County ZIP codes · Maryland · FIPS 24025
Harford County, MD ZIP Codes
Harford County, Maryland has 25 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 24 residential and 1 for PO boxes or a single organization. 20 of the residential ones lie mainly in Harford County and 4 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $78,047 in 21034 (Darlington) to $157,500 in 21047 (Fallston) (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
Where are the ZIP codes of Harford 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 $106,667 and $125,208.
They carry 23 postal town names.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).
All 24 residential ZIP codes in Harford County
20 ZIP codes lie mainly in Harford County; 4 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 21014 | Bel Air | 38,707 | 2,781 | $117k | $430k | 100% |
| 21009 | Abingdon | 33,679 | 2,954 | $122k | $357k | 100% |
| 21015 | Bel Air | 30,013 | 960 | $137k | $443k | 100% |
| 21001 | Aberdeen | 27,168 | 907 | $83k | $286k | 100% |
| 21040 | Edgewood | 24,960 | 2,543 | $82k | $238k | 100% |
| 21078 | Havre De Grace | 20,030 | 665 | $107k | $386k | 100% |
| 21050 | Forest Hill | 17,466 | 602 | $125k | $457k | 100% |
| 21085 | Joppa | 17,307 | 912 | $114k | $349k | 94% |
| 21047 | Fallston | 13,852 | 614 | $158k | $553k | 100% |
| 21084 | Jarrettsville | 7,070 | 298 | $122k | $448k | 100% |
| 21017 | Belcamp | 6,648 | 2,483 | $107k | $258k | 100% |
| 21154 | Street | 6,544 | 166 | $98k | $455k | 100% |
| 21161 | White Hall | 5,221 | 108 | $108k | $473k | 53% |
| 21132 | Pylesville | 3,160 | 141 | $132k | $486k | 100% |
| 21028 | Churchville | 3,103 | 241 | $138k | $512k | 100% |
| 21034 | Darlington | 2,846 | 107 | $78k | $402k | 100% |
| 21160 | Whiteford | 2,441 | 157 | $106k | $391k | 100% |
| 21005 | Aberdeen Proving Ground | 2,202 | 66 | $125k | – | 100% |
| 21010 | Gunpowder | 239 | 33 | $99k | – | 100% |
| 21130 | Perryman | 112 | 204 | $17k | – | 100% |
Partly in Harford County
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?
6 ZIP codes of Harford County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Harford | Elsewhere |
|---|---|---|
| 21085 | 94% | Baltimore County 6% |
| 21013 | 29% | Baltimore County 71% |
| 21087 | 10% | Baltimore County 90% |
| 21161 | 53% | Baltimore County 47% |
| 21111 | 23% | Baltimore County 77% |
| 21082 | 3% | Baltimore County 97% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 21018 | Benson |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Harford County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Harford County's ZIP codes use 2 prefixes: 210 and 211.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.