County demographics · Massachusetts
Essex County, Massachusetts demographics
Essex County, Massachusetts (county FIPS 25009) has a median household income of $101,883 (±$1,515) and a total population of 813,054 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. 46 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 | 813,054 | none (controlled estimate) | B01003 |
| Median age | 41.2 years | ±0.2 years | B01002 |
| Households | 313,147 | ±1,080 | B11001 |
| Median household income (inflation-adjusted to the final ACS year) | $101,883 | ±$1,515 | B19013 |
| Median value of owner-occupied housing units | $619,100 | ±$3,976 | B25077 |
| Median gross rent | $1,756 | ±$23 | B25064 |
| Owner-occupied share of occupied housing units | 63.5% | none (derived from several estimates) | B25003 (derived) |
| Renter-occupied share of occupied housing units | 36.5% | none (derived from several estimates) | B25003 (derived) |
| High school graduate or higher (age 25+) | 90.1% | none (derived from several estimates) | B15003 (derived) |
| Bachelor's degree or higher (age 25+) | 43% | none (derived from several estimates) | B15003 (derived) |
| Share of people below the poverty level | 9.4% | none (derived from several estimates) | B17001 (derived) |
| Unemployment rate (civilian labor force) | 5.1% | 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 | 25009 |
| Land area | 492.51 sq mi |
| Water area | 335.98 sq mi |
| Population density | 1,651 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 |
|---|---|---|---|
| 01938 | 6.5% | 100% | Yes |
| 01810 | 6.2% | 100% | Yes |
| 01845 | 5.4% | 100% | Yes |
| 01930 | 5.3% | 100% | Yes |
| 01921 | 4.8% | 100% | Yes |
| 01844 | 4.5% | 100% | Yes |
| 01969 | 3.7% | 100% | Yes |
| 01960 | 3.3% | 100% | Yes |
| 01952 | 3.1% | 100% | Yes |
| 01951 | 2.9% | 100% | Yes |
| 01915 | 2.9% | 100% | Yes |
| 01982 | 2.9% | 100% | Yes |
| 01929 | 2.8% | 100% | Yes |
| 01830 | 2.8% | 100% | Yes |
| 01949 | 2.7% | 100% | Yes |
| 01985 | 2.7% | 100% | Yes |
| 01923 | 2.7% | 100% | Yes |
| 01833 | 2.6% | 100% | Yes |
| 01913 | 2.5% | 100% | Yes |
| 01983 | 2.4% | 100% | Yes |
| 01906 | 2.4% | 100% | Yes |
| 01832 | 2.3% | 100% | Yes |
| 01940 | 2% | 100% | Yes |
| 01944 | 1.9% | 100% | Yes |
| 01922 | 1.8% | 100% | Yes |
| 01834 | 1.8% | 100% | Yes |
| 01860 | 1.7% | 100% | Yes |
| 01950 | 1.7% | 100% | Yes |
| 01970 | 1.7% | 100% | Yes |
| 01835 | 1.6% | 100% | Yes |
| 01984 | 1.6% | 100% | Yes |
| 01966 | 1.4% | 100% | Yes |
| 01945 | 0.9% | 100% | Yes |
| 01904 | 0.9% | 100% | Yes |
| 01843 | 0.7% | 100% | Yes |
| 01905 | 0.6% | 100% | Yes |
| 01841 | 0.6% | 100% | Yes |
| 01907 | 0.6% | 100% | Yes |
| 01902 | 0.5% | 100% | Yes |
| 01908 | 0.2% | 100% | Yes |
| 01965 | 0.2% | 100% | Yes |
| 01840 | 0.1% | 100% | Yes |
| 01901 | 0.1% | 100% | Yes |
| 01876 | 0% | 0.8% | |
| 01826 | 0% | 0.6% | |
| 01937 | 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:009&in=state:25
- 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/25009" -H "X-API-Key: $OLYMPUS_API_KEY"get_us_demographics {"county_fips":"25009"}