Marathon County, Wisconsin demographics
Marathon County, Wisconsin (county FIPS 55073) has a median household income of $77,884 (±$2,218) and a total population of 138,403 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. 29 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 | 138,403 | none (controlled estimate) | B01003 |
| Median age | 41.3 years | ±0.3 years | B01002 |
| Households | 57,866 | ±405 | B11001 |
| Median household income (inflation-adjusted to the final ACS year) | $77,884 | ±$2,218 | B19013 |
| Median value of owner-occupied housing units | $219,600 | ±$3,992 | B25077 |
| Median gross rent | $999 | ±$28 | B25064 |
| Owner-occupied share of occupied housing units | 73.3% | none (derived from several estimates) | B25003 (derived) |
| Renter-occupied share of occupied housing units | 26.7% | none (derived from several estimates) | B25003 (derived) |
| High school graduate or higher (age 25+) | 93.3% | none (derived from several estimates) | B15003 (derived) |
| Bachelor's degree or higher (age 25+) | 28.1% | none (derived from several estimates) | B15003 (derived) |
| Share of people below the poverty level | 8.7% | none (derived from several estimates) | B17001 (derived) |
| Unemployment rate (civilian labor force) | 2.9% | 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 | 55073 |
| Land area | 1,545.24 sq mi |
| Water area | 31.1 sq mi |
| Population density | 90 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 |
|---|---|---|---|
| 54455 | 14.1% | 92.7% | Yes |
| 54411 | 11.6% | 94.3% | Yes |
| 54403 | 8.6% | 100% | Yes |
| 54426 | 6.9% | 100% | Yes |
| 54484 | 6.8% | 100% | Yes |
| 54448 | 5.9% | 100% | Yes |
| 54401 | 5.4% | 100% | Yes |
| 54440 | 5.3% | 100% | Yes |
| 54414 | 3.3% | 38.5% | |
| 54449 | 3.2% | 28.4% | |
| 54452 | 3% | 10.6% | |
| 54471 | 2.9% | 100% | Yes |
| 54408 | 2.8% | 86.8% | Yes |
| 54476 | 2.7% | 100% | Yes |
| 54421 | 2.5% | 55.1% | Yes |
| 54427 | 2.2% | 76% | Yes |
| 54479 | 2.2% | 43.8% | |
| 54499 | 2.1% | 29.7% | |
| 54412 | 1.6% | 35.2% | |
| 54405 | 1.5% | 75.3% | Yes |
| 54473 | 1.3% | 23.7% | |
| 54488 | 1.2% | 46.4% | |
| 54409 | 1.1% | 8.5% | |
| 54425 | 0.8% | 31.3% | |
| 54451 | 0.4% | 1.7% | |
| 54474 | 0.3% | 100% | Yes |
| 54480 | 0.2% | 7.8% | |
| 54417 | 0% | 100% | Yes |
| 54443 | 0% | 0.1% |
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:073&in=state:55
- 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/55073" -H "X-API-Key: $OLYMPUS_API_KEY"get_us_demographics {"county_fips":"55073"}