| ZIP Codes: | 14 ZIP Codes (12 Standard, 2 PO Box, 0 Unique) [See All] |
| Area Codes: | 227 / 240 / 301 / 410 / 443 / 667 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:12:28 PM |
| Population: | 96,540 [See All] |
| FIPS: | 24009 |
| CBSA: | Lexington Park, MD |
| Land Area: | 254 sq mi |
| Water Area: | 36 sq mi |
| Coordinates: | 38.5326, -76.5620 |
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96,540 residents live across 14 ZIPs covering 254 sq mi, served by 14 distinct USPS-recognized cities.
Population moved from 91,877 to 96,540 from 2014 to 2024 — a +5.1% change. 10 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 20754 (Dunkirk, $167,371 median) and poorest ZIP 20629 (Dowell, $87,389) are 29.7 miles apart — a 1.9× income gap across local geography.
Median home values vary 1.9× across this county — from $333,500 in 20657 (Lusby) to $619,200 in 20688 (Solomons).
Density varies 9× across the county — from 217 people/sq mi in 20676 (Port Republic) to 1,871 in 20629 (Dowell).
Educational attainment ranges from 24.4% bachelor's+ in 20685 (Saint Leonard) to 49.9% in 20754 (Dunkirk) — the breadth of educational profiles across the area.
Within Maryland, this is the #15 most populous of 24 counties and ranks #5 for median household income with the #11 fastest decade growth .
On the national stage, Calvert County is ranks #44 for income .
Weighted by population, the typical household earns about $136,636 across the county — reflecting what a typical resident sees, not a simple ZIP average.
37.3% of adults age 25+ hold a bachelor's degree or higher (24,906 of 66,752 reporting).
12 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 |
|---|---|---|---|---|---|---|
| 20657 | Lusby | Standard | 20,699 | $115,748 | 35.0 | 5.4% |
| 20639 | Huntingtown | Standard | 15,544 | $161,422 | 46.0 | 5.9% |
| 20678 | Prince Frederick | Standard | 12,752 | $125,732 | 51.8 | 3.8% |
| 20732 | Chesapeake Beach | Standard | 10,722 | $140,304 | 9.1 | 8.7% |
| 20736 | Owings | Standard | 9,960 | $159,851 | 25.7 | 4.7% |
| 20754 | Dunkirk | Standard | 7,545 | $167,371 | 17.2 | 10.8% |
| 20685 | Saint Leonard | Standard | 6,866 | $119,135 | 28.8 | 8.8% |
| 20714 | North Beach | Standard | 4,525 | $91,099 | 2.5 | -1.6% |
| 20676 | Port Republic | Standard | 3,218 | $156,657 | 14.8 | -28.1% |
| 20689 | Sunderland | Standard | 1,809 | $161,833 | 6.3 | 25.6% |
| 20688 | Solomons | Standard | 1,290 | $102,950 | 3.9 | -17.3% |
| 20629 | Dowell | PO Box | 1,150 | $87,389 | 0.6 | 337.3% |
| 20615 | Broomes Island | Standard | 460 | — | 12.2 | 6.2% |
| 20610 | Barstow | PO Box | — | — | 0.0 | — |