Zip Code 20659
Mechanicsville, Maryland — St. Marys County
📍 ZIP code 20659 is in Mechanicsville, St. Marys County, Maryland.
ZIP code 20659 is located in Mechanicsville, St. Marys County, Maryland. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 23,918. The area code for ZIP code 20659 is 301.
Quick Answer
Zip code 20659 is in Mechanicsville, Maryland (St. Marys County). It has a population of 23,918, median household income of $117,571, and median home value of $388,400.
Population
23,918
Income
$117,571
Home Value
$388,400
Climate
85°F / 25°F
About Zip Code 20659
Zip code 20659 is located in Mechanicsville, Maryland, within St. Marys County. Home to approximately 23,918 residents, this area sits at an elevation of 155 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 301.
The median household income is $117,571 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $388,400, and the cost of living index is 141 (41% above the national average of 100).
Summers average a high of 85°F while winters drop to 25°F. The area receives about 48 in of rain and 15 in of snow annually. The zip code covers 94 square miles of land area and 11 square miles of water.
Key Statistics
23,918
$117,571
$388,400
Eastern (EST/EDT)
301
155 ft
94 sq mi
37.5
8,546
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Compare With Nearby Zip Codes
| Metric | 20659 | 20624 | 20612 | 20621 | 20637 | 20622 |
|---|---|---|---|---|---|---|
| City | Mechanicsville, MD | Clements, MD | Benedict, MD | Chaptico, MD | Hughesville, MD | Charlotte Hall, MD |
| Population | 23,918 | 1,157 | 68 | 902 | 6,337 | 5,259 |
| Median Income | $117,571 | $99,638 | $0 | $0 | $149,821 | $118,938 |
| Home Value | $388,400 | $423,700 | $245,300 | $562,500 | $533,100 | $416,400 |
| Cost of Living | 141 | 165 | 88 | 157 | 186 | 149 |
| Median Age | 37.5 | 40.6 | 75.1 | 60.2 | 44.2 | 44.9 |
Cost of Living
100 = National Average. Mechanicsville's cost of living is 41% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
3.3x
Demographics
Zip code 20659 has a population of 23,918 people with a median age of 37.5. There are 8,546 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Mechanicsville (20659) population trend from 2010 to 2024
↑ 6.1%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
85°F
25°F
48 in
15 in
Mechanicsville experiences warm summers with average highs around 85°F. Winters are cool with lows averaging 25°F. The area receives about 15 in of snow per year.
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Housing & Economy
Median Home Value
$388,400
Median Household Income
$117,571
With 8,546 housing units across 94 square miles, 20659 has a housing density of 91 units per square mile. The home price-to-income ratio is 3.3x.
Location & Geography
Latitude
38.4187°
Longitude
-76.7324°
Land Area
94 sq mi
Water Area
11 sq mi
Nearby Zip Codes
Zip codes closest to 20659 (Mechanicsville, MD) with distances:
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ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 20659's $117,571. A way to compare Mechanicsville to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 20659 (Mechanicsville, MD). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Mechanicsville, Maryland?
Mechanicsville, Maryland uses zip code 20659.
What county is zip code 20659 in?
Zip code 20659 is located in St. Marys County, Maryland.
What is the population of zip code 20659?
The population of zip code 20659 is 23,918 with a median age of 37.5.
Is 20659 in Mechanicsville, Maryland?
Yes, zip code 20659 is in Mechanicsville, St. Marys County, Maryland. The area code is 301.
Frequently Asked Questions
What city is zip code 20659 in?
Zip code 20659 is in Mechanicsville, Maryland. It is part of St. Marys County and uses the Eastern (EST/EDT) timezone.
What is zip code 20659?
Zip code 20659 is a U.S. postal code in Mechanicsville, Maryland (St. Marys County). It has a population of 23,918 and covers 94 square miles.
What is the population of zip code 20659?
The population of zip code 20659 (Mechanicsville, MD) is 23,918 with a median age of 37.5. There are approximately 8,546 housing units in this area.
What is the median income in zip code 20659?
The median household income in zip code 20659 (Mechanicsville, MD) is $117,571 per year. The cost of living index is 141 (100 = national average).
What is the average home price in zip code 20659?
The median home value in zip code 20659 (Mechanicsville, MD) is $388,400. The cost of living index is 141 compared to the national average of 100.
What county is zip code 20659 in?
Zip code 20659 is located in St. Marys County, Maryland. The primary city is Mechanicsville.
What is the area code for zip code 20659?
Zip code 20659 in Mechanicsville, MD uses area code 301. It is located in the Eastern (EST/EDT) timezone.
Is zip code 20659 a good place to live?
Zip code 20659 (Mechanicsville, MD) has a cost of living index of 141 (100 = national average), a median household income of $117,571, and median home values of $388,400. The median age is 37.5. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 20659?
The cost of living index for zip code 20659 (Mechanicsville, MD) is 141, where 100 represents the national average. This area is above the national average. Median home value: $388,400.
What schools serve zip code 20659?
Zip code 20659 in Mechanicsville, Maryland is served by the local school district of St. Marys County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.