Bay St. Louis, MS GIS Map
Bay St. Louis is a city in Hancock County, Mississippi, with a population of about 13,199. The map below shows its location, boundary and surrounding roads, with federal GIS layers you can turn on for the area.
- County
- Hancock County
- Population
- 13,199
- Elevation
- 24 ft
- Coordinates
- 30.3088, -89.3301
- ZIP codes (2)
- 39520, 39521
- Land area
- 14.7 sq mi
- Time zone
- America/Chicago
About Bay St. Louis, MS
Bay St. Louis is a city in and the county seat of Hancock County, Mississippi, in the United States. Located on the Gulf Coast on the west side of the Bay of St. Louis, it is part of the Gulfport-Biloxi metropolitan area. The population was 9,284 at the 2020 census, up from 9,260 at the 2010 census.
Source: Wikipedia (CC BY-SA 4.0)
Cities Near Bay St. Louis
GIS Data for Bay St. Louis, MS
The Bay St. Louis map loads live federal GIS layers in your browser, so you can check flood zones, terrain, land cover and district boundaries for any address in Bay St. Louis without a separate GIS login. Everything below is drawn from public U.S. government data.
Layers you can turn on
FEMA flood zones
National Flood Hazard Layer — flood insurance rate map zones.
Elevation contours and hillshade
USGS 3DEP terrain, so you can read slope and relief.
Land cover
NLCD land cover classes — forest, developed, wetland, water.
School districts
Census TIGER unified and elementary school district boundaries.
ZIP code and county boundaries
Census TIGER ZCTA and county boundary lines.
Map tools
Measure distance and area
Draw a line or polygon to get length in miles or area in acres.
Sketch and annotate
Add points, lines and shapes on top of the map.
Inspect any point
Click the map to read coordinates, elevation and the layers under your cursor.
Download the map
Save the current view as a PNG image.
Bay St. Louis Demographics
Source: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates.
Population
10,188
Households
5,088
Median household income
$67,442
Median age
53.3 years
Median home value
$260,200
Median gross rent
$1,179/mo
Owner-occupied homes
76.7%
Bachelor's degree or higher
38.3%
Below poverty level
14.5%
Land area
14.7 sq mi
Population density
693 / sq mi
County
ZIP codes in Bay St. Louis
Bay St. Louis Population Growth
Source: U.S. Census Bureau, 2010 Census and Population Estimates Program (Vintage 2024: April 2020 estimates base and July 1, 2024 estimate).
2010 Census
9,260
April 2020 (estimates base)
9,290
July 2024 estimate
10,526
Change 2010-2020
+0.3%
Change 2020-2024
+13.3%
Photos of Bay St. Louis
Hover over a photo to see it larger. Tap on mobile.
Photos from Wikimedia Commons, taken in or near Bay St. Louis. Credits and licenses are shown in the larger view.
Soils of Bay St. Louis
General soil map unit at the city center: Harleston-Beauregard-Atmore
Soil Properties
- Drainage class
- Moderately well drained
- Hydrologic soil group
- C (slow infiltration)
- Available water storage (0–150 cm)
- 27.6 cm
- Typical slope
- 1%
- Flooding frequency
- None
- Min. annual water table depth
- 15 cm
Soil Components
- Atmore34%
Ultisols · Plinthic Paleaquults
- Beauregard34%
Ultisols · Plinthaquic Paleudults
- Harleston17%
Ultisols · Aquic Paleudults
- Escambia7%
Ultisols · Plinthaquic Paleudults
- Saucier5%
Ultisols · Plinthaquic Paleudults
- Handsboro3%
Histosols · Typic Sulfihemists
Source: USDA NRCS U.S. General Soil Map (STATSGO2). General soil map data (1:250,000 scale) is not suitable for site-specific decisions.
Climate of Bay St. Louis
30-year averages (1991–2020) from the Waveland, Ms weather station, elevation 8 ft, 3.3 miles from the city center.
Warmest month
Aug · avg high 89°F
Coldest month
Jan · avg low 42°F
Annual precipitation
65.0 in
Average Monthly Temperatures (°F)
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 59 | 63 | 69 | 75 | 82 | 87 | 88 | 89 | 86 | 78 | 68 | 61 |
| Avg low °F | 42 | 44 | 51 | 58 | 66 | 72 | 74 | 74 | 70 | 59 | 49 | 43 |
| Precip. in | 5.83 | 4.67 | 5.31 | 5.57 | 5.75 | 6.45 | 7.72 | 5.90 | 5.72 | 3.53 | 4.14 | 4.40 |
Source: NOAA NCEI U.S. Climate Normals, 1991–2020. Conditions at the station may differ from other parts of the city.
Natural Hazard Risk in Bay St. Louis
FEMA National Risk Index ratings for Hancock County, compared with all U.S. counties.
Overall risk
Score 82.7 of 100
Expected annual loss
Buildings, population & agriculture
Social vulnerability
Susceptibility to hazard impacts
Community resilience
Ability to prepare & recover
Risk by Hazard
- HurricaneRelatively High
- LightningRelatively High
- WildfireRelatively Moderate
- Coastal FloodingRelatively High
- Heat WaveRelatively Low
- TornadoRelatively Moderate
- Inland FloodingRelatively Low
- Cold WaveRelatively Low
- DroughtRelatively Low
- HailRelatively Low
- EarthquakeVery Low
- Ice StormRelatively Low
- Strong WindRelatively Low
- Winter WeatherRelatively Low
- LandslideVery Low
Source: FEMA National Risk Index (December 2025 release). County-level ratings are relative to other U.S. counties and are not a property-specific assessment.
Bay St. Louis FAQ
What county is Bay St. Louis in?
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Bay St. Louis, Mississippi is located in Hancock County.
What is the population of Bay St. Louis?
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Bay St. Louis has a population of about 13,199, making it the number 31 of the 42 Mississippi cities listed on GIS Map.
What is the elevation of Bay St. Louis?
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The elevation of Bay St. Louis is approximately 24 feet (7 meters) above sea level at the city center.
What ZIP codes are in Bay St. Louis?
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ZIP codes for Bay St. Louis include 39520, 39521.
What time zone is Bay St. Louis in?
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Bay St. Louis is in the Central Time zone (America/Chicago).
How far is Bay St. Louis from Jackson?
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Bay St. Louis is about 146 miles from Jackson, the capital of Mississippi, in a straight line.
What cities are near Bay St. Louis?
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Cities near Bay St. Louis include Long Beach, MS (11 miles); Gulfport, MS (15 miles); Picayune, MS (26 miles); Slidell, LA (27 miles); Biloxi, MS (27 miles).
Local notes for Bay St. Louis, MS
Questions and local knowledge from people who know the area. Every note is read before it appears here.