County ZIP codes · Maryland · FIPS 24031
Montgomery County, MD ZIP Codes
Montgomery County, Maryland has 81 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 53 residential and 28 for PO boxes or a single organization. 48 of the residential ones lie mainly in Montgomery County and 5 mainly in a neighboring county; 11 cross the county line. Median household income ranges from $80,768 in 20903 (Silver Spring) to $250,000 or more in 20854 (Potomac) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Montgomery County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
How different are its ZIP codes?
The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $112,134 and $177,523. One reports $250,000 or more, the Census top code.
They carry 34 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 53 residential ZIP codes in Montgomery County
48 ZIP codes lie mainly in Montgomery County; 5 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 20906 | Silver Spring | 70,595 | 5,544 | $98k | $456k | 100% |
| 20878 | Gaithersburg | 66,115 | 3,233 | $144k | $716k | 100% |
| 20874 | Germantown | 62,738 | 2,767 | $115k | $399k | 100% |
| 20904 | Silver Spring | 58,646 | 4,272 | $96k | $560k | 98% |
| 20902 | Silver Spring | 54,261 | 7,174 | $115k | $551k | 100% |
| 20854 | Potomac | 50,498 | 1,492 | $250k+ | $1.17M | 100% |
| 20850 | Rockville | 50,353 | 3,567 | $126k | $714k | 100% |
| 20852 | Rockville | 48,180 | 5,967 | $123k | $665k | 100% |
| 20910 | Silver Spring | 45,943 | 9,996 | $112k | $731k | 100% |
| 20877 | Gaithersburg | 38,546 | 6,842 | $93k | $475k | 100% |
| 20817 | Bethesda | 37,454 | 2,668 | $249k | $1.18M | 100% |
| 20901 | Silver Spring | 36,435 | 6,813 | $131k | $590k | 100% |
| 20886 | Montgomery Village | 34,718 | 8,466 | $99k | $387k | 100% |
| 20814 | Bethesda | 32,795 | 7,355 | $151k | $990k | 100% |
| 20853 | Rockville | 31,851 | 3,527 | $159k | $632k | 100% |
| 20815 | Chevy Chase | 30,505 | 5,666 | $195k | $1.29M | 100% |
| 20871 | Clarksburg | 30,182 | 1,319 | $178k | $669k | 94% |
| 20876 | Germantown | 26,406 | 2,433 | $120k | $487k | 100% |
| 20912 | Takoma Park | 25,749 | 9,611 | $84k | $699k | 90% |
| 20832 | Olney | 25,553 | 2,659 | $169k | $627k | 100% |
| 20879 | Gaithersburg | 25,264 | 2,932 | $112k | $468k | 100% |
| 20903 | Silver Spring | 24,815 | 7,277 | $81k | $486k | 95% |
| 20895 | Kensington | 19,184 | 4,709 | $174k | $782k | 100% |
| 20905 | Silver Spring | 19,004 | 1,612 | $160k | $657k | 100% |
| 20816 | Bethesda | 18,140 | 5,090 | $233k | $1.22M | 100% |
| 20855 | Derwood | 17,279 | 1,322 | $149k | $640k | 100% |
| 20866 | Burtonsville | 15,986 | 2,275 | $140k | $447k | 100% |
| 20851 | Rockville | 14,946 | 5,894 | $126k | $569k | 100% |
| 20872 | Damascus | 13,983 | 703 | $141k | $504k | 100% |
| 20882 | Gaithersburg | 13,751 | 364 | $184k | $737k | 100% |
| 20841 | Boyds | 9,969 | 367 | $185k | $783k | 100% |
| 20833 | Brookeville | 7,860 | 411 | $204k | $797k | 90% |
| 20837 | Poolesville | 6,699 | 166 | $174k | $772k | 100% |
| 20861 | Ashton | 2,890 | 558 | $163k | $853k | 100% |
| 20842 | Dickerson | 2,369 | 43 | $204k | $746k | 77% |
| 20860 | Sandy Spring | 2,035 | 564 | – | $654k | 100% |
| 20818 | Cabin John | 1,539 | 1,658 | $246k | $1.34M | 100% |
| 20896 | Garrett Park | 932 | 2,725 | $250k+ | $1.01M | 100% |
| 20889 | Bethesda | 584 | 1,497 | – | – | 100% |
| 20880 | Washington Grove | 577 | 1,728 | $135k | $613k | 100% |
| 20862 | Brinklow | 430 | 273 | $190k | $811k | 100% |
| 20838 | Barnesville | 306 | 327 | $250k+ | $776k | 100% |
| 20812 | Glen Echo | 276 | 1,559 | $214k | $1.16M | 100% |
| 20868 | Spencerville | 198 | 122 | $143k | $622k | 100% |
| 20839 | Beallsville | 158 | 52 | $160k | $950k | 100% |
| 20899 | Gaithersburg | 57 | 538 | $24k | – | 100% |
| 20892 | Bethesda | no residents | 0 | – | – | 100% |
| 20894 | Bethesda | no residents | 0 | – | – | 100% |
Partly in Montgomery County
| In this county | ||||||
|---|---|---|---|---|---|---|
| 20707 | Laurel | 37,278 | 2,948 | $108k | $423k | 6% |
| 21771 | Mount Airy | 33,031 | 369 | $157k | $556k | 4% |
| 20777 | Highland | 3,221 | 427 | $226k | $862k | 2% |
| 21797 | Woodbine | 8,643 | 198 | $189k | $736k | 1% |
| 20705 | Beltsville | 28,713 | 1,987 | $110k | $447k | 1% |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
11 ZIP codes of Montgomery County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Montgomery | Elsewhere |
|---|---|---|
| 20904 | 98% | Prince George's County2% |
| 20707 | 6% | Prince George's County94% |
| 21771 | 4% | Frederick County51%; Carroll County26%; Howard County18% |
| 20871 | 94% | Frederick County6% |
| 20705 | 1% | Prince George's County99% |
| 20912 | 90% | Prince George's County10% |
| 20903 | 95% | Prince George's County5% |
| 21797 | 1% | Howard County67%; Carroll County32% |
| 20833 | 90% | Howard County10% |
| 20777 | 2% | Howard County98% |
| 20842 | 77% | Frederick County23% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 20810 | Bethesda |
| 20811 | Bethesda |
| 20813 | Bethesda |
| 20824 | Bethesda |
| 20825 | Chevy Chase |
| 20827 | Bethesda |
| 20830 | Olney |
| 20847 | Rockville |
| 20848 | Rockville |
| 20849 | Rockville |
| 20857 | Rockville |
| 20859 | Potomac |
| 20875 | Germantown |
| 20883 | Gaithersburg |
| 20884 | Gaithersburg |
| 20885 | Gaithersburg |
| 20891 | Kensington |
| 20897 | Suburb Maryland Fac |
| 20898 | Gaithersburg |
| 20907 | Silver Spring |
| 20908 | Silver Spring |
| 20911 | Silver Spring |
| 20914 | Silver Spring |
| 20915 | Silver Spring |
| 20916 | Silver Spring |
| 20918 | Silver Spring |
| 20993 | Silver Spring |
| 20997 | Silver Spring |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Montgomery County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Montgomery County's ZIP codes use 4 prefixes: 207, 208, 209 and 217.
| Prefix | Sectional center | Here | All codes |
|---|---|---|---|
| 207 | Southern, MD (SCF 207) | 3 | 79 |
| 208 | Suburban, MD (SCF 208) | 59 | 59 |
| 209 | Suburban, MD (SCF 208) | 17 | 18 |
| 217 | Baltimore, MD (SCF 212) | 2 | 66 |
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.