Zip Code 21723 — Cooksville, MD
21723 is a ZIP Code associated with Cooksville, MD, located within Howard. 21723 ranks #19 out of 20 ZIP codes in Howard County by population (and #376 out of 477 in MD). The area supports an estimated population of 669 residents across Data Pending housing units, with a population density of 71.6 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (39.328250, -77.010560)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 21723 |
| Primary City | Cooksville |
| State / Province | MD |
| County | Howard |
| Total Population | 669 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 71.6 people/sq mi |
| Timezone | America/New_York |
How 21723 Compares
| Metric | ZIP 21723 | Howard County | MD State Average |
|---|
| Population | 669 | 335,512 (Total) | 6,205,597 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 71.6 /sq mi | -- | -- |
| County Pop Rank | #19 of 20 | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →