🇺🇸 United States ZIP Code

STANDARD

20850

Rockville

ZIP Code 20850 is a standard zip code serving Rockville, Rockville, Maryland (MD), in Montgomery County, United States. It has an estimated population of 46,340 with a median household income of $107,459. The area falls within the America/New_York timezone.

Median Household Income vs. National Average

Location

Country: 🇺🇸 United States
State / Province: Maryland (MD)
County: Montgomery
City: Rockville
Timezone: America/New_York

Coordinates

Latitude: 39.087000
Longitude: -77.168000

Geographic Details

Land Area: 14.10 mi²
Water Area: 0.08 mi²
Population Density: 3286.0 people per mi² (90th percentile)
Bounding Box: 39.120719°N, 39.058376°S, -77.122779°E, -77.252253°W

With 46,340 residents spread across 14.10 square miles, this area has a population density of 3286.0 people per square mile.

Demographics

46,340

Population

95th percentile

$107,459

Median Income

95th percentile

$536,700

Median Home Value

95th percentile

14.10 mi²

Land Area

The median household income in 20850 is $107,459, and the median home value is $536,700. This places the area in the top 25% nationally for household income.

Housing

19,085

Total Units

18,088

Occupied Units

94.8%

Occupancy Rate

Nearby ZIP Codes

Other zip codes in Rockville, MD.

20847

Rockville

20848

Rockville

20849

Rockville

20851

Rockville

20852

Rockville

20853

Rockville

20857

Rockville

Similar ZIP Codes in Maryland

ZIP codes with similar median household income in Maryland.

20814

Bethesda

$114,577

20905

Silver Spring

$116,806

21638

Grasonville

$94,180

20715

Bowie

$107,361

20764

Shady Side

$96,479

21152

Sparks Glencoe

$94,701

20866

Burtonsville

$93,828

20622

Charlotte Hall

$98,750

Frequently Asked Questions

What information is available for each ZIP code?

Each ZIP code page shows city, state, county, geographic coordinates, timezone, population, median household income, median home value, housing units, land area, population density, commute time, educational attainment, area codes, and ZIP code type (Standard, PO Box, or Unique).

What are the different types of ZIP codes?

There are three types of ZIP codes: Standard (residential and commercial delivery areas), PO Box (assigned to post office box sections), and Unique (assigned to a single high-volume address like a government agency or large company). Standard ZIP codes are the most common.

How often is ZIP code data updated?

ZIP code assignments are updated quarterly by the USPS. Demographic data comes from the US Census Bureau's American Community Survey (ACS), which releases new 5-year estimates annually. ZipFYI updates its data to reflect the latest available information.

What is population density and why does it matter?

Population density measures the number of people per square mile in a ZIP code area. It helps identify urban vs. rural areas, affects real estate values, impacts service availability, and is used in market analysis. Dense urban ZIP codes may have 50,000+ people per square mile.

How are ZIP code boundaries determined?

ZIP code boundaries are determined by the USPS based on mail delivery routes, not political or geographic boundaries. They follow carrier routes and may cross city, county, or even state lines. Boundaries can change when the USPS reorganizes delivery operations.

What does median household income tell me about a ZIP code?

Median household income is the middle value when all household incomes in a ZIP code are sorted. Half of households earn more and half earn less. It is a better indicator of typical earnings than average income, which can be skewed by very high or very low outliers.