What city is 20646 in?

20646 is a La Plata, MD mailing address. By land area, 9% lies inside La Plata and 5% lies inside Bryans Road; the rest is outside any Census-defined city or community.

What is the population of 20646?

About 21,400 people (±952), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 20,411.

What is the median household income in 20646?

$131,974 (±$10,208), compared with $103,678 for Maryland as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 20646?

17 USPS carrier routes with 9,494 residential and 496 business mailboxes (9,990 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 20646?

The closest, measured center to center: 20677 (2.7 mi, Port Tobacco Village), 20675 (4.4 mi, Pomfret), 20611 (4.6 mi), 20695 (4.8 mi, Waldorf), 20693 (6.4 mi) and 20602 (7.1 mi, Waldorf).

20646 ZIP Code, La Plata, MD

20646 is a ZIP code in La Plata, Maryland in Charles County. It covers 80 square miles of land. The closest ZIP codes are 20677, 20675 and 20611. 21,400 people live here in 7,756 households. With about 268 people per square mile it is lightly settled, and most homes are owner-occupied (87%). Median household income is $131,974, above the Maryland median of $103,678.

Quick facts

Mailing city: La Plata, MD
County: Charles County
Land area: 80 sq mi
Population: 21,400
Median household income: $131,974
Carrier routes: 17 (9,494 homes)

Key figures

Measure	Value
Residents	21,400
Households	7,756
Median household income	$131,974
Income per person	$55,317
Median age	42.9
Homeowners	86.5%
Median home value	$450,200
Median rent	$1,541
Bachelor's degree or higher	34.9%
Average commute (minutes)	38.8
Households with kids under 18	32.5%
Moved in the past year	10.4%
Below the poverty line	5.6%
Broadband internet	93.7%
Speak a non-English language at home	6.2%

Household income

% of households	Value
<$10K	2.8%
$10–15K	1.8%
$15–25K	2.9%
$25–35K	2.7%
$35–50K	5.2%
$50–75K	13.3%
$75–100K	9.0%
$100–150K	20.6%
$150–200K	13.8%
$200K+	27.9%

Age

% of all residents	Value
<10	9.3%
10–19	14.9%
20–24	6.0%
25–34	9.1%
35–44	14.3%
45–54	13.7%
55–64	14.8%
65–74	10.0%
75+	8.0%

Tenure

% of housing units	Value
Owned, with mortgage	61.0%
Owned outright	19.8%
Rented	12.4%
Vacant	6.8%

Type of building

% of housing units	Value
Detached house	72.5%
Townhome	17.7%
2–4 units	0.7%
5–19 units	3.1%
20+ units	4.7%
Mobile / other	1.2%

Businesses in 20646

528 business establishments with 7,759 employees (ZIP Codes Business Patterns 2023).

Construction: 78
Health Care and Social Assistance: 72
Professional, Scientific, and Technical Services: 69
Accommodation and Food Services: 66
Retail Trade: 59
Other Services (except Public Administration): 57
Administrative and Support and Waste Management and Remediation Services: 25
Real Estate and Rental and Leasing: 24

EDDM carrier routes

20646 has 17 USPS carrier routes with 9,494 residential and 496 business mailboxes. Open the EDDM route map.

Carrier routes in 20646

20646 has 17 USPS carrier routes (8 rural (R), 9 highway contract (H)) with 9,494 residential and 496 business mailboxes. Routes range from 260 homes (H001) to 1,294 homes (R204); the median route has 535 homes. The Census counted 7,756 households in 20646 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	7
500–749	8
750–999	1
1,000–1,499	1
1,500+	0

Best routes in 20646 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route R215 — USPS business mailboxes 265, 596 homes
Route R216 — USPS business mailboxes 88, 735 homes
Route H003 — USPS business mailboxes 51, 434 homes
Route R204 — USPS business mailboxes 22, 1,294 homes
Route R207 — USPS business mailboxes 16, 628 homes

Select these 5 routes on the route map

Every carrier route in 20646

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
H001	Highway contract	260	1	$128,140	—	—	—
H003	Highway contract	434	51	$116,103	—	—	—
H006	Highway contract	494	5	$114,510	—	—	—
H009	Highway contract	538	0	$160,266	—	—	—
H010	Highway contract	387	0	$106,033	—	—	—
H012	Highway contract	553	12	$114,510	—	—	—
H013	Highway contract	349	0	$166,140	—	—	—
H014	Highway contract	393	7	$160,266	—	—	—
H017	Highway contract	288	12	$62,012	—	—	—
R202	Rural	535	11	$85,484	—	—	—
R204	Rural	1,294	22	$92,632	—	—	—
R205	Rural	707	2	$121,668	—	—	—
R207	Rural	628	16	$99,570	—	—	—
R208	Rural	507	2	$164,877	—	—	—
R211	Rural	796	2	$169,825	—	—	—
R215	Rural	596	265	$62,012	—	—	—
R216	Rural	735	88	$116,103	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 20646 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

20677 — Port Tobacco Village town, MD (2.7 mi)
20675 — Pomfret CDP, MD (4.4 mi)
20611 (4.6 mi)
20695 — Waldorf CDP, MD (4.8 mi)
20693 (6.4 mi)
20602 — Waldorf CDP, MD (7.1 mi)
20632 (7.2 mi)
20603 — Bensville CDP, MD (7.6 mi)

Areas that include 20646

Mail every home in 20646

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 20646, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 20646 in?: 20646 is a La Plata, MD mailing address. By land area, 9% lies inside La Plata and 5% lies inside Bryans Road; the rest is outside any Census-defined city or community.
What county is 20646 in?: 20646 is in Charles County.
What is the population of 20646?: About 21,400 people (±952), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 20,411.
What is the median household income in 20646?: $131,974 (±$10,208), compared with $103,678 for Maryland as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 20646?: 17 USPS carrier routes with 9,494 residential and 496 business mailboxes (9,990 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 20646?: The closest, measured center to center: 20677 (2.7 mi, Port Tobacco Village), 20675 (4.4 mi, Pomfret), 20611 (4.6 mi), 20695 (4.8 mi, Waldorf), 20693 (6.4 mi) and 20602 (7.1 mi, Waldorf).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.