Zip Code 20646
La Plata, Maryland — Charles County
📍 ZIP code 20646 is in La Plata, Charles County, Maryland.
ZIP code 20646 is located in La Plata, Charles County, Maryland. It is a zip code in the Eastern (EST/EDT) Time Zone with an estimated population of 21,601. The area code for ZIP code 20646 is 301.
Quick Answer
Zip code 20646 is in La Plata, Maryland (Charles County). It has a population of 21,601, median household income of $130,008, and median home value of $435,100.
Population
21,601
Income
$130,008
Home Value
$435,100
Climate
85°F / 25°F
About Zip Code 20646
Zip code 20646 is located in La Plata, Maryland, within Charles County. Home to approximately 21,601 residents, this area sits at an elevation of 145 ft and falls within the Eastern (EST/EDT) timezone. The local area code is 301.
The median household income is $130,008 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $435,100, and the cost of living index is 162 (62% 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 82.6 square miles of land area and 0.7 square miles of water.
Key Statistics
21,601
$130,008
$435,100
Eastern (EST/EDT)
301
145 ft
82.6 sq mi
43.4
8,263
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Compare With Nearby Zip Codes
| Metric | 20646 | 20677 | 20675 | 20611 | 20695 | 20693 |
|---|---|---|---|---|---|---|
| City | La Plata, MD | Port Tobacco, MD | Pomfret, MD | Faulkner, MD | Waldorf, MD | Welcome, MD |
| Population | 21,601 | 2,113 | 1,836 | 1,128 | 12,725 | 1,238 |
| Median Income | $130,008 | $150,956 | $116,439 | $132,917 | $118,949 | $148,750 |
| Home Value | $435,100 | $525,400 | $436,900 | $395,400 | $446,700 | $428,900 |
| Cost of Living | 162 | 194 | 159 | 152 | 152 | 169 |
| Median Age | 43.4 | 48.8 | 51.6 | 43.7 | 39.2 | 31.4 |
Cost of Living
100 = National Average. La Plata's cost of living is 62% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
3.3x
Demographics
Zip code 20646 has a population of 21,601 people with a median age of 43.4. There are 8,263 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
La Plata (20646) population trend from 2010 to 2024
↓ -6.3%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
85°F
25°F
48 in
15 in
La Plata 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
$435,100
Median Household Income
$130,008
With 8,263 housing units across 82.6 square miles, 20646 has a housing density of 100 units per square mile. The home price-to-income ratio is 3.3x.
Location & Geography
Latitude
38.5243°
Longitude
-77.0007°
Land Area
82.6 sq mi
Water Area
0.7 sq mi
Nearby Zip Codes
Zip codes closest to 20646 (La Plata, 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 20646's $130,008. A way to compare La Plata 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 20646 (La Plata, 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 La Plata, Maryland?
La Plata, Maryland uses zip code 20646.
What county is zip code 20646 in?
Zip code 20646 is located in Charles County, Maryland.
What is the population of zip code 20646?
The population of zip code 20646 is 21,601 with a median age of 43.4.
Is 20646 in La Plata, Maryland?
Yes, zip code 20646 is in La Plata, Charles County, Maryland. The area code is 301.
Frequently Asked Questions
What city is zip code 20646 in?
Zip code 20646 is in La Plata, Maryland. It is part of Charles County and uses the Eastern (EST/EDT) timezone.
What is zip code 20646?
Zip code 20646 is a U.S. postal code in La Plata, Maryland (Charles County). It has a population of 21,601 and covers 82.6 square miles.
What is the population of zip code 20646?
The population of zip code 20646 (La Plata, MD) is 21,601 with a median age of 43.4. There are approximately 8,263 housing units in this area.
What is the median income in zip code 20646?
The median household income in zip code 20646 (La Plata, MD) is $130,008 per year. The cost of living index is 162 (100 = national average).
What is the average home price in zip code 20646?
The median home value in zip code 20646 (La Plata, MD) is $435,100. The cost of living index is 162 compared to the national average of 100.
What county is zip code 20646 in?
Zip code 20646 is located in Charles County, Maryland. The primary city is La Plata.
What is the area code for zip code 20646?
Zip code 20646 in La Plata, MD uses area code 301. It is located in the Eastern (EST/EDT) timezone.
Is zip code 20646 a good place to live?
Zip code 20646 (La Plata, MD) has a cost of living index of 162 (100 = national average), a median household income of $130,008, and median home values of $435,100. The median age is 43.4. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 20646?
The cost of living index for zip code 20646 (La Plata, MD) is 162, where 100 represents the national average. This area is above the national average. Median home value: $435,100.
What schools serve zip code 20646?
Zip code 20646 in La Plata, Maryland is served by the local school district of Charles 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.