First three digits · Maryland
ZIP Codes Starting with
58 ZIP codes start with 210, sorted at the Linthicum, MD (SCF 210) sectional center (USPS labeling list L005, effective October 1, 2026) in Maryland: 48 residential ZIP codes across 5 counties and 10 PO Box or single-organization codes (Census 2020 ZCTAs and GeoNames postal codes, October 2026).
What do the digits 210 mean?
The first digit, 2, is one of ten national areas (District of Columbia, Maryland, North Carolina, South Carolina, Virginia and West Virginia). The first three, 210, route mail to a sectional center: USPS labeling list L005 (effective October 1, 2026) sends letters for 210 to the Linthicum, MD (SCF 210) facility. The last two digits pick the delivery area. By residents, the largest town names among the 210 ZIP codes are Columbia, Glen Burnie, Ellicott City, Bel Air, Lutherville Timonium and Elkridge.
The same facility sorts 3 prefixes, 100 ZIP codes in all: 210, 211, 214.
Where are the 210 ZIP codes?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All ZIP codes starting with 210
| County | ||||||
|---|---|---|---|---|---|---|
| 21001 | Aberdeen | Harford County | 27,168 | 907 | $83k | $286k |
| 21005 | Aberdeen Proving Ground | Harford County | 2,202 | 66 | $125k | – |
| 21009 | Abingdon | Harford County | 33,679 | 2,954 | $122k | $357k |
| 21010 | Gunpowder | Harford County | 239 | 33 | $99k | – |
| 21012 | Arnold | Anne Arundel County | 22,570 | 2,308 | $139k | $564k |
| 21013 | Baldwin | Baltimore County | 5,610 | 374 | $171k | $572k |
| 21014 | Bel Air | Harford County | 38,707 | 2,781 | $117k | $430k |
| 21015 | Bel Air | Harford County | 30,013 | 960 | $137k | $443k |
| 21017 | Belcamp | Harford County | 6,648 | 2,483 | $107k | $258k |
| 21018 | Benson | Harford County | PO Box or unique | – | – | – |
| 21020 | Boring | Baltimore County | PO Box or unique | – | – | – |
| 21022 | Brooklandville | Baltimore County | PO Box or unique | – | – | – |
| 21023 | Butler | Baltimore County | 66 | 62 | $85k | $882k |
| 21027 | Chase | Baltimore County | PO Box or unique | – | – | – |
| 21028 | Churchville | Harford County | 3,103 | 241 | $138k | $512k |
| 21029 | Clarksville | Howard County | 13,607 | 804 | $244k | $912k |
| 21030 | Cockeysville | Baltimore County | 25,827 | 1,074 | $89k | $451k |
| 21031 | Hunt Valley | Baltimore County | 26 | 28 | – | – |
| 21032 | Crownsville | Anne Arundel County | 8,850 | 512 | $169k | $682k |
| 21034 | Darlington | Harford County | 2,846 | 107 | $78k | $402k |
| 21035 | Davidsonville | Anne Arundel County | 7,879 | 254 | $188k | $832k |
| 21036 | Dayton | Howard County | 2,569 | 411 | $218k | $881k |
| 21037 | Edgewater | Anne Arundel County | 20,854 | 1,241 | $146k | $560k |
| 21040 | Edgewood | Harford County | 24,960 | 2,543 | $82k | $238k |
| 21041 | Ellicott City | Howard County | PO Box or unique | – | – | – |
| 21042 | Ellicott City | Howard County | 43,327 | 1,171 | $190k | $706k |
| 21043 | Ellicott City | Howard County | 48,525 | 2,838 | $148k | $621k |
| 21044 | Columbia | Howard County | 44,114 | 3,711 | $135k | $567k |
| 21045 | Columbia | Howard County | 40,034 | 4,128 | $119k | $454k |
| 21046 | Columbia | Howard County | 15,608 | 1,998 | $128k | $480k |
| 21047 | Fallston | Harford County | 13,852 | 614 | $158k | $553k |
| 21048 | Finksburg | Carroll County | 10,481 | 385 | $132k | $459k |
| 21050 | Forest Hill | Harford County | 17,466 | 602 | $125k | $457k |
| 21051 | Fork | Baltimore County | 172 | 432 | $233k | $699k |
| 21052 | Fort Howard | Baltimore County | 409 | 1,017 | $77k | $293k |
| 21053 | Freeland | Baltimore County | 2,929 | 135 | $90k | $408k |
| 21054 | Gambrills | Anne Arundel County | 16,386 | 1,030 | $164k | $611k |
| 21056 | Gibson Island | Anne Arundel County | 291 | 211 | $250k+ | $2M+ |
| 21057 | Glen Arm | Baltimore County | 4,386 | 276 | $146k | $623k |
| 21060 | Glen Burnie | Anne Arundel County | 39,730 | 3,061 | $105k | $377k |
| 21061 | Glen Burnie | Anne Arundel County | 57,230 | 4,694 | $88k | $339k |
| 21062 | Glen Burnie | Anne Arundel County | PO Box or unique | – | – | – |
| 21065 | Hunt Valley | Baltimore County | PO Box or unique | – | – | – |
| 21071 | Glyndon | Baltimore County | 404 | 269 | $214k | $451k |
| 21074 | Hampstead | Carroll County | 14,777 | 392 | $109k | $378k |
| 21075 | Elkridge | Howard County | 37,363 | 2,682 | $135k | $455k |
| 21076 | Hanover | Anne Arundel County | 24,268 | 1,846 | $147k | $513k |
| 21077 | Harmans | Anne Arundel County | 63 | 144 | – | – |
| 21078 | Havre De Grace | Harford County | 20,030 | 665 | $107k | $386k |
| 21082 | Hydes | Baltimore County | 626 | 104 | $146k | $486k |
| 21084 | Jarrettsville | Harford County | 7,070 | 298 | $122k | $448k |
| 21085 | Joppa | Harford County | 17,307 | 912 | $114k | $349k |
| 21087 | Kingsville | Baltimore County | 5,537 | 378 | $129k | $534k |
| 21088 | Lineboro | Carroll County | PO Box or unique | – | – | – |
| 21090 | Linthicum Heights | Anne Arundel County | 10,652 | 1,604 | $138k | $410k |
| 21092 | Long Green | Baltimore County | PO Box or unique | – | – | – |
| 21093 | Lutherville Timonium | Baltimore County | 39,100 | 1,933 | $126k | $478k |
| 21094 | Lutherville Timonium | Baltimore County | PO Box or unique | – | – | – |
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; GeoNames postal codes (CC BY 4.0) for codes without a residential area.