| ZIP Codes: | 21 ZIP Codes (19 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 410 / 443 / 667 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:12:28 PM |
| Population: | 262,768 [See All] |
| FIPS: | 24025 |
| CBSA: | Baltimore-Columbia-Towson, MD |
| Land Area: | 461 sq mi |
| Water Area: | 16 sq mi |
| Coordinates: | 39.5418, -76.3122 |
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262,768 residents live across 21 ZIPs covering 461 sq mi, served by 20 distinct USPS-recognized cities.
Population moved from 247,903 to 262,768 from 2014 to 2024 — a +6.0% change. 10 ZIPs gained residents, 10 lost.
The county's wealthiest ZIP 21047 (Fallston, $157,500 median) and poorest ZIP 21034 (Darlington, $78,047) are 14.1 miles apart — a 2.0× income gap across local geography.
Median home values vary 2.3× across this county — from $238,000 in 21040 (Edgewood) to $552,500 in 21047 (Fallston).
Density varies 56× across the county — from 49 people/sq mi in 21005 (Aberdeen Proving Ground) to 2,749 in 21014 (Bel Air).
Educational attainment ranges from 22.5% bachelor's+ in 21160 (Whiteford) to 55.2% in 21005 (Aberdeen Proving Ground) — the breadth of educational profiles across the area.
Within Maryland, this is the #8 most populous of 24 counties and ranks #10 for median household income with the #9 fastest decade growth .
Weighted by population, the typical household earns about $113,863 across the county — reflecting what a typical resident sees, not a simple ZIP average.
40.1% of adults age 25+ hold a bachelor's degree or higher (74,019 of 184,486 reporting).
19 Standard delivery, 2 PO Box only, 0 single-entity Unique ZIPs serve this county.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 21014 | Bel Air | Standard | 38,707 | $116,970 | 14.1 | 10.3% |
| 21009 | Abingdon | Standard | 33,679 | $121,660 | 12.5 | 13.8% |
| 21015 | Bel Air | Standard | 30,013 | $137,281 | 31.5 | 7.0% |
| 21001 | Aberdeen | Standard | 27,168 | $83,238 | 29.5 | 21.0% |
| 21040 | Edgewood | Standard | 24,960 | $81,704 | 11.5 | -0.3% |
| 21078 | Havre De Grace | Standard | 20,030 | $106,667 | 34.2 | 7.4% |
| 21050 | Forest Hill | Standard | 17,466 | $125,208 | 29.0 | -7.6% |
| 21085 | Joppa | Standard | 17,307 | $113,714 | 20.9 | 5.7% |
| 21047 | Fallston | Standard | 13,852 | $157,500 | 22.5 | 18.8% |
| 21084 | Jarrettsville | Standard | 7,070 | $121,509 | 23.9 | -3.9% |
| 21017 | Belcamp | Standard | 6,648 | $106,831 | 2.7 | -11.7% |
| 21154 | Street | Standard | 6,544 | $97,658 | 38.9 | -2.0% |
| 21161 | White Hall | Standard | 5,221 | $108,094 | 48.7 | -7.8% |
| 21132 | Pylesville | Standard | 3,160 | $132,288 | 22.4 | 24.0% |
| 21028 | Churchville | Standard | 3,103 | $137,586 | 14.1 | -15.0% |
| 21034 | Darlington | Standard | 2,846 | $78,047 | 29.9 | -16.1% |
| 21160 | Whiteford | Standard | 2,441 | $106,181 | 17.0 | 3.9% |
| 21005 | Aberdeen Proving Ground | Standard | 2,202 | $125,208 | 44.9 | -11.8% |
| 21010 | Gunpowder | Standard | 239 | $99,410 | 12.6 | 157.0% |
| 21130 | Perryman | PO Box | 112 | $17,336 | 0.6 | -69.2% |
| 21018 | Benson | PO Box | — | — | 0.0 | — |