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/GAITHERSBURG

Gaithersburg ZIP codes, Maryland

Gaithersburg, MD has 9 ZIP codes, from 20877 to 20899, and area codes 240, 301 and 227. The largest are 20878, 20877 and 20879.

USPS city name
9 ZIP codes
Overlapping the city
1 more
Population
69,825
Area codes
240, 301, 227

Mail addressed to Gaithersburg uses the ZIP codes above. 1 more ZIP code covers part of the city but is addressed as somewhere else; they are listed separately below.

Gaithersburg in numbers

About 69,825 people live in Gaithersburg, in 25,772 households, the 9th-largest of Maryland's 527 census places. The median household income is $112,467 a year, 8% above the Maryland median of $103,678 (US: $80,734). The median owner-occupied home is valued at $496,500 (18% above the Maryland median), and median gross rent is $2,058 a month. The median age is 37.8; 52.5% of adults 25 and over hold a bachelor's degree or higher (43.4% across Maryland); the average commute takes 29 minutes.

Population69,825Gaithersburg69,825
Households25,772Gaithersburg25,772
Median age37.8Gaithersburg37.8Maryland39.4US 38.9
Median household income$112,467Gaithersburg$112,467Maryland$103,678US $80,734
Median home value$496,500Gaithersburg$496,500Maryland$419,900US $332,700
Median gross rent$2,058Gaithersburg$2,058Maryland$1,705US $1,413
Bachelor's degree or higher52.5%Gaithersburg52.5%Maryland43.4%US 35.7%
Mean commute29.4 minGaithersburg29.4 minMaryland31.1 minUS 26.4 min
Population density6,754 / sq miGaithersburg6,754 / sq mi

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

ZIP codes addressed as Gaithersburg

ZIP codes with the USPS city name Gaithersburg
ZIP City Type Population Median income Median home
20878 Gaithersburg , MD Standard 66,115 $144,313 $715,800
20877 Gaithersburg , MD Standard 38,546 $92,800 $474,800
20879 Gaithersburg , MD Standard 25,264 $112,104 $468,100
20882 Gaithersburg , MD Standard 13,751 $184,136 $737,400
20883 Gaithersburg , MD No street area — — —
20884 Gaithersburg , MD No street area — — —
20885 Gaithersburg , MD No street area — — —
20898 Gaithersburg , MD No street area — — —
20899 Gaithersburg , MD Standard 57 $24,417 —

Other ZIP codes overlapping Gaithersburg

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

ZIP codes overlapping Gaithersburg
ZIP City Type Population Median income Median home
20886 Montgomery Village , MD Standard 34,718 $98,542 $386,500

Map of Gaithersburg ZIP codes

208782087720879208822088320884208852089820899

The ZIP codes of Gaithersburg, 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 Gaithersburg

The nearest larger towns are Germantown (90,719 people, 4.1 mi), Silver Spring (81,462 people, 14 mi) and Columbia (104,338 people, 18 mi).

Towns near Gaithersburg
TownPopulationDistance
Flower Hill 13,794 1.5 mi
Montgomery Village 34,110 2.8 mi
Redland 18,665 2.9 mi
Germantown 90,719 4.1 mi
North Potomac 23,922 4.3 mi
Rockville 67,671 5.0 mi
Clarksburg 30,487 6.4 mi
Olney 35,797 6.6 mi
Travilah 11,721 6.9 mi
Aspen Hill 53,279 7.2 mi
Leisure World 8,882 7.4 mi
Darnestown 7,051 7.5 mi
Damascus 17,640 8.5 mi
North Bethesda 49,677 8.7 mi

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

Cite this page

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

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