145 m
on the north side
Average
430 ft 130 m
all land inside city limits
Johnston City spans about 90 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 | 430 ft130 m |
| Highest point Inside city limits, on the north side | 480 ft145 m |
| Lowest point Inside city limits, on the west side | 390 ft120 m |
| Town center USGS map point for Johnston City | 430 ft130 m |
| Airport (MWA) FAA airport elevation, the highest point of its runways, 5.1 mi southwest of the city limits | 472 ft144 m |
| Average of all land | 430 ft130 m |
Elevation profile, south to north
1.2 mi south to north through the town center.
Topographic Map
- Location
- City in Williamson County, Illinois, United States
- Population
- 3,309 2024 est.
- Land area
- 2.1 sq mi + 0.1 sq mi water
- Density
- 1,564 per sq mi
- Coordinates
- 37.8206° N, 88.9276° W
- Time zone
- Central UTC−6 / −5
- Landform region
- Central Lowland
- Drains to
- Big Muddy River → Mississippi River → Gulf of America
- Airport
- Veterans Airport of Southern Illinois (MWA) 472 ft
- ZIP codes 1
- 62951
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Sources: U.S. Census Bureau, USGS, FAA
Nearby Places
Nearby towns by typical elevation
- Spillertown500 ft
- Pittsburg480 ft
- Energy460 ft
- Whiteash440 ft
- Marion440 ft
- Johnston City430 ft
- Herrin420 ft
- Frankfort Township, Franklin County410 ft
- West Frankfort400 ft
- Denning Township400 ft
- Freeman Spur390 ft
Rankings by typical elevation
- Towns in Illinois2,704th highest of 2,872
- Towns in Williamson County10th highest of 18
Peaks and hills nearest, by height
- McKinney Hill520 ft
- Turkey Knob490 ft
- Indian Hill, Jackson County480 ft
- Browning Hill450 ft
- Dutch Hill, Jackson County440 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).
- 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. All public domain.