Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — CITY/MD/ROCKVILLE

Rockville ZIP codes, Maryland

Rockville, MD has 8 ZIP codes, from 20847 to 20857, and area codes 240, 301 and 227. The largest are 20850, 20852 and 20853.

USPS city name
8 ZIP codes
Overlapping the city
3 more
Population
67,671
Area codes
240, 301, 227

NANPA lists no telephone rate centre for Rockville itself, so these are the area codes of the nearest one, Gaithersburg (0.0 miles). A town on an area-code boundary can differ from its neighbour.

Mail addressed to Rockville uses the ZIP codes above. 3 more ZIP codes cover part of the city but are addressed as somewhere else; they are listed separately below.

Rockville in numbers

About 67,671 people live in Rockville, in 26,976 households, the 11th-largest of Maryland's 527 census places. The median household income is $128,649 a year, 24% above the Maryland median of $103,678 (US: $80,734). The median owner-occupied home is valued at $682,300 (62% above the Maryland median), and median gross rent is $2,274 a month. The median age is 39.6; 65.6% of adults 25 and over hold a bachelor's degree or higher (43.4% across Maryland); the average commute takes 31 minutes.

Population67,671Rockville67,671
Households26,976Rockville26,976
Median age39.6Rockville39.6Maryland39.4US 38.9
Median household income$128,649Rockville$128,649Maryland$103,678US $80,734
Median home value$682,300Rockville$682,300Maryland$419,900US $332,700
Median gross rent$2,274Rockville$2,274Maryland$1,705US $1,413
Bachelor's degree or higher65.6%Rockville65.6%Maryland43.4%US 35.7%
Mean commute30.7 minRockville30.7 minMaryland31.1 minUS 26.4 min
Population density4,988 / sq miRockville4,988 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, for the census place Rockville city. Survey estimates carry margins of error, wider for small places. Sources and methods.

ZIP codes addressed as Rockville

ZIP codes with the USPS city name Rockville
ZIP City Type Population Median income Median home
20850 Rockville , MD Standard 50,353 $125,950 $714,400
20852 Rockville , MD Standard 48,180 $122,472 $665,200
20853 Rockville , MD Standard 31,851 $159,080 $631,900
20851 Rockville , MD Standard 14,946 $126,411 $568,900
20847 Rockville , MD No street area — — —
20848 Rockville , MD No street area — — —
20849 Rockville , MD No street area — — —
20857 Rockville , MD No street area — — —

Other ZIP codes overlapping Rockville

These ZIP codes cover part of Rockville but are addressed as somewhere else.

ZIP codes overlapping Rockville
ZIP City Type Population Median income Median home
20854 Potomac , MD Standard 50,498 $250,000+ $1,165,400
20855 Derwood , MD Standard 17,279 $149,110 $640,300
20877 Gaithersburg , MD Standard 38,546 $92,800 $474,800

Map of Rockville ZIP codes

2085020852208532085120847208482084920857

The ZIP codes of Rockville, MD, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Towns near Rockville

The nearest larger towns are Gaithersburg (69,825 people, 5.0 mi), Bethesda (69,397 people, 6.9 mi) and Germantown (90,719 people, 8.5 mi).

Towns near Rockville
TownPopulationDistance
Redland 18,665 3.4 mi
North Bethesda 49,677 3.8 mi
Aspen Hill 53,279 4.0 mi
North Potomac 23,922 4.5 mi
Leisure World 8,882 4.9 mi
Gaithersburg 69,825 5.0 mi
Potomac 45,902 5.3 mi
Travilah 11,721 5.4 mi
North Kensington 8,954 5.5 mi
Wheaton 52,926 5.7 mi
Glenmont 17,208 5.9 mi
Flower Hill 13,794 6.1 mi
Olney 35,797 6.2 mi
Layhill 5,497 6.2 mi

More nearby: every ZIP code in Montgomery County · Maryland ZIP codes

Cite this page

zipcodes.pro. “Rockville, MD ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/md/rockville

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