ZIP Code Tabulation Area · Maryland

ZIP Code 20851: Rockville, MD

ZIP Code 20851 (Rockville, Montgomery County, Maryland) has an estimated 14,946 residents in 5,155 households. The median household income is $126,411, the median home value is $568,900 and the median gross rent is $2,043/mo. Figures are U.S. Census Bureau American Community Survey 2020–2024 5-year estimates for the matching ZIP Code Tabulation Area.

American Community Survey 2020–2024 5-year estimates · Updated

Total population

14,946

Margin of error ±1,180

Median household income

$126,411

Margin of error ±$14,826

Median home value

$568,900

Margin of error ±$21,681

Median gross rent

$2,043/mo

Margin of error ±$155

Median age

38.6 yrs

Margin of error ±3.2 yrs

Mean travel time to work

31.8 min

Margin of error ±5.5 min

How ZIP 20851 compares with Maryland and the U.S.

State and national figures are the Census Bureau's own estimates for those areas from the same ACS release, not averages of ZIP codes.

Median age

ZIP 2085138.6 yrsMaryland39.4 yrsUnited States38.9 yrs

Median household income

ZIP 20851$126,411Maryland$103,678United States$80,734

Per capita income

ZIP 20851$51,567Maryland$52,979United States$44,673

Poverty rate

ZIP 208519.1%Maryland9.4%United States12.5%

Unemployment rate

ZIP 208513.0%Maryland4.9%United States5.2%

Bachelor's degree or higher

ZIP 2085146.2%Maryland43.4%United States35.7%

Median home value

ZIP 20851$568,900Maryland$419,900United States$332,700

Median gross rent

ZIP 20851$2,043/moMaryland$1,705/moUnited States$1,413/mo

Owner-occupied homes

ZIP 2085157.5%Maryland67.6%United States65.2%

Mean travel time to work

ZIP 2085131.8 minMaryland31.1 minUnited States26.4 min

Worked from home

ZIP 2085125.6%Maryland19.3%United States15.1%

All figures for ZIP 20851

Each estimate has a 90% margin of error: the true value is likely within that range. * marks estimates with a large margin of error (a coefficient of variation above 30%, or ±10 percentage points or more for rates).

ZIP 20851 — ACS 2020–2024 5-year estimates
MeasureZIP 20851Margin of errorMarylandUnited States
Total population14,946±1,1806,206,011334,922,499
Median age38.6 yrs±3.2 yrs39.4 yrs38.9 yrs
Households5,155±4032,362,928129,227,496
Median household income$126,411±$14,826$103,678$80,734
Per capita income$51,567±$4,607$52,979$44,673
Poverty rate9.1%±2.8 pts9.4%12.5%
Unemployment rate3.0%±1.3 pts4.9%5.2%
Bachelor's degree or higher46.2%±4.8 pts43.4%35.7%
Median home value$568,900±$21,681$419,900$332,700
Median gross rent$2,043/mo±$155$1,705/mo$1,413/mo
Owner-occupied homes57.5%±5.0 pts67.6%65.2%
Mean travel time to work31.8 min±5.5 min31.1 min26.4 min
Worked from home25.6%±5.7 pts19.3%15.1%

Race and Hispanic or Latino origin

Shares of the total population by the Census Bureau's race and Hispanic or Latino origin categories (table B03002), listed in the Census Bureau's order. People self-identify on the survey.

Population by race and Hispanic or Latino origin, ZIP 20851
GroupZIP 20851MarylandUnited States
White alone, not Hispanic or Latino28.5%46.6%57.4%
Black or African American alone, not Hispanic or Latino10.9%28.9%11.9%
American Indian and Alaska Native alone, not Hispanic or Latino0.0%0.1%0.5%
Asian alone, not Hispanic or Latino12.1%6.5%5.9%
Native Hawaiian and Other Pacific Islander alone, not Hispanic or Latino0.0%0.0%0.2%
Some other race alone, not Hispanic or Latino0.4%0.7%0.6%
Two or more races, not Hispanic or Latino4.0%4.6%4.3%
Hispanic or Latino (of any race)44.1%12.5%19.3%

Where ZIP 20851 is

State
Maryland
Main county
Montgomery County
Largest overlapping place
Rockville (81% of the ZIP's land area)
Land area
2.54 sq mi· about 5,884 people per sq mi

County and place names come from the Census Bureau's 2020 ZCTA relationship files. A ZIP code's mailing city, set by the U.S. Postal Service, can differ from these names.

Other ZIP codes in Montgomery County

20832 Olney, MD20833 Montgomery County, MD20837 Montgomery County, MD20838 Barnesville, MD20839 Montgomery County, MD20841 Montgomery County, MD20842 Montgomery County, MD20850 Rockville, MD20852 North Bethesda, MD20853 Aspen Hill, MD20854 Potomac, MD20855 Redland, MD20860 Ashton-Sandy Spring, MD20861 Ashton-Sandy Spring, MD20862 Ashton-Sandy Spring, MD20866 Burtonsville, MD20868 Burtonsville, MD20871 Clarksburg, MD20872 Damascus, MD20874 Darnestown, MD20876 Germantown, MD20877 Gaithersburg, MD20878 Gaithersburg, MD20879 Flower Hill, MD

See every ZIP code in Maryland, or compare ZIP 20851 with another ZIP code.

Census figures describe residents as a group and cannot tell you about any one home or street. For a specific address, check local government and housing records.

About ZIP codes and ZCTAs: the Census Bureau publishes statistics for ZIP Code Tabulation Areas, which approximate USPS ZIP code delivery areas. Learn how they differ.

Sources

  • U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, detailed tables B01003, B01002, B11001, B19013, B19301, B17001, B23025, B15003, B25077, B25064, B25003, B08013, B08303, B08301, B03002 — snapshot Oct 26, 2026.
  • U.S. Census Bureau, 2020 ZCTA5 relationship files (county and place).
  • Data: U.S. Census Bureau, American Community Survey 5-year estimates (detailed tables) and 2020 Census ZCTA relationship files. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau. These agencies do not endorse OpenZIP.