Frederick County, Maryland demographics
Frederick County, Maryland (county FIPS 24021) has a median household income of $122,002 (±$2,489) and a total population of 287,048 in the American Community Survey 5-year estimates for 2020-2024.
Margins of error are at the 90% confidence level. The figures describe 2020-2024 (dollars in 2024 dollars), not the present. 35 ZIP Code Tabulation Areas overlap the county (Census 2020).
Data as of Oct 22, 2026 (Olympus publication) · Markdown version
- Values are ACS 5-year estimates for 2020-2024 (dollars in 2024 dollars), not current figures.
- ZCTA-county overlaps come from the Census 2020 relationship file and use 2020 counties, by land area; Connecticut uses its legacy counties, not the planning regions in ACS 2022+.
ACS 5-year estimates, 2020-2024
Census American Community Survey 5-year estimates for 2020-2024, with 90% margins of error as published by the Census Bureau.
| Metric | Estimate | Margin of error (90%) | ACS table |
|---|---|---|---|
| Total population | 287,048 | none (controlled estimate) | B01003 |
| Median age | 39 years | ±0.2 years | B01002 |
| Households | 104,635 | ±535 | B11001 |
| Median household income (inflation-adjusted to the final ACS year) | $122,002 | ±$2,489 | B19013 |
| Median value of owner-occupied housing units | $464,600 | ±$4,368 | B25077 |
| Median gross rent | $1,774 | ±$37 | B25064 |
| Owner-occupied share of occupied housing units | 77% | none (derived from several estimates) | B25003 (derived) |
| Renter-occupied share of occupied housing units | 23% | none (derived from several estimates) | B25003 (derived) |
| High school graduate or higher (age 25+) | 93.4% | none (derived from several estimates) | B15003 (derived) |
| Bachelor's degree or higher (age 25+) | 45.8% | none (derived from several estimates) | B15003 (derived) |
| Share of people below the poverty level | 6% | none (derived from several estimates) | B17001 (derived) |
| Unemployment rate (civilian labor force) | 3.3% | none (derived from several estimates) | B23025 (derived) |
- Dollar values are in 2024 inflation-adjusted dollars.
- Percentages' margins of error are in percentage points (pp).
Geography
| Measure | Value |
|---|---|
| County FIPS | 24021 |
| Land area | 660.63 sq mi |
| Water area | 6.81 sq mi |
| Population density | 435 per sq mi of land |
| Geography vintage | 2024 Gazetteer |
ZIP codes (ZCTAs) in this county
ZCTAs that overlap the county in the Census 2020 ZCTA to county relationship file, largest share of the county's land first.
| ZCTA | Share of county land | Share of ZCTA land | County is the ZCTA's primary county |
|---|---|---|---|
| 21788 | 9.9% | 100% | Yes |
| 21771 | 7% | 51.4% | Yes |
| 21702 | 6.3% | 100% | Yes |
| 21769 | 6% | 99.3% | Yes |
| 21701 | 6% | 100% | Yes |
| 21773 | 5.5% | 100% | Yes |
| 21755 | 5.2% | 100% | Yes |
| 21703 | 4.8% | 100% | Yes |
| 21727 | 4.7% | 100% | Yes |
| 21710 | 4.4% | 100% | Yes |
| 21791 | 4.2% | 60.7% | Yes |
| 21704 | 4% | 100% | Yes |
| 21754 | 3.3% | 100% | Yes |
| 21793 | 3.2% | 100% | Yes |
| 21780 | 3.2% | 95.7% | Yes |
| 21778 | 2.8% | 100% | Yes |
| 21757 | 2.5% | 47.7% | |
| 21798 | 2.5% | 100% | Yes |
| 21758 | 2.4% | 50.3% | Yes |
| 21774 | 2.1% | 100% | Yes |
| 21783 | 2% | 27.1% | |
| 20842 | 1.9% | 22.5% | |
| 21770 | 1.7% | 100% | Yes |
| 21787 | 1.2% | 13% | |
| 21776 | 1.1% | 20.8% | |
| 21790 | 0.7% | 100% | Yes |
| 21716 | 0.4% | 100% | Yes |
| 20871 | 0.2% | 5.6% | |
| 21777 | 0.2% | 100% | Yes |
| 21717 | 0.1% | 100% | Yes |
| 21762 | 0.1% | 100% | Yes |
| 21714 | 0.1% | 100% | Yes |
| 21718 | 0.1% | 100% | Yes |
| 21719 | 0% | 2.6% | |
| 21705 | 0% | 100% | Yes |
Sources
- American Community Survey 5-year estimates (Census Data API) — U.S. Census Bureau. ACS 5-year 2020-2024 (release acs5-2024:county), source date 2025-09-02. https://api.census.gov/data/2024/acs/acs5?get=NAME,B01003_001E,B01003_001M,B01002_001E,B01002_001M,B11001_001E,B11001_001M,B19013_001E,B19013_001M,B25077_001E,B25077_001M,B25064_001E,B25064_001M,B25003_001E,B25003_002E,B25003_003E,B15003_001E,B15003_017E,B15003_018E,B15003_019E,B15003_020E,B15003_021E,B15003_022E,B15003_023E,B15003_024E,B15003_025E,B17001_001E,B17001_002E,B23025_003E,B23025_005E&for=county:021&in=state:24
- Published by Olympus on Oct 22, 2026.
- Source data: U.S. Census Bureau. Works of the U.S. government are not subject to copyright in the United States.
- This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
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The same figures, with provenance on every value, from the API (free API key, reference) or from an AI agent through the Olympus MCP server.
curl -s "https://api.olympus.new-odyssey.com/v1/geo-demographics/counties/24021" -H "X-API-Key: $OLYMPUS_API_KEY"get_us_demographics {"county_fips":"24021"}